A64-217-lOm TEXAS AGRICULTURAL {EXPERIMENT smnou BULLETIN NO. 212 JANUARY, 1917 DIVISION OF CHEMISTRY \ The Availability 0f Phosphoric Acid in Rock Phosphate B. YOUNGBLOOD, DIRECTOR COLLEGE STATION, BRAZOS COUNTY, TEXAS AGRICULTURAL AND MECHANICAL COLLEGE OF TEXAS W. B. BIZZELL, A. M., D. C. L., President TEXAS AGRICULTURAL EXPERIMENT STATION BOARD OF DIRECTORS JOHN I. GUION, President, Ballinger. . _. . . . . . . . . . L. J. HART, Vice-President, San Antonio . . . . . . . . E.H . ASTIN, Bryan. . . ._ . . . . . . . . . . . . . . . . J. R. KUBENA, Fayetteville. . . . . . . . . . . . . A. B. Davidson, Cuero . . . . . . . . WiLL A. MiLLER JR., Amarillo. . . Joi-m C. DICKSON, Paris . . . . . . . . . H. A. BREIHAN, Bartlett . . . . . . . . . . . . . . . . . . . . . . F. M. LAW, Houston . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .Term expires 1911 Perm expires 1911 Term expires 191! . . . . . . . . . . . . . . . . . . . . . . . . . . .Term expires 1921 . . . . . . . . . . . . . . . . . . . . . . . . . . .Term expires 1921 Term expires 1921 . . . . . . . . . . . . . . . . . . . . . . . . . . .Term expires 192E Term expires 192i Termpxpires 192E MAIN STATION COMMITTEE LILQHART,’ Chairman WiLL A.'MiLLER, JR. GOVERNING BOARD, STATE SUBSTATIONS P. L. Downs, President, Temple. . . . . _. . . . . . . . . . CHARLE= RooAN, Vice-President, Austin . . . . . . . . W. P. IIoEBY, Beaumont . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Term'expires'1919 . . . . . . . . . . . . . . . . . . . . . . . . . . .Term;exp‘ireg 1923 . . . . . . . . . . . . . . . . . . . . . . . . . . .TermZexpires 1919 Term_expires_1921 STATION STAFF* ADMINISTRATION B. YOUNGBLOOD, M. S., Director A. B. CONNER, B. S., Vice Director CHAs. A. FELKER, Chief Clerk A. S. WARE, Secretary DIVISION OF VETERINARY SCIENCE M. FRANCIS, D. V. S., Veterinarian in Charge _ _ H. SCHMIDT, D. V. M., Veterinarian DIVISION OF CHEMISTRY _ _ G. S. FRAPs, _Ph. D., Chemist in Charge; W. T. P. SPROTT, B. S., Assistant Chemist H. LEBESON, M. S., Assistant Chemist CHARLES BUCHWALD, M. S., Assistant Chemist DIVISION OF HORTICULTURE _ _ H. NEss, M. S., Horticulturist in Charge W. S. Hotchkiss, Horticulturist DIVISION OF ANIMAL HUSBANDRY J. C. BURNS, B. S., Animal Husbandman, Feeding Investigations J. M. JONES, A. M., Animal Husbandman, Breeding Investigations DIVISION or ENTOMOLOGY _ _ F. B. Paddock, M. S., Entomologist in Charge; State Entomologist _ . J. REmHARn, B. S., Assistant Ento- mologist County Apiary Inspectors R. C. Abernathy, Ladonia; William Atch- ley, Mat 's; J. W. E. Basham, Barstow; Victor B er, Jourdanton: T._ W. Burle- son, Waxahachie: W. C. Collier, Gpliad; E. W. Cothran, Roxton; G. F. Davidson, Pleasanton; John Donegan, Seguin; A. R. Graham, Milano; J. B. Kiniz, Bates- ville; N. G. LeGear, Waco; R. A. Little, Pearsall; M. C. Stearns, Brady; S. _H. Stephens, Uvalde; M. B. Tally, Victoria; James W. Traylor, Enloe; R. E. Watson, Heidenheimer; W. H. White, Greenville; W. P. Bankston, Buffalo; F. C. Belt, Ysleta. DIVISION OF AGRONOMY _ A. B. CONNER, B. S., Agronomist in_Charge A. H. LEiDicH, B. S., Agronomist _ Louis WERMELSKIRCHEN, B. S., Agronomist DIVISION OF PLANT PATHOLOGY AND PHYSIOLOGY J. J. TAuBENHAus, Ph. D., Plant Patholo- gist and Physiologist in Charge _ A. D. JOHNSON, B. S., Graduate Assistant DIVISION OF POULTRY HUSBANDRY R. N. HARvEY, B. S., Paultryman in Charge DIVIEION OF PLANT BREEDING HUMEERT. Ph. D.. Plant Breeder in Charge J. S. IVIOGFORD. B. S., Graduate Assistant DIVISION OF DAIRYING J- E- HQPPPI‘. M. S., Dairgman in Charge DIVISION OF FEED CONTROL SERVICE JAMEs SULLIVAN. Executive Secretary . H. ROGERS, Inspector H- WOOD. Inspector . H. WoLTERs. Inspector . D. PEARCE. Inspector W. M. WICKES, Inspector SUBSTATION NO. 1: Beeville, Bee County E- E- BINFORD, B. S., Superintendent SUBSTATION NO. 2: Troiip, Smith County W. S. HOTCHKISS, Superintendent SUBSTATION N0. 3: Angleton, Brazorla County N. E. WINTERS, B. S., Superintendent SUBSTATION NO. 4: Beaumont, Jefferson County H. H. LAUDE, B. S., Superintendent SUBSTATION NO. 5: Temple, Bell County . T. KILLOUGH, B. S., Superintendent SUBSTATION No. 6: Denton, Denton County C. H. McDowELL, B. S., Superintendent SUBSTATION N0. 7: Spur, Dickens County R- E- DICKSON. B. S., Superintendent SUBSTATION N0. 8: Lubbock, Lubbock County R- E- KARPER. B. S., Superintendent SUBSTATION N0. 9: Pecos, Reeves County J. W. JACKSON, B. S., Superintendent SUBSTATION NO. 10: (Feeding and Breed- ing Substation) College Station, Brazos County E._R. SPENCE‘. B. S., Animal Husbandma n. in Charge of Farm G. F. JORDAN, B. S., Scientific Assistant SUBSTATION NO. 11: Nacogdoches, Naeog- doches County G. T. McNEss, Superintendent *'SUBSTATION N0. 12: Chillicothe, Harde- man County R. W. EDWARDS, B. S., Superintendent SUBSTATION NO. 14: Sonora, Sutton County E- M- PETERS. B. S., Acting Superintendent CLERICAL ASSISTANTS J. M. SCHAEDEL, Stenographer DAISY LEE, Registration Clerk W. F. CHRISTIAN, Stenographer ELIZABETH WALKER, Stenographer E. E. KILBORN, Stenographer *As of February 1, 1917. C. L. DURST, Mailing Clerk A. T. JACKSON, Coppist CARL ABELL, Scientific Assistant F. C. IVIARCJULIDI-IS, Stenographer **In cooperation with United States Department of Agriculture.- CONTENTS. . Page Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 ‘ Relation to Soil Chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 Use of Rock ‘Phosphate as a Fertilizer . . . . . . . . . . . . . . . . . . . . . . . .. 5 Experimental Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9 Phosphoric Acid Removed from Acid Phosphate . . . . . . . . . . . . . . . 13 Acid Phosphate Compared with Manure . . . . . . . . . . . . . . . . . . . .. 13 Acid Phosphate Compared with Rock Phosphate . . . . . . . . . . . . . . . 13 Effect of Manure on Rock Phosphate . . . . . . . . . . . _ . . . . . . . . . . . .. 14 Details of Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15 Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 39 Summary and Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 39 [Blank Page in Original Bulletin] THE AVAILABILITY OF PHOSPHORIC ACID IN ‘ RQCK PHOSPHATE. BY G. S. Fears, Ortnnrsr. Phosphate rock contains plIOSpllOIlC acid as tri-calcium phosphate. The phosphoric acid is taken up very slowly by plants, and generally, before being used as a fertilizer, phosphate rock is treated with sul- phuric acid tor the purpose of rendering the phosphoric acid more available; that is to say, more easily taken up by plants. The result- ing product is known as acid phosphate. RELATION TO SOIL CHEMISTRY. It was pointed out in Bulletin 126 of the Station, that the phosphoric acid, soluble in fifth-normal nitric acid, which we term the active phos- phoric acid, is probably represented by calcium phosphate, while that not soluble is probably in the form of iron and aluminum phosphates. From the results of the pot experiments given in that bulletin, it ap- pears that the needs of the soil for phosphate fertilizers are rela-tedto the quantity of active phosphoric acid present. While the active phosphoric acid may be present in other forms than calcium phosphate, it seems probable that most of it is present in this form. The study of the availability of the phosphoric acid of rock phosphate should thus throw some light upon the active phosphoric acid of the soil. This was one of the objects of the experiments here reported. — It was likewise pointed out in Bulletin No. 126 that organic matter, carbonate of lime, and other soil substances, might affect the quantity of phosphoric acid taken up from the soil. Studies along this line have been presented in Bulletin No. 1'78, and the study of the effect of organic matter upon the availability ot rock phosphate is reported in this bulletin. ‘USE OF ROCK PHOSPHATE AS A FERTILIZER. The studies here reported have also bearing upon the use of rock phosphate as a fertilizer. It has l.ong been known that the phosphoric acid of rock phosphate has only a low availability, and for this reason it is generally treated with sulphuric acid, as stated above. Of recent years, it has been claimed that decaying organic matter increases the availability of the phosphoric acid of rock phosphate, and its use in connection with green crops has been rather strenuously ad- vocated in some States. p For example, Hopkins, in Illinois Soil Report No. 9, April, 1915, states that “The abundant information thus far secured shows posi- tively that fine-ground natural rock phosphate can be used successfully 6 TEXAS AGRICULTURAL EXPERIMENT STATION. and very profitably, ‘and clearly indicates that this material will be the most economical form of phosphorus to use in all ordinary sys- tems of permanent, profitable soil improvement. The first application may well be one ton per acre, and subsequently about one-half ton per acre every four or five years should be applied, at least until the phos- phorus content of the plowed soil reaches 2,000 pounds per acre, which may require a total application of from three to five or six tons per acre of raw phosphate containing 12-}; per cent. of the element phos- phorus.” Two thousand pounds of phosphorus per acre is equivalent to 0.23 per cent. phosphoric acid, which should supply the soil Well with phos- phoric acid. Since phosphate rock, finelv ground, costs about $9.00 per ton in Texas (freight included), the application recommended would involve an investment of from $27.00 to $54.00 per acre. Such an application is, of course, practicable only by the man who owns the land having money to invest, and on land of high value. It is not practical on land of low value, with borrowed money which must he returned at the end of the crop season, or on land belonging to some oneelse who may reap the returns. Field experiments with rock phosphate by the experiment stations have been carried out with smaller quantities than those recommended above, and the results are not always favorable to rock phosphate. Mooers, in Tennessee Bulletin No. 90, 1910, makes the following statements: “According to this table, without liming, acid phosphate ranks first, bone meal second, and phosphate rock third in profitableness of returns, whether the cowpeas be turned under for green manure or removed for hay, but any one of the three may be used with profit. Under liming, which is necessary in order to get remunerative crops of clover on these soils, and is, therefore, fundamental to their most successful manage- ment, acid phosphate is easily first, bone meal may be used. with profit, but phosphate rock is liable to be used at a loss. “There is a somewhat popular opinion, especially among those who are interested in the sale of phosphate rock. that the rock increases appreciably in effectiveness with the lapse of time after incorporation with the soil. A comparison of the last crops harvested throughout ' the series gives little ground for this opinion. A consideration of the per cent. of decrease in yield from the first to the last crop of wheat, for each phosphated and unphosphated plot where the cowpeas were y turned under shows that the unphosphated plots, as an average of the first three series, declined most and that phosphate rock, hone meal, and acid phosphate followed in the order named. “Another argument advanced in favor of phosphate rock is that its cheapness will permit the makingof heavv applications, supnlving an excess of phosphoric acid over that removed by the crops, so that there will he a ‘permanent’ increase in the soil supplv. The results obtained here, however, demonstrate that under liming. which should be consid- AvAlL.11s111'rY or PHOSPHORIG Aorn IN Boon PHOSPHATE. 7 ered necessary, acid phosphate would without doubt be a more profit- able material than phosphate rock.” Keitt, South Ciarolina Bulletin No. 1'78, 1914, as a result of several experiments, states: ' “When applied alone or in combination with potash, the ground phos- phate rock has proved the most profitable the last two years. How- ever, when both nitrogen and potash were supplied, the results were in favor of the acid phosphate the last two years, as well as for the four-jyezlr period, in every case.” Elsewhere he states (page 9) that the reason for the poorer results with the acid phosphate the last two years, is due to the depletion of the nitrogen or potash content of the soil, or both, caused by the heavier crops of the first two years.” Brooks, Massachusetts Bulletin No. 162, 1915, concludes that, in his Massachusetts experiments the natural rock phosphates have produced much smaller average increases in crops than those of other classes. He states further: p "Relative Profits 0n the Difieren-t Phosphates-Jfhe results presented fully establish the facts of larger relative increases and in some instances superior quality of crops on the more soluble and available phosphates. Clearly, therefore, the use of such phosphates rather than the fine- ground natural rock phosphates is the part of wisdom, unless the cost of the latter is so much lower that they allow greater profit on their use than do the more soluble phosphates, in spite of the greater crop increases on the latter. The table gives the differences in value be- tween the average annual crop increases and the average cost for the different classes of phosphates. TABLE 1. MASSACHUSETTS. Gain or Loss Per Acre in Crop Values Compared with Cost of Phosphate. i Natural Basic slag Dissolved i mineral and ph0sphate5_ i phosphates. bone meals. l i Cost of phosphates . . . . . . . . . . . . . . . . . v . . . . . . . . . . . $3.67 $3.70 $3.24 Corn, average three crops, 1899, 191330914. i Grain,- average three crops, 1899, 1913, 1914 . . . . . . .1 —0.79 6.02 7.47 Stover, average three crops, 1899, 1913,"_1914 . . . . . .95 i 2.72 1 .95 Total, average three crops, 1899, 1913, 1914. . $ .16 i $8.74 i $9.42 Hay, average two crops, 1906, 1907. i Hay, average two crops, 1906, 1907 . . . . . . . . . . . . . . .1 $3. 19 $4.92 $6,015 Rowen, average two crops, 1906, 1907 . . . . . . . . . . . .i -—.79 1 .58 i 2. 10 Total, average two crops, 1906, 1907 . . . . . . . . .. $2.40 ' $5.50 $8.13 - Onions, average two crops, 1901, 1902 (sound). . . . . —15.30 71.80 68.36 Cabbage, average two crops 1903, 1908 . . . . . . . . . . . 58.91 126. 16 1.12.55 Oat hay, one crop, 1900 . . . . . . . . . . . . . . . . . . . . . . . . . 1 .39 7.95 9.12 . Hungarian hay, one crop, 1900 . . . . . . . . . . . . . . . . . . . 1.00 ——1 .33 -1 .52 Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2.39 i 6.62 7.60 Ensilage corn, one crop, 1904 . . . . . . . . . . . . . . . . . . . . —6.55 l 30.44 29.44 Soy beans, one crop, 1909. ' Beans, one crop, 1909 . . . . . . . . . .' . . . . . . . . . . . . . . . .. 2.31 i 12.27 11 .61 Straw, one crop, 1909 . . . . . . . . . . . . . . . . . . . . . . . . . . .87 1 2.38 2.33 Total, one crop, 1909 . . . . . . . . . . . . . . . . . . . . . .. s. 1s i 14.65 ‘ 13.94 8 ‘ TEXAS AGRICULTURAL EXPERIMENT Smrrox, TABLE 1.——MASSACHUSETTS—-Continued. Gain or Loss per Acre in Crop Values Compared With Cost of Phosphate. Natural Basic slag Dissolved mineral and phosphates. phosphates. bone meals. Potatoes, one crop, 1910. Merchantable . . . . . . . . . . ., . . . . . . . . . . . . . . . . . . . -—6.42 9.84 16.14 Small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.48 .50 .52 Total . . . . . . . . . . . . . . ‘ . . . . . . . . . . . . . . . . .. —5.94 10.34 16.66 Oats and alfalfa, one crop, 1911 . . . . . . . . . . . . . . . . . . .48 9.76 9.36 Alfalfa, one crop, 1911 . . . . . . . . . . . . . . . . . . . . . . . . .83 2.20 .66 Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1.31 11.96 10.02 Annual average . . . . . . . . . . . . . . . . . . . . . . .. 6.21 36.23 ’ 34.57 i “The results shown in this table are overwhelmingly conclusive on the point under discussion. The values of the crop increases in all "instances exceed the cost of phosphate many times more on the more soluble and available materials than on the natural rock phosphates. The latter afford, therefore, far lower profits on their use than the “former. "Uumatlative Efiect.—The advocates of the use ofthe- rock phosphates may at this point urge that while such phosphates are at first less effec- tive than the more soluble and quickly available materials they will tiltimatelly fully equal the latter. This series of experiments has now continued eighteen years, and it would seem that this result should have been already realized. This has not been the case. The more soluble phosphates, bone meal and slag, still annually exceed the rock phosphates greatly in their effect on crop yield. Such excess, so far as can be judged, is still as great as at any earlier period.” Wiancko and Conner, Indiana. Bulletin No. 187’, 1916, conclude: “In a general ‘summary of all the experiments of the Station during thirteen years, in which eighty-taro tests were made, it appears that: “The per-acre net profit has been over six times as great from acid phosphate as from rock phosphate. “’l‘he per-dollar invested profit has been over seven times as great from acid phosphate as from rock phosphate. ‘mhe value of the crop increase per pound of phosphorus applied has been tWentv-eight and one-third cents for the acid phosphate and three and one-half cents for the rock phosphate.” In the body of the bulletin they give the following: “As a result of the eighty-two tests it may be said most emphatically that it pays to use acid phosphate on the average Indiana soil under average conditions. Raw rock phosphate has also shown a profit, but the profit is much smaller. AVAILABILITY or Prrosrnonro A011) 11v Rocx Prrosrrrarn. 9 TABLE 2. INDIANA EXPERIMENTS. lummary of All Experiments in Which Acid Phosphate and Raw Rock Phosphate Have Been Compare d. _ , _ Phos- Value Cost of t Crops. Kind of Phosphate. Yield. Increase. phate. . of phos- Bu. Bu. pounds. increase‘ phates. Profit or loss . Zorn Acid phosphate . . . . .. ' 43.04 5.49 190.5 $2 95‘ $1.52 $1 43 36 tests. Raw rock . . . . . . . . . . . . 42.20 4.65 532.0 2 52t 1.86 None . . . . . . . . . . . . . . . 37.55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wheat ACld phosphate . . . . . . 15.28 4.31 190.5 4.63 1.52 3.11 33 tests. Raw rock . . . . . . . . . . .. 12.881 1.91 532.0 2.12 1.86l .26 None . . . . . . . . . . . . . .. 10.97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. _ Lbs. Legume hay ACld phosphate . . . . . . 2,998 320 190.5 1 60 1 5 .08 Qtests. Raw rock............ 2,773 95 532.0 . 1 sol —1.s9 None . . . . . . . . . . . . . .. 2,678 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..l . . . . . . .. _ - Bu. Bu. l Potatoes Acid phosphate . . . . . . 112.0 29 .4 500 14.70 4.00\ 10.70 4 tests. Raw rock . . . . . . . . . . .. 94.2 11.6 1 .000 5.80 3.50 2.30 N0_ne . . . . . . . . . . . . . .. 82.6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..l . . . . . . .. Average of Acid phosphate . . . . . . . . . . . . . . . . . . . . .. 205 $4.06 $1 .64‘, $2.42 82 test. 2 Raw rock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545 2.29 1.911 .38 ‘Value of increase includes value of corn stover and wheat straw. 2Average length of time tests have been running,- 3.47 years. EFFECT OF ORGANIC MATTER ON AVAILABILITY. Hartwell, in Rhode Island Bulletin No. 151, reviews the experiments bearing upon the eitect of decaying organic matter upon the availabil- ity of rock phosphate, and presents some pot experiments of his own. He concludes that in his experiments the cow manure had little or no effect upon the availability of the rock phosphate, whether applied at the time of planting or mixed and allowed to ferment several months. He concludes from his review of the literature that “the experimental evidence so far presented is not suflicient to prove that decaying or- ganic matter exerts any material effect upon the availability of the phosphoric acid of rock phosphate. Although it is not desired to con- clude as a result of the present pot experiment that manure may not, under some circumstances, increase the availability of floats, it appears, on the other hand, that further experimental evidence is necessary before it can be generally taught that the good results which may fol- low the application of floats and manure or even other organic matter, are due in any considerable degree to the action of one upon the other.” In Bulletin No. 1'78 of the Texas Station, it was shown that organic matter may increase to a small extent the quantity of phosphoric acid taken up from the soil in pot experiments. EXPERIMENTAL WORK. In the pot work here presented, the quantity of phosphoric acid used in acid phosphate was small in order that it should not, if possible, exceed the requirements of the plants. If an excess of phosphoric acid is used, the results would be more favorable to the less available phos- phates. Details of the experiments are presented on subsequent pages. Table 3 shows the percentages of added phosphoric acid recovered 10 Texas AGRICULTURAL EXPERIMENT STATION, in the various experiments. Thus, of the 0.2 gram available phosphoric acid added to soil 844, Series 4, 50.5 per cent. was recovered by the first crop, and 8.5 per cent. by the second. The figures refer to phos- phoric acid and do not represent relative weights of the crops. TABLE 3. PERCENTAGE OF ADDED PHOSPHORIC AGID RECOVERED. ACE R RE M Lab. AC or or or or N0. MAC P MR EX. 844 First crop, Series 4—R_ice . . . . . . . . . . . 50.5 . . . . . . . . 8.8 . . . . . . . . . . . . . . . . Second crop, Rice . . . . . . . . . . . 8.5 . . . . . . . . . . . . . . . . . . . . . . . . Total . . . . .. 59.0 . . . . . . .. 8.8 . . . . . . . . . . . . . . .. Percrop.... 29.5 . . . . . . .. 4.4...... . . . . . . . . . .. 852 First crop, Series 4—-Rice . . . . . . . . . . . 54.9 . . . . . . . . 15.2 . . . . . . . . . . . . . . . . Second crop, Rice . . . . . . . . . . .. 19.4 . . . . . . .. 8.5 . . . . . . . . . . . . . . .. Total . . . . .. 74.3 . . . . . . .. 23.8 . . . . . . .. ._. . . . . .. Percrop.... 37.2 . . . . . . .. 11.9 . . . . . . . . . . . . . . .. 844 First crop, Series 4—Corn . . . . . . . . . . 56.6 . . . . . . . . 4. 6 . . . . . . . . . . . . . . . . 852 First crop, Series 4——Corn . . . . . . . . . . 61.8 . . . . . . . . 17.6 . . . . . . . . . . . . . . . . 844 First crop, Series 11—-—Rice . . . . . . . . . . . 10.3 0 0 ‘0 47 Second crop, Rice . . . . . . . . . . . 20.5 ‘ 0 1.4 0 103 Third crop, Rice . . . . . . . . . . . 4.2 2.3 0 0 7 Total . . . . .. 35.0 2.3 1.4 0 157 _ Percrop.... 11.7 0.8 0.5 0 52 852 First crop, Series 11—Rice . . . . . . . . . . . 48.5 35.8 3.0 5 51 Second crop, Rice . . . . . . . . . 0 2.0 8.3 0 63 Third crop, Rice....' . . . . . .. 1.4 9.5 6.6 1.5 39 ' Total . . . . .. 49.9 47.3 17.9 6.5 153 Percrop.... 16.6 15.8 6.0 2.2 51 1956 First crop, Series 44—Mu tard, 1909. . 8.8 0 V5.7 0 12.6 Second crop, Corn, 1910.... .. 43.5 11.0 12.6 0 32.1 Third crop, Sorghum, 1910. . 20.8 14.3 0.6 0.7 19.4 Total . . . . .. 73.1 25.3 18.9 0.7 64.1 Per crop.... 24.7 8.4 6.3 0.2 21.4 First crop, Mustard, 19_11 . . 11.0 2.5 0 0 8. 7 Second crop, Corn, 1911 . . . .. 22.3 29.0 2.5 O 29.6 Third crop, Sorghum, 1911,. . 4.2 13.5 0.3 5.3 23 8 Total . . . . .. 37.5 45.0 2.8 5.3 62.1 .Percrop.... 12.5 15.0 0.9 1.8 20.7 2377 First crop, Series 44—Mustard, 1910. . 0.8 1 7 0.9 0.6 2.8 Second crop, Corn, 1910. . . .. 20.7 26.9 0 0.1 5.1 Third crop, Sorghum, 1910.. 10.1 6.7 0.2 0 8.7 Total . . . . .. 31.6 35 3 1.1 0.7‘ 16.6 Percrop.... 10.5 118 .4 0.2 5.5 First crop, Mustard, 1911.. 8.3 7.8 0.6 .3 6.6 Second crop Corn, 1911. . . .. 21.5 19.2 0 0 42.1 Third crop, Sorghum. 1911. . 16.8 0 0 0 27 2 Total . . . . .. 46.6 27.0 0.6 2.3 75 9 Per crop.... 15.5 9.0 0.2 0.8 25 3 2378 First crop, series 44,—Mustard. 1910. . 1 0 9.9 0 0 1.4 Second crop, Corn, 1910. . . .. 30.3 13.2 0 0 12.7 Third crop, Sorghum, 1910. . 6.4 9.3 0 0 7.5 Total . . . . .. 37.7 32.4 0 0 21 6 Percrop.... 12.6 10.8 0 0 7.2 First crop, Mustard 1911. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Second crop, Corn, 1911..... 16.3 17.1 7.0 1.9 31.6 Third crop, Sorghum, 1911. . 15.6 11.7 7.4 4.6 22.3 Total . . . . .. 31.9 28.8 14.4 6.5 53.9 Percrop.... 10.6 9.6 4.8 2.2 18. 1AVA1LABILPFY OF PHOSPHORIC A0111 IN RooK PHOSPHATE. 11 TABLE 3—Continued. PERCENTAGE OF ADDED PHOSPHORIC ACID RECOVERED, i ACE R ' RE M Lab. 1 i AC or or or or N0. X MAC P .MR EX. 1 l l I 33331First crop, Series 45—Sorghum, 1910. .1 16 5 21.4 0 5.7 0 ‘Second crop, Mustard, 1911. . i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lThird crop, Corn, 1911.....§ 6.0 3.1 1.7 5.1 6.0 T Total . . . . .. 22.5 24.5 1.7 10.8 8.0 i Percrop.... 7.5 8.2 .6 3.6 2.0 3653 First crop, Series 45—Sorghum, 1910. . 44.4 27.3 11 .3 11. 1 13.8 Second crop, Mustard, 1911 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iThird_crop,' Corn, 1911. . . .. 10.9 8.7 1 7.3 86.7 i Total . . . . . . 55.3 36.0 14.4 18.4 50.5 i Percrop.... 18.4 12.0 4.8 6.1 16.8 O 3652 First crop, Series 45—Sorghum, 1910. . 49.8 42. 8 .8 7. 1 1 .0 Second crop Mustard, 1911. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 . . . . . . . . . . [Third crop, Corn, 1911... . . 4.9 7.2 0 6.1 48.2 i Total . . . . .. 54.7 50.0 5.8 18.2 49.2 t Per crop.... 18.2 16.7 1.9 4.4 16.4 lFirst crop, _‘ -- i Corn, 1912.. . .. 21.1 28.9 0 9.1 41.9 3654iFirst crop, Series 46—Corn, 1911. . . . . 31.4 21 .6 0 1.5 0 Second crop, Sorghum, 1911.. 12.3 6.6 .3 6.0 6.6 Total . . . . .. 43.7 28.2 5.3 7.5 6.6 . Percrop....\ 21.9 14.1 2.7 3.8 3.3 8584181181 crop, Series 46—Corn, 1911. . . . .7 . . . . . . .. 15.6 0 . . . . . . .. 1.0 iSecond crop, J __ Sorghum, 1911 . . . . . . . . . . 22.5 0 . . . . . . . . 7.7 ‘ Total . . . . . . . . . . . . .. 88.1 0 . . . . . . .. 8.7 ,Percrop.... . . . . . . .. 19.1 0 . . . . . . .. 4.4 AE R i RE M Lab. . AC or or or or No MAC P MR _ Ex. 3656 First crop, Series 46-Corn, 1911. . . .. 21.2 36.9 5.8 6.8 3.6 Second crop, _ Sorghum, 1911.. 7.3 7.7 6.7 6.2 8.8 Total . . . . .. 28.5 44.6 12.5 13.0 12.4 Percrop.... 14.3 22.3 6.3 6.5 6.2 3975 First crop, Series 46—C0rn, 1911 . . . . . 32.9 22.3 13.4 2.3 i 0 Second crop, Sorghum, 1911.. 20.0 19.2 9.4 3.8 12.4 Total . . . . .. 52.9 41.5 22.8 6‘.l 12.4 Percrop.... 26.5 20.8 11.4 3.1 6.2 2409 First crop, Series 46——Corn, 1911. . . . . 10.2 15.4 7.1 8.5 0 Second crop, Sorghum, 1911.. 9.8 14.2 6.4 1.8 30.0 Total . . . . .. 20.0 29.6 13.5 10.3 30.0 Percrop.... 10.0 14.8 6.8 5.2 15.0 2829 First crop, Series 46——-Corn, 1911‘ . . . . . . . . . . . . . 0 . . . . . . . . 2:4 7.4 Second crop, Sorghum, 1911.. .. . . . . 9.2 . . . . . . .. 7.1 0 Total . . . . . . . . . . . . .. 9.2 . . . . . . .. 9.5 _ 7.4 Percrop.... . . . . . . .. 4.6 . . . . . . . .. 4.8 3.7 12 _ TEXAS AGRICULTURAL EXPERIMENT STATION. TABLE 3——Continued. PERCENTAGE OF ADDED PHOSPHORIC ACID RECOVERED l Lab. Ac R2 ‘ No. E R,E M E ‘ EH3 l ‘ l 4582 First crop, Series 47——Corn, 1911. . . . . 22.6 3.6‘ 13.1 0‘ 4.5 Second crop, Sorghum, 1911.. 0 1.8‘ 14.8 2.8‘ 0.3 Total . . . . .. 22.6 5.4‘ 27.9 2.8‘ 4.8 Percrop.1.. 11.3 2.7‘ 14.0 1.4‘ 2.4 4586 First crop, Series 47—Corn, 1911. . . .. 13.2 2.0, 24.1 6.4‘ 6.4 Second crop, Sorghum, 1911.. 16.5 11.7‘ 6.3‘ 11 12.2 Total . . . . .. . 29.7 13.7‘ 30.4‘ 18. ‘ 18.6 Percr0p.... 14.9 6.9‘ 15.2‘ v9.1‘ 9.3 4587 First crop, Series 47—Corn, 1911. . . .. 15.6 1.7‘ 23.7‘ 0‘ 2. 6 Second crop, Sorghum, 1911.. 4.6 0‘ 17.1‘ 1.0‘ 1.6 Total . . . . .. 20.2 1.7 45.8; 1.0‘ 4.2 Per crop.... 10.1 .9‘ 20.4‘ .5‘ 2.1 l. ’ L‘ Lab " Ac ‘ N0. ‘z Ac E R R,E ‘ M l - l f 2831‘First crop, Series 46——Corn, 1911 . . . . . 14.8 29.5 0 6.7‘ 0 ‘Second crop, Sorghum, 1911.. 13.2 16.7 3.6‘ 1.8‘ 14.3 Total . . . . .. 28.0 46.2 3.6 8.5‘ 14.3 Percrop.... 14.0 23.1 1.8 4.3‘ 7.2 2342 First crop, Series 48——C0rn, 1913. . . . . 15.2 29.0 . . . . . . . . 5.8‘ 12.6 Second crop, Sorghum, 1913. . 19.5 8.6 . . . . . . .. 3.8, 20.8 Third crop, Corn 1914.... 0.5 11.3 . . . . . . .. 7.9‘ 4.5 Fourth crop, Sorghum, 1914.. 4.3 0 . . . . . . . . 2.9 0 Total . . . . ..‘ 39.5 48.9 . . . . . . .. 20.4‘ 37.9 Percrop....‘ 9.9 12.2 . . . . . . .. 5.1‘ 9.5 2348First crop, Series 48——C0rn, 1913. . . . . 33.7 36.3 . . . . . . .. 12.4‘ 18.2 ‘Second crop, Sorghum, 1913.. 12.0 11.1 . . . . . . .. 9.5‘ 11.1 Third crop, Corn, 1914..... 8.9: 7.1 . . . . . . .. 4.1l 3.2 Fourth 0130p, A Sorghum, 1914. . 10.3‘ 0 . . . . . . . . 0‘ 10.2 Total . . . . . .. 64.91‘ 54.5 . . . . . . .. 26.0‘ 42.7 Percrop....‘ 16.2‘ 13.6 . . . . . . .. 6.5‘ 10.7 Lab. AC ACE ~ RE E No. 1 5095 First crop Series 48—Corn, 1913. . . . . 36.1 56.8 . . . . . . . . 29.7 39.2 Second crop, Sorghum, 1913.. 13.0 0 . . . . . . .. 1.9 19.1 Third crop, Corn, 1914. . . .. 10.1 9.4 . . . . . . .. .7 4.6 Fourth crop Sorghum, 1914. . 10.1 0 . . . . . . . . 0 7.5 Total . . . . .. 69.3 66.2 . . . . . . .. 40.3 70.4 Percrop.... 17.3 16.6 . . . . . . .. 10.1 17.6 5701 First crop, Series 48—Corn, 1913. . . .. 41.4 41.0 3.1 8.3 16.4 Second crop, Sorghum, 1913.. 7.2 15.5 2.8 2.2 15.3 Third crop, Corn, 1.8 O 2.9 2.5 1.4 Fourth crop, Sorghum, 1914. . 7. 1 0 6.9 0 8.2 Total . . . . .. 57.5 56.5 15.7 13.0 41.3 Percr0p.... 14.4 14.1 3.9 3.3 10.3 62885 First crop, Series 48—Corn, 1913 . . . . . 48.4 26.7 11.2 0 38.5 Second crop, Sorghum , 1913.. 15.0 21 .1 5.5 16.2 6.5 Third crop, Corn, 1914... f. 6.7 4.7 6.6 12.4 5.2 Fourth crop, Sorghum, 1914. . 3.2 0 6.2 6.2 4.6 Total . . . . .. 73.3 52.5 29.5 34.8 54.8 Percr0p.... 18.3 13.1 7.4 8.7 13.7 itvanianirrrv OF PHOSPHORIC A011) 11v RooK PHOSPHATE. 13 Phosphoric Acid Removed from Act-d .Phosph.ai‘e.—The percentages of- phosphoric acid recovered from acid phosphate vary from 20.0 to 74.3 per cent. The average recovery of phosphoric acid of acid phosphate for all crops, in 25 experiments, is 48.2, with a standard deviation for the individual tests of 0114.4 and a standard deviation from the average of :22. It is clear that one may reasonably count on an average recovery of 50 per cent of the phosphoric acid added in acid phosphate. When conditions are favorable, the greatest quantity of the phosphoric acid of acid phosphate is taken up by the first crop. This may vary from 40 to 6O per cent of the total. The average quantity of phosphoric acid. taken by the first crop is 30.6, compared with the average of all crops (22 tests) of 4713. Thus two-thirds is, on an average, taken up by the first crop. - Acid Phosphate Compared zu/ith Jlanurer-The average quality of phosphoric removed from acid phosphate in 22 tests (some with ma- nure), is 37.9 per cent., compared with 39.2 for the phosphoric acid from manure alone. We have either to conclude that the phosphoric acid of the manure or excrement 1s highly available to plants, or that the manure assisted in the assimilation of soil phosphates by plants. In Bulletin No. 1'78 we presented, evidence to show that manure or organic matter, to a slight extent, makes phosphoric acid of the crop more available. _ When acid phosphate alone is compared with acid phosphate and manure (18 tests) we find a recovery of 39.1 for the acid phosphate, 34:1 for the acid phosphate with manure after correction for the phos- phoric acid removed from the manure. We ascribe this decrease in assimilation of the phosphoric acid of acid phosphate to the fact that the supply of phosphoric acid in some cases exceeded the needs of the crop, and so the crop removed less. In 11 cases there are decreases, and in '7 there are increases of the phosphoric acid removed from the acid phosphate, when manure is present. - Acid Phosphate Compared with Roch Phosphate.—An examination of the table shows decided variations in the comparative recovery of phosphoric acid from rock phosphate. For example, 35.0 per cent. of the phosphoric acid of acid phosphate is recovered by three crops of rice on soil 844, and only 1.4 per cent. from rock phosphate; while from soil 852 with rice likewise, the recovery from acid phosphate is 74.3 and from rock phosphate 23.8. In the one case, the rock phos- phate is 20 times as available. There is evidently a decided difference in the availability in different soils. The average recovery for all experiments where a comparison is made (21) is 43.9 per cent. for acid phosphate with a standard de- viation of 11:15.7 tor individuals and ot :23 for the average; and 9.1 per cent. for rock phosphate, with a standard deviation for individ- uals of i737 and the average of 11.1. Thus the phosphoric acid in rock phosphate in these experiments has, on an average, 21 per cent. 0t the value of acid phosphate. As stated 14 TExAs AGRICULTURAL EXPERIMENT SrArioN. above, there are some soils in which the rock phosphate apparently has no value, and others where its value is high. There are 8 of the 21 tests in which the availability of the rock phosphate is 25 per cent. or more than that of the acid phosphate. _ Whether the relative values above given would apply to field condi- tions, and to larger applications of rock phosphate, requires further study. It does not follow, for example, that the application of five pounds of phosphoric acid in rock phosphate will produce the same effect as one pound phosphoric acid in acid phosphate for the reason that rock phosphate is only slightly soluble in the soil moisture and five times the application may really only increase slightly the amount of phosphoric acid presented to the roots. There may be a point at which increased applications of rock phosphate may have no effect upon the size of the crop, as it is possible that the phosphoric acid of rock phosphate may not enter the plant rapidly enough to produce the corresponding growth. That is to say, the rock phosphate is only slightly soluble and may not increase the concentration of the soil . moisture stitficiently to produce rapid growth, and further additions of rock phosphate might not increase the concentration of the phos- phoric acid in the soil moisture beyond a certain point. Assuming acid phosphate containing 16 per cent. available phos- phoric acid to cost $19.20 per ton, what would be the value of rock phosphate containing 28 per cent. phosphoric acid, if the phosphoric acid has one-fifth the value of that of acid phosphate? One-fifth of 28 is 5.6 per cent; so that the rock phosphate would be equivalent to acid phosphate containing 5.6 p-er cent. available phosphoric acid. At six cents per pound, which would be the cost of available phosphoric acid in 16 per cent. acid phosphate, at $19.20 per ton, the rock phos- phate would have a valuation of $6.72 per ton. Thus acid phosphate, on the basis of the above assumptions would give a larger immediate profit than rock phosphate at $7.00 a ton. The phosphoric acid of the rock phosphate would, of course, remain in the soil until utilized by the plants. ' These comparisons are made on the basis of several crops grown with the acid phosphate and the rock phosphate. It the first crops only . are considered, the showing is still more favorable to acid phosphate. _As stated above, the first crops removed 30.6 per cent. phosphoric acid from acid phosphate, while all the crops removed 47.3 per cent. With rock phosphate and manure (23), the first crop removed 5.3 per cent“. and all crops 11.9 per cent. Thus the phosphoric acid of the acid phosphate had nearly six times the value of the phosphoric acid of the rock phosphate for the first crops. . We have as yet not been able toitrace any connection between the chemical composition of the soils and the differences in the availability of the phosphoric acid of rock phosphate. Efiect 0f Zllcmure on Rock P7z.0sp~hate.—In 19 tests, rock phosphate alone averaged a recovery of 9.6 per cent. phosphoric acid, with a standard deviation of i8.6 for individuals and 11.3 for the average; AVAILABILITY or PHOSPHORIO Aorn IN R001; PHOSPHATE. 15 rhile rock phosphate with manure averaged 8.7 per cent., with a tandard deviation of 18.6 for individuals and 11.2 for the average, orrection being made for the phosphoric acid removed from the ma- ure alone. The addition of manure apparently had no effect upon the recovery f the phosphoric acid of the rock phosphate. This confirms the con- lusions of Hartwell, although it is apparently not in accord with the- act that manure or organic matter increases the phosphoric acid re- JOVQd by crops from some soils. However, there are some soils in rhich the manure apparently increases the removal of phosphoric acid rom rock phosphate, and then again, the phosphoric acid of soils is vidently not present as rock phosphate for the most part. In 32 tests, acid phosphate with manure averages 32.2 per cent. re- overy, compared with 10.2 per centffor rock phosphate and manure, orrection being made for the phosphoric acid removed from the manure- lone. "hese results show a slightly better recovery of the phosphoric cid of. rock phosphate, and a decidedly poorer recovery of that from cid phosphate, over those previously given. As already stated, it is mobable that in some of the tests the phosphoric acid supplied by the cid phosphate and manure exceeded the needs of the plants. ' We conclude that in these pot experiments, manure had, on an verage, little or no effect upon the assimilation of phosphoric acid of "ock phosphate by plants. DETAILS OF EXPERIMENTS. Tables 4 to 10, inclusive, contain -the detailed results of the work. Series 1,. Soils 852 and 844, with 5 kg. soil. Additions: 2 gms. )0t&SSl11II1 sulphate, 2 gms. ammonium nitrate; 0.2 gm. water-soluble 1nd reverted phosphoric acid in acid phosphate, No. 600 (K. (l); ).2 gm. phosphoric acid in phosphate rock No. 837. Planted (A) 5 grains corn‘ weighing 2.0-2.1 gms; (B) 10 grains rice weighing 0.34- ).36 gm. First crop, 1907. Second crop, rice planted, April 10, 1908, iarvested August 18, 1908, did very poorly, perhaps flooded too soon. Addition of 1 gm. each ammonium nitrate and sulphate of potash were" nade before planting, and 2, each on June 1. _ . Series 11. Soils 844 and 852 with 5 kg. soil. Additions: 1 gm. each sulphate of potash and nitrate of soda; 5 gms. excrement No. 917 (M), containing .0415 gm. P205; 0.2 gms. available phosphoric acid in acid phosphate No. 2480; 0.2 gm. phosphoric acid in phosphate rocks No. 857. Planted rice March 23, 1909, flooded May 4, harvested September 3, 1909. Second crop rice; additions 1 gm. each sulphate of potash and am- monium nitrate; 5 gms. excrement No. 917; 0.10 gm. available phos- phoric acid in acid phosphate No. 3194; 0.15 gm. phosphoric acid in phosphate rock No. 729. Planted July 12, 1910, flooded August 5. harvested November 22, 1910. 16 TEXAS AGRICULTURAL EXPERIMENT STATION. Third crop, rice; additions, 1 gm. each ammonium nitrate and sul- phate of potash. Planted April 7, harvested August 26, 1911. Series 41,. 1909. Soils 1956, 2377, 2378, with 10 kg. soil. Addi- tions; 2 gms. each sodium nitrate and potassium sulphate; 0.15 gm. available phosphoric acid in acid phosphate No. 2671 (A. 0.); 0.30 gm. total phosphoric acid in phosphate rock No. 729 (B), containing .0132 gm. phosphoric acid; 15 gms. excrement No. 904 (EX.). First crop; mustard, planted December 1, 1909, killed by freeze and harvested February 21-, 1910. _ Second crop; corn: planted April 5, harvested June 17, 1910. Ad- ditions of 2 gms. each sulphate of potash and nitrate of soda. Third crop; sorghum: added 1 gm. each potassium chloride and ammonium nitrate. Planted June 18, harvested September 13, 1910. Fourth (Erop; mustard: added 1 gm. each ammonium nitrate and sulphate of potash; 15 gms. excrement No. 3222 (Ex), containing .1125 gm. phosphoric acid; 0.15 gm. available phosphoric acid in acid phosphate No. 2671; 0.30 gm. total phosphoric acid in phosphate rock No. 729. Planted mustard October 17, 1910, harvested January 4, 1911. Fifth crop; corn: added 1 gm. each ammonium nitrate and potas- sium sulphate. Planted March 23, harvested June 2, 1911. Sixth crop; corn: added 1 gm. each ammonium nitrate and sul- phate of potash. Planted June 26, harvested September 4, 1911. Seventh crop; corn (1956 on 17): added 1 gm. each sulphate of potash and ammonium nitrate. Planted April 22, harvested June 25, 1912. TABLE 4. cRoPs IN SERIES 4. i l Per cent Lab. Crop Per cent Gm. Avcr- Gain recov- NO. _ Gm. P205 P205 age. over 0 ered, 844 First crop, rice, 1907, series 4 1-O . . . . . . . . . . . . . . . . . . .. 4.9 0.3 .0186 .0226 . . . . . . . . . . . . . . .. 2-O . . . . . . . . . . . . . . . . . . .. 8.6 0.3 .0266 . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . . . . . . . . . . 33.8 0.33 1116 1236 1010 5O 5 4-AC . . . . . . . . . . . . . . . . . 48.5 0.28 1357 . . . . . . . . . . . . . . . . . . . . . . . . 5-R . . . . . . . . . . . . . . . . . . . . 8.2 0.40 .0328 0403 0177 8 8 6-H . . . . . . . . . . . . . . . . . . .. 15.4 0.3 .0477 . . . . . . . . . . . . . . . . . . . . . . .. Second crop rice, 1908. , 1-O . . . . . . . . . . . . . . . . . . . . 1.2 0.25 .0030 .0030 . . . . . . . . . . . . . . .. 2-0 . . . . . . . . . . . . . . . . . . .. 1.1 0.26 .0029 . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . . . . . . . . . . 7.6 0.35 .0266 0201 0171 8 5 4-AC . . . . . . . . . . . . . . . . .. ' 3.4 0.40 0136 . . . . . . . . . . . . . . . . . . . . . . .. 5-R . . . . . . . . . . . . . . . . . . . . > 0.4 0.37 .0014 .0031 0001 6-H . . . . . . . . . . . . . . . . . . Ill 2.4] 0.21 .0048 . . . . . . . . . . . . . . . . . . . . . . .. AVAILABILITY OF PHOSPHORIC A011) IN B001; PHOSPHATE. 17 TABLE 4—Continued. CROPS IN SERIES 4. Lab. Crop Per cent Gm. Aver- Gain Per cent No. Gm. Grain. 2 5 P205 age. over 0 removed 852 First crop, rice, 1907, Series 4. 1-0 . . . . . . . . . . . . . . .. 10.9 . . . . . . .. 0.29 .0229 .0263 . . . . . . . . . . . . . . .. 2-0 . . . . . . . . . . .. 13.5 . . . . . . .. 0.22 .0297 . . . . . . . . . . . . . . . . . . . . . . .. 3-AC. 53.2 . .~ . . . . .. 0.26 . 1380 1362 1099 54.9 4-AC . . . . . . . . .. 54.1 . . . . . . . . 0.23 .1244 . . . . . . . . . . . . . . . . . . . . . . .. 5-R . . . . . . . . . . .. 27.3 . . . . . . . . 0.18 .0491 0568 .0305 15.3 6-H . . . . . . . . . . .. 30.7 . . . . . . .. 0.21 0644 . . . . . . . . . . . . . . . . . . . . . . .. Second crop, rice, Straw Grain 8. Gm. Gm. 1-O . . . . . . . . . . .. 13.5_ 0 0.21 .0277 0198 . . . . . . . . . . . . . . .. , 2-0 . . . . . . . . . . .. 5.4 0 0.22 .0119 . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . . 11 . 6 0 0.40 .0458 .0585 . 0387 19.4 4-AC . . . . . . . . .. 20.9 5.9 0.34 .0711 . . . . . . . . . . . . . . . . . . . . . . .. 5- . . . . . . . . . . .. 15.2 0.4 0.19 .0376 .0367 0169 8.5 6- . . . . . . . . . . .. 13.1 1.0 0.27 .0359 . . . . . . . . . . . . . . . . . . . . . . .. Lab. Crop Per cent Gm. Aver- Gain Per cent No. Gm 2 5 P205 age. over 0 removed- First crop corn, 1907, Series 4. 844 1-O . . . . . . . . . . . . . . . . . . . . 8.8 0.26 .0228 .0212 . . . . . . . . . . . . . . . . 2-O . . . . . . . . . . . . . . . . . . .. 7.3 0.27 .0197 . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . . . . . . . . . . 56.6 0.25 .1415 1345 1133 56.6 4-AC . . . . . . . . . . . . . . . . .. 58.0 0.22 .1276 . . . . . . . . . . . . . . . . . . . . . . . . 5-R . . . . . . . . . . . . . . . . . . . . 9.3 0.28 .0260 0304 .0092 4.6 6-R . . . . . . . . . . . . . . . . . . .. 13.9 0.25 0348 . . . . . . . . . . . . . . . . . . . . . . .. 852 1-0 . . . . . . . . . . . . . . . . . . .. 10.4 0.21 .0218 0172 . . . . . . . . . . . . . . . . 2-O . . . . . . . . . . . . . . . . . . .. 5.7 0.22 0125 . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . . . . . . . . . . 58.2 0.25 1455 1408 1236 61 .8 4-AC . . . . . . . . . . . . . . . . . . 52.3 0.26 1360 . . . . . . . . . . . . . . . . . . . . . . . . 5-R . . . . . . . . . . . . . . . . . . . . 22.9 0.23 0527 0525 .0353 17.6 6-R . . . . . . . . . . . . . . . . . . . . 22.8 0.23 0524 . . . . . . . . . . . . . . . . . . . . . . . . 18 'l‘EXAs AGRICULTURAL EXPERIMENT STATION. dfiwaamonn Eva 59G Abw m .0 Mucw MM EEM mONnM 4cm ma“ so woman 3m mach. M55 MEm MEouom co mmofiwMsuiwU mN wooo. jJTflTvmNo. mm. m8 mM 2M m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1042-0 0 0 . . . . . . . . .. .00M0. 0mm MAN v.0 2M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ZwMMZLm n. m.......~.0000 wNNom mN 5w N.M 2M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 . . . IMZ-v N6 . . . . . . .. 0NM0. Nmmo . mm. v.0 mM 2M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..U<-m 0 .. . . 0 . wmMo. MN. M0 m0 2M . . . . . . . . . . . . . . . . . , . . . . . . . . . . T . . . , . . 4 . . . . . . . IMMN . . 4 . . . . . . . . . . . . . . . . . . . . . . . iwwMo mm. m4» m0 2M .25: Q08 MKEH N.N $00. . . . . . . . . 15x00. um. wdM wh 0422M . . . . . . . . . . . . . . . . . . . . . . . T . , . . . . . . . . . . . . . IUM0 0 0 . . . . . memo. mm. 04M 0.N ~MM>M2M . . . . . . . . . . . . . . 4 . 4 . . . . . . . . . . , . . . . . . . . . . . ZIMMMZ .m0M fiflflTiMmwo. 0ww0. MN. mmMm 0.0M M>M2M III.WI......................I...TEmmM24. mfoN . . .. 300. mvwo wN. N 0M N6 U<2M . . . . . . . . . . . . . . . . . . . . . . . . . T . T . . . . . . .0410 MiM . . . . . . . . .. wvoo. R00. wM. mé 0 wMZM . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . IZMN . . . . . . . . . . . . . . . . . . . . . . . . . . . . lmNoo. 0M wM 0 2M .650 25 268w 0 0 . . . . . . . . .. 030. 0N0 NRM 0 UM2M . . . . . . . , . . . . . . . . . . 4 . . . . . . . . 4 T . . . . . . . . . . 1042-0 . 0 0 . . . . . . . . .. wmNo. mN.0 m.0M M.M MMM>MZM . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . ZmMM>Tm o.§¢ 1 - .2 ¢ . . - n - - n - - n n . . . - o.” i . 4 . . . . - . - . . - .DoNm .5“ uoz 0am m.@% . . . . . . . . . §.@ . . . . . . . . . . . . . . . . . . . . . . . . . . .mpufi%fl .E® o . . . . - - . - 0 ¢ o %-$ £.o . . . . . . . . . . . . . . . . - - . - - . . ' . . . - - O .m law N-ollmmlfl . . . . . . . . . . . . . . . . . . . . . . . . . . . . lwwNo. :0 0.3 m.M 2M .32“: 8E MM fiiww .56 EE 6962.20“ mM ~o>o O .8>o mOmnM mOflnM dEU .223: M56 8AM EwU cMmU .50 Mame 3m 3PM 3PM dQoMMMuMJM 000M .MM mmEam ZM mmomo .m mania 3% dz .63 19 AVAILABILITY OF PHOSPHORIG A011) IN ROCK PHOSPHATE. m0 wwmo. . . . . . . . . .. h0n0 . . . . . . . . .. 0w. 0Q 0m: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IU/Q/Th mA E00. . . . . . . . . Imhmo. . . . . . . . . .. 7m. w; m 0~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMw/Tw 0.0m . . . . . . . . .. ommo. flmm0. . . . . . . . . 10m. mfi m0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12$ wé . . . . . . . . .. Q00. mvoo. mm. 0 h; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 . . . . . . . 2041M 0.0 . . . . . . 0mm0. . 3N0. . . . . . . . . .. mm. 0.0 7h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . . . . . . . . . . ZMTN . . . . . . . . . . . . . . . . . . . . . . . . . . I500. 0 0.0 28c .86 Bu? 0d wmoo. . . . . . . . . .. mQwo .. . . . . . . 1mm. md. wmflm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1042-0 0 0 . . . . . . . . Zvwwo. .. . . . . . . 10m. 3m. w m; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . . . . . . Zflw/Tm m0 . . . . . . . . .. mmm0 mmh0. . . . . . . . 1mm. m.m 70m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A>Tv 0 . . . . . . . . .. 0 005. . . . . . . . 10m. m0 0h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.4fm m.w . . . . . . . . . .. ommo wowo. . . . . . . . 10m. 7H mql . . . . . . . . . . . . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . . . ZE-m . . . . . . . . . . . . . . . . . . . . . . . . . . . Iago. m0 MW: A053 no.6 vacuum whm mfih0. . . . . . . 1:2. v90 0m. 0h wfiw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....U<§|0 0b mwoo. . . . . . . . . .. @000. 0Y0 I. 70 9mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMQ/Tm. o-?n - a . - - - Q i! N?- m-m . . . . . . . - . . - . - - - . . . . . . v - ~ . . . . . . . . . . . . .-@Ewm Elq mfwv . 0hm0. Nmmw. 00.0 wm. T0 vgmv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . . . . . . . . IU<|m .m $00. . 130m wflio 0w. m.m whm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ifl|m . . . . . . . . . . ...Nwm0 3.0 00. 0b Thm .3 mviww .003 03E fiwumrwovou Am ._v>o .0 .~o>o m mm diam: ¢fimbw avg: AEU 231mm EmU EwU dEU “Owl “Gum 3S» REL . 25o 5m ~56 Sm 002 .: muimum w: MHQMO ._:.====¢o|» aanfip mmw .02 .83 20 TEXAS AGRICULTURAL EXPERIMENT STATION, TABLE 6. CROPS IN SERIES 44. I I ‘ I _ _ Per cent Lab. Mustard iPer cent} v Gms. Aver- Gain Gain recov- No. 1909. i P2 5 P205 age. over O. over E. ered. » i 1956 1-KN . . . . . . . .. .5‘ .51‘ .0026 0033 . . . . . . . . . . . . . . . .' . . . . . . .. 2-KN . . . . . . . .. 1.0 .41j .0041 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-KNAC . . . . .. 4.2‘ .42! .0176 0135 0132 . . . . . . Ill‘ 8.8 4-KNAC . . . . .. 2.0 .47‘ .0094 . . . . . . . . . . . . . . . . . . . . . . ..‘> . . . . . . . . 5-KNP (hos) 3.51 .83 .0290 0204 0171 . . . . . . . . 5 7 6-KNP (hos) 2.0: .59} .0118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-KNEX . . . . .. 4.0 611 .0244 0300 0167] . . . . . . .. 12 6 8-KNEX . . . . .. 5.41 651 .0351 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-KNACEX 4.3; I .0310 0303 . . . . . . . . 0003 0 10-KNACEX 3.51 85 .0297 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-KNPEX. . . . . 4.2; 71 .0298 0244 . . . . . . .. 0000 0 12-KNPEX..... 2.7; 73‘ .0197 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Per cent Lab. Corn Per cent Gms. Aver- Gain Gain Recov- No. 1910. P205 P205 age. over O. over E. ered. Second crop, Series 44 1956 1-O . . . . . . . . . . . 25.5 28 .0714 0965 . . . . . . . . . . . . . . . .’ . . . . . . . . " 2-0; . . . . . . . . .. 52.5 24 .1216 . . . . . . . . . . . . . . . . . . . . ..l . . . . . . .. 3-AC . . . . . . . . . 55.0 26 . 1430 1618 0653 . . . . . . . . 43 5 4-AC . . . . . . . . . 64.5 28 .1806 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -P . . . . . . . . . .. 51.5 27 . 1390 1343 0378 . . . . . . .. 12 6 6—P . . . . . . . . . .. 48.0 27 .1296 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 53.0 28 . 1484 1390 0425 . . . . . . . . 32 1 8-Ex . . . . . . . . . . 54.0 24 .1296 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-AcEx. 51.0 30 .1530 1555 . . . . . . .. 0165 11 0 IO-ACEx . . . . . . . 58.5 27 . 1579 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx . . . . . . .. 61 .2 22 .1346 .1379 . . . . . . .. 0 0 12-PEx . . . . . . . .. 56.5 25 .1412 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ' _ Per cent. Lab. Sorghum Per cent Gms. Aver- Gain Gain recov- No. 1910. P2 5 PQOS age. ‘over O. over E ered Third crop, Series 44. ] t 1956 -O . . . . . . . . . .. 56.9 28 .1593 0961 . . . . . . . . . . . . . . . .1 . . . . . . .. 2-O . . . . . . . . . .. 14.9 22 .0328 . . . . . . . . . . . . . . . . . . . . . . . .1 . . . . . . .. 3-AC . . . . . . . . . 56.0 23 .1288 1273 0312 . . . . . . . 20 8 4-AC . . . . . . . . . 54.7 23 . 1258 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 49.2 18 .0885 0978 0017 . . . . . . . . 0 6 6-P . . . . . . . . . .. 53.5 20 .1070 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . .. 60.1 21 .1262 1218 0257 . . . . . . .. 19 4 8-Ex . . . . . . . . .. 58.7 20 .1174 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-ACEx . . . . . . . 61.4 24 .1474 1433 . . . . . . . . 0215 14 3 10-AcEx . . . . . . . . 55.7 25 .1392 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx. .. 57.3 21 .1203 1239 . . . . . . . . 0021 0 7 12-PEx...... 55.4 23 .1271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. _ Per cent Lab. Mustard Per cent Gms. Aver- Gain Gain recov- No. 1909. P2 5 P205 age. over O. over E. ered. Fourth crop, Series 44 1 1956 1-0 . . . . . . . . . .. 2.7 .50 .0135 0260 . . . . . . . . . . . . . . . . . . . . . . . . 2-0 . . . . . . . . . .. 7.7 .50 .0385 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC* . . . . . . . .. 7.4 .50 .0370 .0425 0165 . . . . . . .. 11 0 4-AC . . . . . . . . . 9.6 .50 .0480 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 1 .5 .50 .0075 .0100 0 . . . . . . . . 0 6-P . . . . . . . . . .. 2.5 .50 .0125 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 7.5 .50 .0375 0358 0098 . . . . . . . . 8 7 8-Ex . . . . . . . . . . 6.8 .50 .0340 _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 6.6 .50 .0330 .0395 . . . . . . . . 0037 2 5 10-ACEx . . . . . . . 9.2 .50 .0460 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx. 4.2 .50 .0210 0255 . . . . . . . . . . . . . . . . 12 PEx . . . . . . .. 6.0 .50 .0300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. *New additions of P, Ex, and AC, Ex—.1125 gm. P205 N0. 3222. Calculations based on new additions only. AVAILABILITY 0F PHOSPHORIC ACID IN R001: PHOSPHATE. 21 TABLE 6—-Continued. CROPS IN SERIES 44. “ _ Per cent .ab. Corn Per cent. Gms. Aver- Gain Gain Recov- Jo. 1910. 2 5. P; 5 age. over O. over E ered. Fifth crop, Series 44. 956 1-0 . . . . . . . . . . . 12.0 .30 . 0360 . 0546 . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . .. 43.0 .17 .073 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 36.6 .24 .0878 .0887 .0341 . . . . . . . . 22.3 4-AC . . . . . . . . . 40. 7 .22 .0895 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P* . . . . . . . . . . 20.4 .22 .0449 0620 .0074 . . . . . . . . 2.5 6-P . . . . . . . . . . . 31 .6 .25 0790 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 41.8 .21 .0878 .0879 .0333 . . . . . . . . 29.6 8-Ex . . . . . . . , . . . 40.0 . 22 0880 . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . . . . 9-AcEx . . . . . . . . 42.2 .32 1350 . 1314 . . . . . . . . .0435 29.0 IO-ACEX . . . . . . . 42.6 .30 .1278 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx 29.5 .29 .0855 .0841 . . . . . . . . 0 0 12-PEx . . . . . . . . . 39.4 .21 .0827 . . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . *If No. 5 excluded, availability of P—8.1. _ _ Per cent .ab. Sorghum Per cent Gms. Aver- Gain Gain recov- \Io. 1910. , 5. P305. age over O over E ered. Sixth crop. Series 44. _ [956 1-O . . . . . . . . . .. 2.5 .46 .0115 0170 . . . . . . . . . . . . . . . . . . . . . . .. 2-0 . . . . . . . . . . . 7.0 .32 .0224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC . . . . . . . . . 4.4 .66 .0290 .0233 .0063 . . . . . . . . 4.2 AC . . . . . . . .. 3.3 .53 .0175 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-P* . . . . . . . . . . 0.9 .62 .0056 0180 .0010 . . . . . . . . 0.3 6-P . . . . . . . . . .. 8.7 .35 .0304 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 15.4 .32 .0493 .0438 .0268 . . . . . . . . 23.8 8-Ex . . . . . . . . . . 16.6 .23 .0382 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . .. 10.2 .50 .0510 .0640 . . . . . . . . .0202 13.5 IO-ACEx . . . . . . . 20.8 .37 .0769 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx . . . . . . . . . 16.3 .35 .0570 .0596 . . . . . . .. 0158 5.3 12-PEx 21 .4 .29 .0621 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *If N0. 5 excluded, availability of r0ck——6.3. _ Per cent Lab. Corn Per cent Gms. Aver- Gain Galn Recov- No. 1910. P205. P2 5 age. over O. over E. ered. Sezinth crop, Series 1956 1-O . . . . . . . . . . . 11.2 .19 .0213 .0267 . . . . . . . . . . . . . . . . . . . . . . .. 3-0 . . . . . . . . . .. 18.9 .17 .0321 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 15.4 .18 .0277 .0399 0132 . . . . . . .. 8.8 4-AC . . . . . . . . . 28.9 .18 0520 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-P . . . . . . . . . . . 10.3 .20‘ .0206 .0252 . . . . . . . . . . . . . . . . 0 6-P . . . . . . . . . . . 16.5 .18 .0297 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . 24.9 . 18 .0488 .0376 0109 . . . . . . . . 9.7 8-Ex . . . . . . . . .. 16.9 . 18 .0304 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Q-ACEX . . . . . . . 39.2 .21 .0823 .0865 . . . . . . . . .0489 32.6 IO-ACEX . . . . . . . 41 .2 .22 . 0906 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx . . . . . . . .. 36.4 .20‘. 728, 551 . . . . . . .. 0175 5.8 12-PEx 20.8 .18; 0374’ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *If N0. 12 excluded, availability of P (with Ex) is 11.4. 22 TEXAS AGRICULTURAL EXPERIMENT STATION. TABLE 6—Continued. CROPS IN SERIES 44. W _ _ Per ce Lab. Mustard Per cent Gms. Aver- Gain ' Gain recov No. 1909. P205 P205 age. over O. over E. ered. First crop, Series 44. 2377 1-O . . . . . . . . . . . , 0.9 .20 .0018 0042 . . . . . . . . . . . . . . . . . . . . . . 2-0 . . . . . . . . . . . 2.4 .27 .0065 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC . . . . . . . . . 1.0 .39 .0039 .0053 0011 . . . . . . . . 0 4-AC . . . . . . . . . 2.0 .33 .0066 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 2.4 .25 .0067 .0068 0026 . . . . . . . . O 6-P . . . . . . . . . . . 1.5 .46 .0069 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 2.0 .46 .0092 0079 0037 . . . . . . . . 2 8-Ex . . . . . . . . . . 1 .2 . 54 .0065 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 1 .2 . 73 .0088 .0104 . . . . . . . . 0025 1 IO-ACEX . . . . . .. 2.0 .60 .0120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ll-PEx . . . . . . . . . 1 .4 .46 . 0064 .0097 . . . . . . . . 0018 0 12-PEx . . . . . . . . . 3.0 .43 .0129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Per cen Lab. Corn Per cent Gms. Aver- Gain Gain Recov- No. 1910. P, 5. P205. age. over O. over E. ered. Second crop, Series 44 2377 1-O . . . . . . . . . . . 43.5 .24 . 1044 .1036 . . . . . . . . . . . . . . . . . . . . . . . 2-O.... . . . . . .. 60.4 .17 .1027 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 64.5 .22 .1419 .1347 0311 . . . . . . .. 2O 4-AC . . . . . . . . . 63.7 .19 .1274 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-P . . . . . . . . . .. 48.4 .30 .0968 . 1014 . . . . . . . . . . . . . . . . . 6-P . . . . . . . . . .. 50.5 .21 . 1060 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 47.1 .27 .1272 .1104 0068 . . . . . . . . 5 8-Ex . . . . . . . . . . 40.7 .23 .0936 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 73.0 .18 .1387 .1508 . . . . . . . . 0404 26 v 10-ACEx . . . . . .. 62.6 .30 . 1628 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11-PEx......... 53.0 .21 .1113 .1108 . . . . . . .. 0004 0 12-PEx.........’ 58.0 .19 .1102 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. - _ Per cen Lab. Sorghum Per cent Gms. Aver- Gain Gain recov- No. 1910. 205. P205“. age. over O. over E. ered. Third crop, Series 44. 2377 1-O . . . . . . . . . . . 11.4 38 .0433 0443 . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . . . 13.7 33 .0452 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC . . . . . . . . . 11.7 46 .0538 .0594 0151 . . . . . . .. 10 1 4~AC . . . . . . . . . 13.8 47 .0649 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 15.2 32 .0486 .0450 0007 . . . . . . . . 4 6-P . . . . . . . . . .. 12.9 32 .0413 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . .. 17.2 36 .0619 .0558 0115 . . . . . . .. 8 7 8-Ex . . . . . . . . . . 14.2 35 .0497 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9—ACEX . . . . . . . 12.6 49 .0617 .0658 . . . . . . . . 0100 6 7 lO-ACEx . . . . . . . 13.7 .0699 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-PEx. . . . . . . .. 13.2 36 .0475 0470 . . . . . . . . . . . . . . .. (1 12-PEx......... 14.1 33 .0465 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Per cent Lab. Mustard Per cent Gms. Aver- Gain Gain recov- No. 1911. P505 P505 age. over O. over E. ered. Fourth crop, Series 44 2377 1-O . . . . . . . . . . . 1.0 50 .0050 0080 . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . .. 2.2 50 .0110 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC* . . . . . . . . 4.8 50 .0240 0205 0125 . . . . . . . . 8 3 4-AC . . . . . . . .. 3.4 50 .0170 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-P . . . . . . . . . .. 3.2 50 .0160 0098 0018 . . . . . . .. 0 6 6-P . . . . . . . . . . . 0.7 50 .0035 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . 2.3 50 .0115 0155 0075 . . . . . . .. 6 6 8-Ex . . . . . . . . .. 3.9 50 .0195 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9—ACEX . . . . . . . 5.9 50 .0295 0273 . . . . . . . . 0118 7 8 IO-ACEx . . . . . . . 5.0 50 . 0250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-PEX. 3.3 50 . 0165 0235 . . . . . . . . 0080 2 3 12-PEx 6.1 50 .0305 . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . *New additions of P, Ex and AC. Ex——1125 gms P505 No. 32222. Calculations based on new addition. v AVAILABILITY 0F PHOSPHORIC A010 IN R001: PHOSPHATE. TABLE 6—Continued. CROPS IN SERIES 44. 23 _ Per cent Lab. Corn Per cent Gms. Aver- Gain Gain Recov- No. 1911. 2 s. P205. age. over O. over E ered. Fifth crop, Series 44. _ 2377 1-0 . . . . . . . . . . . 15.3 . 19 .0291 .0406 . . . . . . . . . . . . . . . . . . . . . . . . O . . . . . . . . . .. 23.7 .22 .0521 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 41.0 . 19 .0779 . 0729 . 0323 . . . . . . . . 21 .5 4-AC . . . . . . . . . 29 . 5 .23 .0678 . . . . . . . . . . . . .‘ . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 23.2 .21 .0487 .0368 . . . . . . . . . . . . . . . . 0 6-P . . . . . . . . . .. 11.3 .22 .0249 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 44.8 .21 .0941 0880 .0474 . . . . . . . . 42. 1 8-Ex . . . . . . . . . . 29.2 .28 .0818 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 43.5 .26 1131 1178 . . . . . . . . .0298 19.2 IO-ACEx . . . . . . . 53.2 .23 . 1224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx* . . . . . . . . 38.3 .23 .0881 .0728 . . . . . . . . 0 0 .12-PEx . . . . . . . . . 19.8 .29 .0574 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *If N0. 11, PEx excluded, availability of rock is still zero ' _ _ Per cent Lab. Sorghum Per cent Gms Aver- Gain Gain recov- No. 1911. 2 5. P205 age. over O over E ered. Sixth ciop, Series 44. 2377 1-0 . . . . . . . . . . . 1 .5 .35 .0,053 0158 . . . . . . . . . . . . . . . . . . . . . . . . 2-0 . . . . . . . . . .. 11.4 .23 .026 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 28.5 .23 .0655 .0410 .0252 . . . . . . . . 16.8 4-AC . . . . . . . .. 4.0 .41 0164 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 4.8 .34 0163 0130 . . . . . . . . . . . . . . . . 0 6-P . . . . . . . . . . . 3.7 .26 .0096 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 20.7 .21 .0435 .0464 .0306 . . . . . . . . 27.2 8-Ex . . . . . . . . . . 15.4 .32 .0493 . . . . .; . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx* . . . . . . .6 . 65 0104 .0412 . . . . . . . . 0 0 10-ACEx . . . . . . . 27.7 .26 .0720 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx . . . . . . . . . 17 .4 . 27 .0470 0360 . . . . . . . . . . . . . . . . . . . . . . . . 12-PEx* . . . . . . . . 5.2 .48 .0250 . . . . . . - . . . . . . . . . . 0 0 *If No. 9 excluded, availability of acid phosphate is 171 per cent. *If No. 12 excluded, availability of rock phosphate is 0.2 per cent. _ _ Per cent Lab, Mustard Per cent Gms. Aver- Gain Gain recov- No, 1910. P205 P205 age. over O. over E ered. First crop, Series 44. 2378 g8 . . . . . . . . . . . 1 .30 .0031 .0031 . . . . . . . . . . . . . . . . . . . . . , . . . 3-AC . . . . . . . . . . .5 .25 .0011 .0046 .0015 . . . . . . .. 1 .0 4-AC . . . . . . . . . . 2.5 .32 .0080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 1.0 .41 .0041 .0028 0 . . . . . . .. 0 6-P . . . . . . . . . .. .7 .20 .0014 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 1.0 .31 .0031 .0050 .0019 . . . . . . .. 1.4 S-Ex . . . . . . . . . . 2.0 .34 .0068 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 3.2 .63 0202 0199 . . . . . . . . 0149 9.9 10-ACEx . . . . . .. 3.3 .59 .0195 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-PEx . . . . . . . . . 1.2 .34 .0041 0042 . . . . . . . . 0 0 12-PEx 1.2 . 36 .0043 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 TEXAS AGRICULTURAL EXPERIMENT STATION. TABLE 6——Continued. CROPS IN SERIES 44. _ _ Per cent Lab. Corn Per cent Gms. Aver- Gain Galn Recov- No. 1910. P2 5. P205 age. over O. over E cred. Second crop, Series 44 2378 1-0 . . . . . . . . . . . 27.0 .21 .0567 .0569 . . . . . . . . . . . . . . . . . . . . . . . . -O . . . . . . . . . .. 27.2 .21 .0571 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . .. 51.1 .19 .1085 1024 .0455 . . . . . . .. 30.3 4-AC . . . . . . . . . 53.5 . 18 .0963 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . .. 19.5 .19 .0371 .0465 0 . . . . . . .. 0 6-P . . . . . . . . . . . 24.3 .23 .0559 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 32.1 .22 .0706 .0737 0168 . . . . . . . . 12.7 8-Ex . . . . . . . . . . 36.5 .21 .0767 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 53.3 .18 .0959 .0936 . . . . . . . . 0199 13.2 IO-ACEX . . . . . .. 53.7 .17 .0915 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11-PEx. 38.0 .20 0760 .0712 . . . . . . . . 0 0 12-PEx 33.2 .20 .0664 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ _ Per cent Lab. Sorghum Per cent Gms Aver- Gain Gain recov~ N0. 1910. 2 5. P205 age. over O over E ered. Third crop, Series 44. 2378 1-O . . . . . . . . . . . 18.7 .23 .0338 .0382 . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . .. 20.3 .21 .0426 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC . . . . . . . . . 14. 5 .34 .0493 .0478 .0096 . . . . . . . . 6.4 4-AC . . . . . . . . . 12.5 .37 .0462 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 12.3 .25 .0307 .0368 0 . . . . . . . . 0 6-P . . . . . . . . . .. 22.6 .19 .0429 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 23.2 .20 .0464 .0491 0109 . . . . . . . . 7.5 8-Ex . . . . . . . . .. 23.5 .22 .0517 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-ACEx . . . . . . . 15.2 .36 .0698 .0631 . . . . . . . . 0140 9.3 10-ACEx . . . . . . . 17.1 .33 .0564 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-PEx. 18.3 .28 .0512 .0447 . . . . . . .. 0 0 12-PEx 14.1 .27 0381 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lab. Mustard No. 1911. . _ _ __ Fourth crop, Series 44. 2378 1-O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . 8 —O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 3-AC* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 4-AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .' 2.5 5-P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 6-P- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1 . 8 7-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 8-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 0 9-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 lO-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 7 ll-PEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 12-PEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . 9 *New additions of P, Ex, and AC, Ex——1125 gm. P205 N0. 3222. on new addition. Calculations based AVAILABILITY OF PHOSPHORIG A011) IN ROCK PHOSPHATE. 25 TABLE 6—Continued CROPS IN SERIES 44. Per cent lab Corn Per cent Gms. Aver- Gain Gain Recov- No. 1911. P205. P205. age. over O. over E. ered. Fifth crop, Series 44. 2378 1-0 . . . . . . . . . . . 9.9 20 .0198 0302 . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . . . 23.9 17 .0406 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC . . . . . . . . . 48.0 14 .0672 0546 0244 . . . . . . . . 16 3 4-AC . . . . . . . . . 32.3 13 .0420 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 26.4 22 .0581 .0511 0209 . . . . . . . . 7 0 6-P . . . . . . . . . .. 21.0 21 .0441 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 42.8 17 .0728 0658 0356 . . . . . . . . 31 6 8-Ex . . . . . . . . . . 39.2 15 .0588 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 57.3 17 .0974 0925 . . . . . . . . 0267 17 1 10-ACEx . . . . . . . 48. 6 18 .0875 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx..' 36.5 22 .0803 .0717 . . . . . . .. 0059 1 9 12-PEx. . . . . .. 48.5 13 .0631 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . » _ _ Per cent Lab. Sorghum Per cent Gms. Aver- Gain Gain recov- N0. 1911. P205. P205. age. over O. over E. ered. Sixth crop, Series 44. 2378 1-O. . . .' . . . . . .. .7 24 .0017 0148 . . . . . . . . . . . . . . . . . . . . . . .. 2-0 . . . . . . . . . . . 12.1 23 .0278 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC . . . . . . . . . 24.0 21 .0504 0382 0234 . . . . . . . . 15 6 4-AC . . . . . . . . . 8.1 32 .0259 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-P . . . . . . . . . . . 17.4 26 .0452 0370 0222 . . . . . . . . 7 4 6-P . . . . . . . . . .. 9.3 31 .0288............. . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 16.1 24 .0386 0399 0251 . . . . . . . . 22 3 8-Ex . . . . . . . . .. 19.6 21 .0412 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 32.1 20 .0642 0574 . . . . . . . . 0175 11 7 IO-ACEX . . . . . . . 18.7 27 .0505 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-PEx. 22.3 25 .0558 .0536 . . . . . . . . 0137 4 6 12-PEx . . . . . . . . . 25.7 20 .0514 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLE 7. CROPS IN SERIES 45. _ _ Per cent Lab. Sorghum Per cent Gms. Aver- Gain Gain recov- o. 1910. 205. P205. age. over O. over E. ered. First crop, Series 45. 3333 1-O . . . . . . . . . . . 41.5 18 .0747 0833 . . . . . . . . . . . . . . . . . . . . . . . . 2-0 . . . . . . . . . .. 51.0 18 .0918 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 47.9 20 .0958 0998 0165 . . . . . . . . 16 5 4-AC . . . . . . . . . 45.1 23 .1037 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-R . . . . . . . . .. 42.7 21 .0897 .0810 0 . . . . . . .. 0 G-R . . . . . . . . . . . 42.5 17 .0722 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-Ex . . . . . . . . . . 45.4 19 .0862 0770 0 . . . . . . . . 0 8-Ex . . . . . . . . . . 45.2 15 .0678 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 6.4 16 .1024 0984 . . . . . . . . 0214 21 4 10-ACEx . . . . . . . 49.1 19 .0944 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-REx . . . . . . . . 48.2 17 .0819 0856 . . . . . . . . 0086 5 7 12-REx . . . . . . . . 52.5 17 .0892 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lab. Mustard N0. - 1911. Second crop, Series 45 3333 1-O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.31 2-O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 3-AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 4-AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1 5-R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 5 6-R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. 6 7-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 8-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7 9-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.4 10-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.8 llREx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10. 6 12REx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 26 TEXAS AGRICULTURAL EXPERIMENT STATION, TABLE 7-—Continued. CROPS IN SERIES 45. Per cent Lab. Corn Per cent Gms. Aver- Gain Gain Recov- No. 1911. P205. P205 age. over O. over E ered. Third crop, Series 45. 3333 1-O . . . . . . . . . . . 28.3 . 15 .0424 .0433 . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . .. 29.4 .15 .0441 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 35.4 . 14 .0496 .0493 .0060 . . . . . . . . 6.0 4-AC‘ . . . . . . . . . 32.7 . 15 .0490 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-R . . . . . . . . . . . 33 .4 . 14 .0468 .0455 . 0022 . . . . . . . . 1 . 7 G-R . . . . . . . . . .. 34.0 .13 .0442 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 29.8 .16 .0477 .0458 .0025 . . . . . . . . 6.0 8-Ex . . . . . . . . . . 29.2 . 15 .0438 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 34.5 .15 .0517 .0489 . . . . . . .. .0031 3.1 10-ACEx . . . . . . . 30. 7 . 15 .0460 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-REx . . . . . . . . 37.1 . 15 0556 .0535 . . . . . . . . .0077 5. 1 I2-RIEIx . . . . . . . . 34.3 . 15 .0514 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ _ Per cent Lab. Sorghum Per cent Gms. Aver- Gain Gain recov- No. 1910. P205. P205 age over O over E ered. First crop, Series 45. 3653 1-KN . . . . . . . . . 7.0 . 14 .0098 .0090 . . . . . . . . . . . . . . . . . . . . . . . . 2-KN . . . . . . . .. 6.4 . 13 .0083 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-ACKN . . . . . . 42.0 . 12 \ .0504 .0534 0444 . . . . . . . . 44.4 4-ACKN . . . . .. 43.3 .13 .0563 . . . . . . . . . . . . . . . . . . . . . . . . . ... 5-KNR . . . . . . . 22.0 . 13 .0286 .0260 0170 . . . . . . . . 11 .3 6-KNR . . . . . .. 19.5 .12 .0234 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-KNEx. 10. 0 . 14 0140 0148 .0058 . . . . . . . . 13.8 8-KNEx..... 12.0 .13 .0156 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9-KNACEx. . .. 40.2 . 12 .0482 .0421 . . . . . . . . 0.273 27.3 IO-KNACEX... . 37.7 .13 .0390 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-KNREx..... 25.2 .13 .0328 .0315 . . . . . . .. 0.167 11.1 12-KNREx. . . . . 25.2 . 12 .0302 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lab. Mustard No. 1911. Second crop, Series 45. 3653] 1-O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 7 3-AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 5 5-R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 6-R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 7-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 .0 8-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 9-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8 IO-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 l-REx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 12-REx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 Per cent Lab. Corn Per cent Gms. Aver- Gain Gain recov- N0. 1911 P205 P205 age. over O over E ered. Third crop, Series 45. 3653 -O . . . . . . . . . .. 8.7 . 18 .0157 0153 . . . . . . . . . . . . . . . . . . . . . . .. 2-O . . . . . . . . .. 8.7 J17 .014 . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . .. 16.4 . 16 .0262 .0262 0109 . . . . . . .. 10.9 4-AC . . . . . . . .. 17.4 .15 .0261 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-R . . . . . . . . . .. 9.6 .17 .0163 .0200 .0047 . . . . . . .. 3.1 6-R . . . . . . . . . .. 15.7 .15 .0236 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . .. 11.6 .17 0197 0152 . . . . . . . . . . . . . . .. 36.7 8-Ex . . . . . . . .. 6.6 .16 0106 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Q-ACEX . . . . . . . 19.6 .12 0235 .0239 . . . . . . . . .0087 8. 7 IO-ACEX . . . . . .. 18.6 .13 .0242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ll-REx . . . . . . .. 17.2 .17 .0292 .0262 . . . . . . .. .0110 7.3 12-REx . . . . . . .. 14.5 .16 .0232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ‘t: v4. I . AVAILABILITY 0F Pnosrnomc A011) n»: RooK PHOSPHATE, 2"! "3 TABLE 7—Continued. CROPS IN SERIES 45. ,. ‘- ~ Increase Sorghum Per cent Gm. Average ' 2 5 Increase Per cent 1910. 202 P205 ms. over O E recov- Gm. Gm ered. 'es 45. First crop. 1-0 . . . . . . . . . 18.6 . 13 .0242 .0276 . . . . . . . . . . . . . . . . . . . . . . . . 2-0 . . . . . . . . . . . 22. 1 . 14 .0309 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-AC. 57.2 . 14 . 0801 .0774 .0498 . . . . . . . . 49. 8 4-AC . . . . . . . .. 46.7 .16 .0747 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-R . . . . . . . . . . . 28.2 . 14 . 0395 0363 .0087 . . . . . . . . 5. 8 6-H . . . . . . . . . .. 27.5 .12 .0330 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 23.4 . 13 .. 0304 .0281 .0005 . . . . . . . . 1 . 0- 8-Ex . . . . . . . . .. 23.5 .11 .0258 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-AC . . . . . . . 46 . 7 . 15 0700 0709 . . . . . . . . . 0428 . 42. 8 JO-ACEx . . . . . . . 44.9 .16 .0718 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. -REx . . . . . . . . 33 . 5 . 11 .0368 .0388 . . . . . . . . 0107 7. 1 12-REx . . . . . . . . 21.3 . 13 .0407 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mustard 911 Second crop, Series 45. l-.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . .' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6 2-O. . .» . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7 3-AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 4-AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 5-R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6 6-H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _4.2 7-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 8-Ex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 9-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8 IO-ACEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7 l-REx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 . 1 12-REx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 _ _ Per cent Corn Per cent Gms. Aver- Gain Gain recov- 1911 20E P205 age. over O over Ex cred. Series 45, Third crop. 1-O . . . . . . . . . . . 13. 5 . 15 .0202 .0210 . . . . . . . . . . . . . . . . . . . . . . . .. 2-O . . . . . . . . . . .. 16.7 .13 .0217 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC . . . . . . . . . 16.2 . 15 . 0243 .0259 .0049 . . . . . . . . c 4. 9 4-AC . . . . . . . .. 17.1 .16 .0274 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-R . . . . . . . . . . 19.7 . 13 .0256 0187 0 . . . . . . .. 0 6-H . . . . . . . . . .. 7.4 .16 .0118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . .. 11.8 .16 0189 0200 . . . . . . . . . . . . . . .. 48.2 8-Ex . . . . . . . . .. 14.0 .15 .0210 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-ACEx . . . . . . . 16.7 .15 .0250 .0272 . . . . . . . . .0072 7.2‘ 10-ACEx . . . . . .. 21.0 . 14 .0294 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-REx . . . . . . .. 23.3 . 14 .0326 .0291 . . . . . . .. .0091 6. 1 12-REx . . . . . . .. 18.3 . 14 .0256 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ _ Per cent Corn Per cent Gm s. Aver- Gain Gain recov- 1912 2 5 P205 age. over O over Ex ered Series 45, Fourth crop. 1-O . . . . . . . . . .. 11.3 .14 .0158 .0212 . . . . . . . . . . . . . . . . . . . . . . .. 2-0 . . . . . . . . . .. 15.6 .17 .0265 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-AC* . . . . . . .. 25.3 .14 .0354 .0403 .0191 . . . . . . .. 21.1 AC . . . . . . . .. 32.3 .14 .0452 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-R . . . . . . . . . .. 18.6 . 14 .0260 0164 0 . . . . . . . . 0 6-R . . . . . . . . . .. 3.6 .19 0068 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-Ex . . . . . . . . . . 9.1 . 17 0155 0174 . . . . . . . . . . . . . . .. 41. 9 8-Ex . . . . . . . . . . 9.6 .20 0192 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-AC . . . . . . . 26.4 . 13 0343 .0435 . . . . . . . . .0261 28.9 10-ACEx . . . . . . . 37. 6 . 14 .0526 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ll-REx . . . . . . .. 16.8 .15 .0252 .0340 . . . . . . . . 0166 9.1 12-Rex . . . . . . . . . 23. 8 . 18 .0428 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *4»;‘*New additions of AC and R. Previous additions disregarded. 28 TEXAS AGRICULTURAL EXPERIMENT STATION, TABLE 8. CROPS IN SERIES 46. Per cent Lab. Corn Per cent Gms. Gain Gain recov- N0. 1911 ._, 5 P205 over O over Ex ered. Series 46, First crop. 3654 1-0 . . . . . . . . . . . . . . . . . .. 13.4 .21 .0281 . . . . . . . . . . . . . . . . - . . . . . . . . Z-AC . . . . . . . . . . . . . . . . .. 55.1 .14 .0771 .0490 . . . . . . .. 31.4 3-R . . . . . . . . . . . . . . . . . .. 15.6 .16 .0250 . . . . . . .. 0 4- . . . . . . . . . . . . . . . . . .. 15.9 .16 .0254 . . . . . . .. 0 5-ACE . . . . . . . . . . . .. 42.2 .14 .0591 . . . . . . .. .0337 21.6 G-RE . . . . . . . . . . . . . . . . .. 21.7 .14 0304 . . . . . . .. .0050 l .5 k _ Pen cent Lab. Sorghum Per cent Gms. Gain Gain recov- No. 911 2 5 P205 over O over E ered. l Series 46, Second crop. ‘ 3654 -O . . . . . . . . . . . . . . . . . .. 11.5 .11 .012 . . . . . . . . . . . . . . . . . . . . . . 2-AC . . . . . . . . . . . . . . . . .. 26.6 .12 .0319 0192 . . . . . . .. 12.3’ -R . . . . . . . . . . . . . . . . . .. 22.9 .13 .0298 .0171 . . . . . . .. 5.3- . . . . . . . . . . . . . . . . . .. 12.9 .12 .0155 .0028........ 6.6. 5-ACE . . . . . . . . . . . . . . . . . 25.4 . 10 .025 . . . . . . . . .0099 6.6 6-RE . . . . . . . . . . . . . . . . .. 26.7 .13 .0347 . . . . . . . . 0192 6.0V Per cent": Lab, Corn Per cent Gms. Gain Gain recov- ‘ No. 1911 P20, p.05 over o over E ered. j Series 46, Second crop i 3656 1-O . . . . . . . . . . . . . . . . . . . 27.0 . 15 2-AC . . . . . . . . . . . . . . . . . . 56. 6 . 13 -R . . . . . . . . . . . . . . . . . . . 39 .4 . 15 . . . . . . . . . . . . . . . . . . . . 28.0 .15 5-ACE . . . . . . . . . . . . . . . . . 58.5 . 17 6-ER . . . . . . . . . . . . . . . . . . 37. 5 . 17 I Lab, Sorghum Per cent N0, 911 2 5 i? I Series 46, Second crop 3656 1-O . . . . . . . . . . . . . . . . . . . . 9.0 .17 2-AC . . . . . . . . . . . . . . . . . . 16.7 .16 3—R . . . . . . . . . . . . . . . . . . . 23 . 1 . 16 4-E . . . . . . . . . . . . . . . . . . . 12.7 .15 5-ACE . . . . . . . . . . . . . . . .. 17.3 . 18 ' 6-ER . . . . . . . . . . . . . . . . . . 28.0 .14 Lab, Corn Per cent No, 1911 2 5 Series 46, First crop. 3975 1-O . . . . . . . . . . . . . . . . . .. 14.9 .17 2-A. 13571= .156 . . . . .. 54.8 .14 3-R. 4570= .323 . . . . . . 36.7 . 16 4-E. 4559= .042 . . . . .. ' 14.6 .16 5-EA . . . . . . . . . . . . . . . . . . 48.6 .12 6-ER . . . . . . . . . . . . . . . . . . 27:2 .15 AVAILABILITY OF 1 . .5 IN ROCK PHOSPHATE. 29 HOSPHO“ ' TABLE 8——C\. CROPS IN SERIES 46. _ i _ Per cent Sorghum Per cent Gms. Gam Galn recov- ' 1' 11 I 2 5 P205 over 0 over E ered. K 'es 46, Second crop. I 1-0 . . . . . . . . . . . . . . . . . .. 9.4 .12 .011 . . . . . . . . . . . . . . . . . . . . . . .. 2-A . . . . . . . . . . . . . . . . . .. 32.6 . 13 .0424 0311] . . . . . . .. 20.0 3-R . . . . . . . . . . . . . . . . . . . 34.7 . 12 .0416 .0303] . . . . . . .. 9.4 4-E . . . . . . . . . . . . . . . . .. 12.7 .13 .0165 .0052 . . . . . . .. f 12.4 5-EA . . . . . . . . . . . . . . . . .. 29.0 16 .0464 . . . . . . ..| .0299 19.2 6-ER . . . . . . . . . . . . . . . . . . 23.8 12 .0286 . . . . . . . .0121 3.8 i _ Per cent Corn ‘Per cent Gms. Gain Gain recov- 1911 I P205 P205 over 0 over E ered | . ‘ I 'es 46, First crop. i i l-O.. . . . . . . . . . . . . . . . . .. 61.3 .20 .122 . . . . . . . . . . . . . . . . . . . . . . .. 2-AC . . . . . . . . . . . . . . . . . . 66.0 .21 . 1386 .0160 . . . . . . .. 10.2 -R . . . . . . . . . . . . . . . . . .. 58.8 .25 .147 .0244 . . . . . . .. 7.1 4-Ex . . . . . . . . . . . . . . . . .. 57.5 .20 1150 . . . . . . . . . . . . . . .. 0 5-ACEx . . . . . . . . . . . . . . . . 69.7 .20 1394 . . . . . . . . .0244 15 .4 fi-REx . . . . . . . . . . . . . . . . . 62.0|’ . .23 1426 . . . . . . . . .0276 8.5 ~ i Perxcent Sorghum Per cent Gms. Gain Gain recov- 1911 205 P205 over 0 over E ered f hes 46, Second crop ~ ' 1-0 . . . . . . . . . . . . . . . . . .. 18.6 .19 .035 . . . . . . . . . . . . . . . . . . . . . . .. 2-AC . . . . . . . . . . . . . . . . . . 23.0 .22 .0506 .0153 . . . . . . . . 9.8 3-R . . . . . . . . . . . . . . . . . . . 26.7 .21 .0561 .0208 . . . . . . .. 6.4 4-Ex . . . . . . . . . . . . . . . . . . 23.9 .20 .0478 0125 . . . . . . . . 30.0 5-ACEx . . . . . . . . . . . . . . . 24.6 .28 .068 . . . . . . . . .0221 14.2 fi-REx . . . . . . . . . . . . . . . . . 26. 7 .20 .0534 . . . . . . . . .0056 1 .8 Per cent Corn Per cent Gms. Gain Gain recov- 1911 P405 P205 over 0 over E ered s 46, First crop. ‘1-0 . . . . . . . . . . . . . . . . . .. 38.8 .34 319 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . . . 37.5 .36 1350 0031 . . . . . . . . .4 3-EA . . . . . . . . . . . . . . . . .. 41.7 .28 168 . . . . . . . . . . . . . . .. 0 4-ER . . . . . . . . . . . . . . . . . . 39.7 .36 1429 . . . . . . . . .0079 2.4 ' Per cent Sorghum Per cent Gms. Gain Gain recov- 1911 P205 P205 over 0 over E ered. I <. 46, Second crop 61-0... . . . . . . . . . . . . . . . .. 26.5 .29 .0768 . . . . . . . . . . . . . . . . . . . . . . .. .2-E . . . . . . . . . . . . . . . . . . .. 18.7 .37 .0692 . . . . . . . . . . . . . . .. 0 3-EA . . . . . . . . . . . . . . . . . . 24.6 .34 .0836 . . . . . . .. .0144 9.2 4-ER . . . . . . . . . . . . . . . . . . 28.0] .33 0924 . . . . . . . . .0232 7. 1 1g <1 “VIRAL EXPERIME‘ 5 30 " ‘TEXAS AemcuLTu... MENT STATION. l; 5.. YN SER _ TABLE 8——Continued. CRU1._ IN SERIES 46. 1.1:) m‘ l I ' I ~ .1 t» m _ _ Per ce L __.. 1 12,2 - Corn .Per cent Gms. Gam Gam recov‘ No. 1911 P2 5 P205 over 0 over h‘ ered. Series 46, First crop. 12.831 1-0. . . .~;.>. . . . . . . . . . . . . .. 55.0 .16 .0880 . . . . . . . . . . . . . . . . . . . . .. ‘t.’ 46.3 .24 .1111 0231 . . . . . . .. 14 g; 43.9 19 .083 0 0 r 47.0 18 0846 . . . . . . . . '1 54.6 24 1310 . . . . . . . . .0464 29 48.4 22 1065 . . . . . . . . .0219 6 w. 2 Q 1 W ’_ Per ce1 Lab. » 1 ,. -. ' SorghumPer cent Gms. Gam Gain recov- No. 1911 P205 _P205 over O over E ered. Serie5 46, Second crop. , 42831 1-0. -‘.~;.-; . . . . . . . . . . . .. 39.0 . .18 .0702 . . . . . . . . . . . . . . . . . . . . . . .. , . 2-A. . .105; . . . . . . . . . . . .. ' 45.4 .20 .0908 .0206 . . . . . . . . 13. = 3-H . . . . . . . . . . . . . . . . . .. 43.0 19 .0817 .0115 . . . . . . .. 3. , 6 .4-E . . . . . . . . . . . . . . . . . . . 44.9 17 .0763 .0061 . . . . . . . . 14'. . Pié-EA . . . . . . . . . . . . . . . . . . 44.5 .23 . 1023 . . . . . . . . .0260 16 fir-ER . . . . . . . . . . . . . . . . . . 44.2 .20 .0824 . . . . . . . . .0061 1 1 \ 1 J | ' 1 TABLE 9. cn01=s IN SERIES 41. 1 5 | I ‘ i * _ _ Percen Lab.; I Corn Per cent Gms. Ga1n Gam addltiol N0. __ 1911 P205 P205 over O over E recov- l ‘ .6“ ) ered. 11m‘. l‘ , _ - i E. ’ Q ' 5 S 151147, F' t . i 3654 er 111-0. . .115. . .6199 . . . . . . . .. 6.7 .16 01 . . . . . . . . . . . . ..' . . . . . . . 7.5 15 0112 0005 . . . . . . . . 1 29. 7 12 0356 . . . . . . . . | 0244 15,1 ~ 6.7 16 .0107 . . . . . . .. 0000 4 . P‘. 6.2 15 .0093 . . . . . . . 0000 i; __f.___ __ ‘ _ f 5 5 5* 4 . _ _ Per cen Lab.» .SorghumyPer cent Gms, Gam Gam recov- N . I 1 1 1 P205 P205 over 0 over Ex cred;- | _ 5 l ‘Series 47, Second crop.- 3634 3 9 .19 .0074 . . . . . . . . . . . . . . . . . . . . . . .. 6 2 .17 .0105 0031 . . . . . . .. » w»; 21 7 .21 .0456 . . . . . . .. 0351 22. 51.1w. 6 6 .15 .0099 . . . . . . .. , 1m 6 l. .15 .0091 . . . . . . .. 0 J I _ _ { Per c Labv‘ Corn Per cent Gms. Gam Gam | recov’ No. i ~ - - ~ 9 - - 1911 P205 P205 over O over E I ered.; 1 ._._1_ _‘ 151-1 ' ' ' . 3:111’; . . . . .1 Series 47,..Ilr§t CPQP- 4582 1-0 . . . . . . . . . . . . . . . . . . . 50.1 .20 .1002 . . . . . . . . . . . . . . . . . . . . .. 1 2-E . . . . . . . . . . . . . . . . . .. 48.3 .24 .1159 0157 . . . . . . .. J S-EA . . . . . . . . . . . . . . . . .. 54.0 .28 .1512 . . . . . . .. .0353 22 f 4-ER1 . . . . . . . . . . . . . . . . . 53.2 .24 .1277 . . . . . . .. .0118 1 5-ER2 . . . . . . . . . . . . . . . .. 47.7» .24 .1145 . . . . . . . . . . . . . . .. 1 6-ER5 . . . . . . . . . . . . . . . .. 53.61 .24 .1296 . . . . . . .. 0137 l 1 AVAILABILITY OF PHOSPHORIC A011) IN R00K PHOSPHATE. 31 1 TABLE 9—Continued. CROPS IN SERIES 47. ‘"1 Lab A s h P t c. c. ' c; " 1136mm . ~ org um er cen ms. a1n a1n ~ recov- N0. 1 1911 P202 P205 over O over Ex ered. i _ 1 i’ Series 47, First crop. 1 1 2 l-O . . . . . . . . . . . . . . . . . . . 3.9 .49 0 91 . . . . . . . . . . . . . . . . . . I . . . . . . . . . . . . . . . . . . . . . . . . 032g 0178 . . . . . . .. 14.8 i 4-ER..'.'.'.'.'.'.'.'.'.'.'IIIIII 12:1 35 0424 IIIIIIII M10055 1.8 5-ER2 . . . . . . . . . . . . . . . . . 12.1 38 0460 . . . . . . . . .0091 2.8 EH5 . . . . . . . . . . . . . . . . . 12.4 38 0471} . . . . . . . . .0102 0.3 1 1 1 Per cent Lab Corn [Per cent’ Gms 1 Gain Gain recov- No 1911 1 P205 F P205 1 over O over E ered 1 1 1 1 1 Series 47, First crop 1 1 1 ‘A 6 -O . . . . . . . . . . . . . . . . . .. 7.51 .161 012 . . . . . . . . . . . . . . . . . . . . . . .. 2—E . . . . . . . . . . . . . . . . . . . 31.51 .13 .0409 0289 . . . . . . .. 24.1 3—EA . . . . . . . . . . . . . . . . .. 47.31 .13 .0615 . . . . . . . . .0206 13.2 g-ggi . . . . . . . . . . . . . . . .. 2g .1731 gégi, . . . . . . .. 808g, 2.2 e-ERZIIIIIIIIIIIIIIIII 4s 0* I131 0s061IIIIIIII 0197 6Z4 1 i A 1 1 l Per cent 1Sorghum Per cent1 Gms. 1 Gain Gain recov- A. o_ 1911 1 P205 1 P205 over O over Ex 1 ered. -. 1 1 1 1 1 1 . Series 47, First crop. 1 1 1 1 1 a 2.7 .211 .0057 . . . . . . . . . . . . . . . . . . . . .. , 2-E . . . . . . . . . . . . . . . . . 8.3 .161 .0133 .0076 . . . . . . . .- 6.3 3-EA . . . . . . . . . . . . . . . . .. 15.6 .251 .0390 . . . . . . . . .02571 16.5 4-ER, . . . . . . . . . . . . . . . .. 23.4 .22‘ .0515 . . . . . . .. .0382I 11.7 5-ER2 . . . . . . . . . . . . . . . .. 22.3 .231 .0513 . . . . . . .. 03801 11.8 1 6-ER5 . . . . . . . . . . . . . . . .. 23.61 .221 0519 . . . . . . .. 03861 12.2 1 1 f 77W flg_i}7ff~ 1 7Q P t 1 er en Lab. Corn 1Per cent1 Gms. Gain 1 Gain recgv- N0. 1911 1 P205 1 P205 over O 1 over E\ ered. 1 1 . 1 1, 1 Series 47, First crop. 1 1 I587 1-0 . . . . . . . . . . . . . . . . . .. 31.41 .171 .053 . . . . . . ..1 . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .. .151 02851. . . - . . . . . . . . . . . . . . . . . . . 1 . 1 . . . . . . . . . 4-ER1.’. . . . . . . . . . . . . . .. 45.91 .191 0872 . . . . . . . 0053 1.7 5—ER2 . . . . . . . . . . . . . . . . . 45.1‘ .17; 0767 . . . . . . . .1 . . . . . . . . 0 6-ER2 . . . . . . . . . . . . . . . . .. 47.4 .191 0901 . . . . . . . .1 0082 2.6 7-E . . . . . . . . . . . . . . . . . .. 43.6‘ .191 082s. . . . . . . . . . . . . . . . . . . . . .. 1 1 1 p 1 Lab. Sorghum Per cent Gms. 1 Gain Gain r2555? Y0. _ . 1911 P505 P205 ' over O overEx ered. __ . 1 Series 47, -Second crop 1 L587 1-O . . . . . . . . . . . . . . . . . .. 17.4 .18 .0313 . . . . . . . . . . . . . . . . . . . . . . . . 2-E . . . . . . . . . . . . . . . . . .. 28.8 18 .0518] 0205 . . . . . . . . 17. 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 007(1) 4.8 5-ERQIIIfIIIIIIIIIIIII 29Is 19 I05es1IIIIIIII 0034 1.0 6-ER5 . . . . . . . . . . . . . . . . . 27.8 21 .05841 . . . . . . . . 0052 1.6 -E 24.9 22 05471 32 TEXAS AGRICULTURAL EXPERIMENT STATION. TABLE 10. CROPS IN SERIES 48. 1913 Per cent Lab. weight Analysis Grn. Gain Gain recov- No. corn per cent P205 over O over E ered. Series 48, First crop. 2342 -O . . . . . . . . . . . . . . . . . . . 17.5 . 18 .031 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 26.5 .16 .0424 0109 . . . . . . .. 12.6 3-EA . . . . . . . . . . . . . . . . . . 43.2 .15 .064 . . . . . . . . .0224 29.0 4-ER . . . . . . . . . . . . . . . . .. 28.5 .18 .051 . . . . . . .. .0089 5.8 A . . . . . . . . . . . . . . . . . .. 27.0 .16 .0432 .0117 . . . . . . .. 15.2 Sorghum 191 Second crop-—Sorghum 1-O . . . . . . . . . . . . . . . . . .. 14.1 .13 .018 . . . . . . . . . . . . . . . . . . . . . . .. 2—E . . . . . . . . . . . . . . . . . .. 26.3 .14 .0368 0180 . . . . . . .. 20.8 3-EA . . . . . . . . . . . . . . . . . . 29.0 .15 .0435 . . . . . . . . .0067 8.6 4-ER . . . . . . . . . . . . . . . . .. 28.4 .15 .042 . . . . . . .. .0058 3.8 5-A . . . . . . . . . . . . . . . . . .. 22.5 .15 .0338 0150 . . . . . . .. 19.5 Per cent Lab. Corn Per cent Gm. Gain Gain recov- No. 1914 P205 P205 over O over E ered Sereis 48, Third crop. 2342 1-O . . . . . . . . . . . . . . . . . .. 8.7 .17 .014 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 10.4 .18 .0187 .0039 . . . . . . .. 4.5 3-EA . . . . . . . . . . . . . . . . .. 14.4 .19 .0274 . . . . . . .. .0087 11.3 4-ER . . . . . . . . . . . . . . . . .. 20.5 .15 .030 . . . . . . .. 0121 7.9 -A . . . . . . . . . . . . . . . . . .. 10.1 .15 .0152 0004 . . . . . . .. 0.5 Sorghum 191 Fourth crop. 1-O . . . . . . . . . . . . . . . . . .. 14.0 .16 .0224 . . . . . . . . . . . . . . . . . . . . . . .. 2—E . . . . . . . . . . . . . . . . . .. 15.8 .14 .0221 0 . . . . . . .. 0 3-EA . . . . . . . . . . . . . . . . .. 15.7 .13 .0204 . . . . . . .. 0 4-EP. . . . . . . . . . . . . . . . . .. 19.0 .14 .0266 . . . . . . .. .0045 2.9 5-A . . . . . . . . . . . . . . . . . . .. 13.5 .19 .0257 .0033 . . . . . . .. 4.3 1913 Per cent Lab. weight Analysis Gm. Gain Gain recov- No. corn per cent P205 over O over E ered. Series 48, First crop. 2348 -O . . . . . . . . . . . . . . . . . .. 6.5 .26 .0169 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 18.1 .18 .0326 0157 . . . . . . .. 18.2 3-EA . . . . . . . . . . . . . . . . . . 30.3 .20 .0606 . . . . . . . . .0280 36.3 4-ER . . . . . . . . . . . . . . . . .. 18.0 .20 .0360 . . . . . . .. .0191 12.4 5-A . . . . . . . . . . . . . . . . . .. 20.5 .21 .0431 .0262 . . . . . . .. 33.7 Sorghum 191 Second crop. 1-O . . . . . . . . . . . . . . . . . .. 11.9 .17 .0202 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 18.6 .16 .0298 .0096 . . . . . . .. 11.1 3-EA . . . . . . . . . . . . . . . . .. 22.6 .17 .0384 . . . . . . .. .0086 11.1 4-ER . . . . . . . . . . . . . . . . .. 19.3 .23 .0444 . . . . . . .. 0146 9.5 5-A* . . . . . . . . . . . . . . . . .. 14.1 .21 .0296 .0094 . . . . . . .. 12.0 *Four plants only. AVAILABILITY OF PHOSPHORIC A011) IN BOOK PHOSPHATE. 33 TABLE 10—Continued. CROPS INVSERIES 48. ! I Per cent Lab.‘ Corn Per cent Gm. Gain Gain recov- No. 1914 ._, 5 P205 over 0 over E ered. Series 48, Third crop. 235/18 1-0 . . . . . . . . . . . . . . . . . .. 4.7 .22 .010 . . . . . . . . . . . . . . . . . . . . . . . . 2-E . . . . . . . . . . . . . . . . . . .. 7.3 .18 0131 .0028 . . . . . . .. 3.2 3-EA . . . . . . . . . . . . . . . . .. 11.3 .14 .015 . . . . . . .. .0055 7.1 4-ER . . . . . . . . . . . . . . . . .. 9.2 .18 .016 . . . . . . .. .0063 4.1 5-A . . . . . . . . . . . . . . . . . .. 9.0 .18 0172 .0069 . . . . . . .. 8.9 Sorghum 1914 Fourth crop. 1-0 . . . . . . . . . . . . . . . . . .. 2.2 .17 .003 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . . .. 3.9 .32 .0125 .0088 . . . . . . .. 10.2 3-EA . . . . . . . . . . . . . . . . . . 3.3 .24 .0079 . . . . . . . . 0 0 4-ER . . . . . . . . . . . . . . . . .. 3.5 .22 .007 . . . . . . .. 0 0 5-A" . . . . . . . . . . . . . . . . . .. 3.5 .33 .0116 .0079 . . . . . . .. 10.3 1913 Per cent Lab. weight Analysis Grn Gain Gain recov- No. corn _ per cent P205 over 0 over E ered. Series 48. First crop. A 5095 -0 . . . . . . . . . . . . . . . . . .. 21.0 . 15 .0321 . . . . . . . . . . . . . . . . . . . . . . . . 2-E . . . . . . . . . . . . . . . . . . . 44.0 . 15 0660 .0339 . . . . . . . . 39.2 3-EA . . . . . . . . . . . . . . . . . . 47.5 . 16 0760 . . . . . . . . .0439 56.8 4-ER . . . . . . . . . . . . . . . . . . 48.5 . 16 0776 . . . . . . . . .0455 29.7 5-A . . . . . . . . . . . . . . . . . . . 40.0 . 15 0600 .0279 . . . . . . . . 36. l Sorghum 1913 1-0 . . . . . . . . . . . . . . . . . .. 6.3 .14 .0088 . . . . . . . . . . . . . . . . . . . . . - . .. 2-E . . . . . . . . . . . . . . . . . .. 14.9 . 17 .0253 0165 . . . . . . .. 19.1 3-EA . . . . . . . . . . . . . . . . .. 13.6 .15 .0204 . . . . . . .. 0.0000 0 4-ER . . . . . . . . . . . . . . . . .. 15.1 .17 .0257 . . . . . . .. .0003 1.9 5-A . . . . . . . . . . . . . . . . . .. 8.6 .22 0189 0101 . . . . . . .. 13.0 Per cen Lab. Corn Per cent Gm. Gain Gain recbv~ N0. 1914 P205 P205 over O over E ered." Series 48, Third crop 5095 1-0 . . . . . . . . . . . . . . . . . . . . 6.2 . 15 .0093 . . . . . . . . . . . . . . . . . . . . . . . . 2-E . . . . . . . . . . . . . . . . . .. 9.5 .14 .0133 .0040 . . . . . . .. 4.6 3-EA . . . . . . . . . . . . . . . . .. 13.7 . 15 .0206 . . . . . . .. .0073 9.4 4-ER . . . . . . . . . . . . . . . . .. 13.2 .21 .0277 . . . . . . .. 0134 8.7 5-A . . . . . . . . . . . . . . . . . .. 11.4 .15 .0171 .0078 . . . . . . .. 10.1 Sorghum 191 Fourth crop. 1-0 . . . . . . . . . . . . . . . . . .. 0.1 .47 .0005 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 3.5 .20 .0070 .0065 . . . . . . .. 7.5 3-EA . . . . . . . . . . . . . . . . . . 1 .7 .29 .0049 . . . . . . . . 0 0 4-ER . . . . . . . . . . . . . . . . .. 0.1 .52 .0005 . . . . . . . . 0 0 5-A . . . . . . . . . . . . . . . . . .. 3.7 .24 .0089 .0084 . . . . . . .. 10.9 1 34 TEXAS AGRICULTURAL EXPERIMENT STATION. TABLE l0—Continued. CROPS IN SERIES 48. 1913 Per cent Lab, weight Analysis Gm. Gain Gain recov- NO corn per cent P205 0ver_0 over E ered. Series 48, First crop 5701 1-0 . . . . . . . . . . . . . . . . . . . 10.9 .21 .0229 . . . . . . . . . . . . . . . . . . . . . . . . 2-E . . . . . . . . . . . . . . . . . .. 22.7 .16 .0363 0142 . . . . . . .. 16.4 3-EA . . . . . . . . . . . . . . . . .. 42.5 .16 .0680 . . . . . . . . .0317 41.0 “ 4-ER . . . . . . . . . . . . . . . . . . 27.2 . 18 .0490 . . . . . . . . 0127 8.3 5-A . . . . . . . . . . . . . . . . . .. 29.4 .15 .0441 .0320 . . . . . . . . 41.4 6-R . . . . . . . . . . . . . . . . . .. 15.8 .17 .0269 .0048 . . . . . . .. 3.1 7-0 . . . . . . . . . . . . . . . . . .. 11.2 .19 .0213 . . . . . . . . . . . . . . . . . . . . . . .. Sorghum 91 Second crop. 1-0 . . . . . . . . . . . . . . . . . .. 11.2 .18 0202 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 20.0 .15 0300 0132 . . . . . . .. 15.3 3-EA . . . . . . . . . . . . . . . . .. 17.6 .24 .0420 . . . . . . .. .0120 15.5 4-ER . . . . . . . . . . . . . . . . . . 20.8 . 16 .0333 . . . . . . . . .0033 2.2 5-A . . . . . . . . . . . . . . . . . .. 16.0 .14 .0224 .0056 . . . . . . .. 7.2 6-R . . . . . . . . . . . . . . . . . .. 15.1 .144 .0211 .0043 . . . . . . .. 2.8 7-0 . . . . . . . . . . . . . . . . . . . 9.5 . 14 0133 . . . . . . . . . . . . . . . . . . . . . . . . _ Per cent Lab, Corn Per cent Gm. Gain Gain recov- No. 1914 2 5 P205 over 0 over E ered Third crop. 5701 1-0 . . . . . . . . . . . . . . . . . . . 3.2 .25 .0080 . . . . . . . . . . . . . . . . . . . . . . . . 2-E . . . . . . . . . . . . . . . . . .. 4.5 .19 .0086 .0012 . . . . . . .. 1.4 3-EA . . . . . . . . . . . . . . . . . . 3.5 .20 .0070 . . . . . . . . 0 4-ER . . . . . . . . . . . . . . . . .. 7.0 .17 .0119 . . . . . . .. .0039 2.5 5-A . . . . . . . . . . . . . . . . . .. 5.2 / .17 .0088 .0014 . . . . . . .. 1.8 6-R . . . . . . . . . . . . . . . . . .. 7.0 .17 .0119 .0045 . . . . . . .. 2.9 7-O . . . . . . . . . . . . . . . . . .. 3.2 .21 .0067 . . . . . . . . . . . . . . . . . . . . . . .. Sorghum 1914 Fourth crop. 1-0 . . . . . . . . . . . . . . . . . .. 5.5 .20 0110 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 9.5 .19 .0181 .0071 . . . . . . .. 8.2 3-EA . . . . . . . . . . . . . . . . .. 6.5 .20 0130 . . . . . . . . 0 0 4-ER . . . . . . . . . . . . . . . . .. 8.8 .20 0176 . . . . . . .. 0 0 5-A . . . . . . . . . . . . . . . . . .. 5.0 .33 0165 .0055 . . . . . . .. 7.1 6-R . . . . . . . . . . . . . . . . . .. 10.8 .20 .0216 0106 . . . . . . .. 6.9 7-O . . . . . . . . . . . . . . . . . .. 3.4 .32 0109 . . . . . . . . . . . . . . . . . . . . . . . . 1913 Per cent Lab. weight Analysis Gm Gain Gain recov- No. corn per cent P205 over 0 over E ered. Series 48, First crop. 6885 -0 . . . . . . . . . . . . . . . . . .. 13.5 .16 .0216 . . . . . . . . . . . . . . . . . . . . . . .. . 2-E . . . . . . . . . . . . . . . . . . . 39.2 .14 .0549 .0333 . . . . . . . . 38.5 3-EA . . . . . . . . . . , . . . . . . . 54.0 . 14 .0756 . . . . . . . . .0206 26.7 4-ER . . . . . . . . . . . . . . . . . . 44.7 .11 .0492 . . . . . . . . .0000 0 5-A . . . . . . . . . . . . . . . . . . . 49 .2 . 12 .0590 .0374 . . . . . . . . 48.4 6-R . . . . . . . . . . . . . . . . . .. 35.2 .11 .0387 .0171 . . . . . . .. 11.2 Sorghum 1913 Second crop. 1-0 . . . . . . . . . . . . . . . . . .. 7.4 .13 .0096 . . . . . . . . . . . . . . . . . . . . . . .. 2-E . . . . . . . . . . . . . . . . . .. 11.7 .13 .0152 .0056 . . . . . . .. 6.5 3-EA . . . . . . . . . . . . . . . . .. 19.7 .16 .0315 . . . . . . .. .0163 21.1 4-ER . . . . . . . . . . . . . . . . .. 29.3 .14 .0410 . . . . . . .. .0258 16.2 "-A . . . . . . . . . . . . . . . . . .. 14.1 .15 .0212 .0116 ~ . . . . . . .. 15.0 6-R . . . . . . . . . . . . . . . . . .. 15. .12 0180 .0084 . . . . . . .. 5.5 iAVAILABILITY OF PHOSPHORIO A011) IN ROQ_IQPI;QS,;§;§IATE- 35 W TABLE l0—Continued. CROPS IN SERIES 48. - 1.»<"1:>. v01; iwz mw \. -. t .11 Perh-cen-ilf/ Corn Per cent Gm. Gain p Gain f ,prec0v-H,,g_ , ":_ 1914 205 P205 over O over E ered. a 48, Third crop. a W i? 1-0 . . . . . . . . . . . . . . . . . .. 18 ........ .....:‘- ' . , , . . . .;,’.*‘ 2-E . . . . . . . . . . . . . . . . . .. 5.6 19 .0106 0045 . . . . . . .. 5,2 ., l 3-EA . . . . . . . . . . . . . . . . . . 10.1 14 0142 . . . . . . .. 0036 41.17‘- 4-ER . . . . . . . . . . . . . . . . .. 17.9 14 0251 . . . . . . .. 0190 12.4 . . . . . . . . . . . . . . . . .. 7.5 15 0113 0052........ 6.7 tj-ER . . . . . . . . . . . . . . . . . . 9.0 18 0162 0101 6.6M, Sorghum I.» {I 1914 1 i u F“ 1-0 . . . . . . . . . . . . . . . . . .. 4.0 25 .0100 . . . . . . . . . . . . . . . . . . . . . i». . . . . . . . . . . . . . . . . . .. 4.5 31 .0140 0040 ' 446!‘ 3-EA . . . . . . . . . . . . . . . . .. 6.5 21 .0137 . . . . . . . . . ...,. i .» 4-ER . . . . . . . . . . . . . . . . .. 10.7 22 .0235 . . . . . . .. .0095 6.2‘ ' 5-A . . . . . . . . . . . . . . . . . . . 5.0 25 0125 0025 . . ,.. . 3,12 A 6-R . . . . . . . . . . . . . . . . . . . 9.7 20 0194 0094 . . . . . . 612 if: 45. Soils 3333, 3653, 3652. Weight 5 kg. g-Additions tassium chloride and ammonium nitrate; 0.1.,g,1n_., available“, ‘_ric acid in acid phosphate N 053194 ; 0.15 gm. totahphosphoric,» phosphate rock N0. 729; '5 gms. excrement N 0,917,.“ containing, ‘ti. phosphoric acid. Planted 1 gm. sorghum July.,9,,.ha-rveste_._. l". 3: ' , (‘IVE .'" ’ l" idcrop, mustard: added 1 gm. each ammonium.;,nitrate,,.art L,‘ u sulphate; planted 1 gm. mustard October._,1,_-3, and harvested January 3, 1911. ,;,,,.,,, 1.... ,.A_,.H.,,H v crop; corn: added.1 gm. each ammonium nitrateiand potash. iphate. Planted 1.8-1.9 gm. corn; 5 grains on March 24, 1911; ‘to 4 stalks on April 10, harvested June 22, 1911. f; crop (3652 only); corn: added 1 gm. each ammonium ni- “d potassium sulphate; .09 gm. available phosphoricacidsin acid 14068; 0.183 gm. total phosphoric acid in .ac~id~“/‘phospl1ia?te ‘lanted corn April 10, 1912, harvested June‘ ‘25, 1912.“ ~10 _,!;6. Soils 3654, 3656, 3975, 2409, 2829, 2831;» Added onium nitrate and sulphate of potash; 10 gms. excrement (ray.- i D, containing .042 gm. phosphoric acid, 1 gm. acid phosphate ; 1 equals .156 gm. available phosphoric acid; 1 gm. phosphate ' 4569 equals .322 gm. total phosphoric acid. Weights of pots: i, 8600 gms. soil; 3654, 8200 gms."; 3656, 8100 gms.; 3975, 7600 09, 6800 gms.; 2829, 6700 gms. planted 5 grains corn, 1.8-1.9 {April 1, harvested June 14 to June 22, 1911. crop; sorghum: Added 1 gm. ammonium nitrate. Planted "June 23, 1911. harvested August 23 to September 9, 1911. ‘47. Soils 4582, 4587, 4586. Weights: 6500 gms. of No. 00 gms. of No. 4587; 7200. gwns. of No. 4586. Additions: ,h ammonium nitrate and sulphate of potash; 10 gms. excre- 4561, carrying .120 gm. phosphoric acid; 1 gm. acid phos- 71, containing .156 gms. available phosphoric acid; 1 gm. hate N0. 4569 R 1 with .326 gm. total phosphoric acid; r I uiwlv'“v“ 36 TEXAS AGRICULTURAL EXPERIMENT STATION, 1 gm. rock phosphate R 2 No. 4570 with .323 gm. total phosphoric acid; 1 gm. rock phosphate R 3, No. 4479 with .306 gm. total phos- phoric acid. Planted corn-April 10, harvested June 16, 1911. Second crop; sorghum: added 1 gm. ammonium nitrate. Planted 1 gin. sorghum 4582 June 26, harvested August 30, 1911; 4586 planted July 25, harvested October 17; 4587 planted July 25, harvested Sep- tember 30. ' i8eries .48. Soils 2342, 2348, 5095, 5701, 6885. Weight 5 kg. pei pot. Additions: 1 gm. each ammonium nitrate and potassium sul phate; 8 gms. excrement No. 3258 containing .0864 gm. phosphori< acid; 0.5 gm. acid phosphate 24828, containing .0772 gm. availabl< phosphorir; acid; 0.5 gm. phosphate rock (B), containing .153 gm total phosphoric acid. A First crop; corn, 1913. Planted 5 grains corn 2.0-2.2 gms. on soil 2342, 2348, and 5095 on April 24; 5701 and 6885 on June 18, har vested on June 26, 1913. Second crop; sorghum. Added 1 gm. each ammonium nitrate an< potassium sulphate. Planted 2342, 5701 July 8, harvested Septembe 13. 1913; planted 2348 July 8, harvested September 5; planted 509 July 10, harvested September 4, 1913; planted 6885 on July 8, har vested September 5, 1913. Third crop; corn: Added 1 gm. each potassium sulphate and am monium nitrate. Planted April 16, harvested June 18, 1914. Fourth crop; sorghum: Added 1 gm. each potassium sulphate an ammonium nitrate. Planted July 8, harvested September 5, 1914, e) cept No. 2342, which Was harvested September 21,1914. DESCRIPTION OF SOILS. The analyses of the soils are given in Table 11. 844. Haywood, Liberty County; E. C. Carlyle, collector; rice soi 852. Orange, Orange County; black, heavy soil; rice soil. 1956. Between College and Bryan, Brazos County; Kyle’s farm sand. t 37 AVAILABILITY OF PHOSPHORIC A011) IN ROCK ‘PHOSPHATE. e 0.8 0.0 0.05 0.0 2.. 00. wf 50H Hmxwpwww..Hwm€=00R>=0.0008=<=000000 H ...... -00 of. 0.0. Z 2. s. 2. E0. ....>...._.......:..._..00s0 E52... . . . . . . ... e 0.00 0. 3 0 .005 3 d3 00. 5. ee 0N0 mme m . . . . ..>05000 5050C 01304 >000. 80 0.0.0 0.0 0.0.05 0.0 5. be. 00H 35m 000. . . . . . . . . . . . . ............§5€020000 e . . . . . . . . . 0.0 0.00 0.5 00. N3. 00 0N0 00.0. . . . . . . . . . . . 235000 00000©00E 00:00.20 0000. e w.mm “.0 Néw o5. 3. 3. m3. owe. ewe. . . . . . . . . . . . . . . . . . . . . . . . . . . . I. . . . . . . . .. mwom e 0.0 0.00 0.00 M042 2. 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