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Table 3. Grams potash removed by crops second series. Micro- Ortho- Musero- i Chaba- cline clasc Biotite vite Pinite Sulphate zite Stilbih 1177 1178 2563 2397 1393 4562 2551 4646 4595 Crop 1, Sorghum . . . . . . . . . . . . . . 0 .0333 .1729 .1167 0707 3258 0 . . . . . . . . Crop 2, Corn . . . . . . . . . . . . . . . . . . 0 .0062 .1319 .0150 0 0 0 . . . . . . . . Crop 3 Sorghum. . . . . . . . . . . . .. 0270 0 .2248 .0133 0 0142 0 . . . . . . .. I Total . . . . . . . . . . . . . . . . . . . . 0270 0392 .5296 1450 .0707 3400 0 . . . . . . . . .. 4598 Crop 1, Sorghum . . . . . . . . . . . . . . . 0 0083 .2177 .1723 0 .3873 0080 . . . . . . .. Crop 2, Sorghum . . . . . . . . . . . . . . 0 0 .0370 .0277 0 .0060 0 . . . . . . . . Crop 3, Corn . . . . . . . . . . . . . . . . . .0217 .0003 .0380 .0183 .0048 .0694 .0141 . . . . . . . . Crop 4, Sorghum . . . . . . . . . . . . . . .0050 . . . . . . . . .0275 . . . . . . . . . . . . . . . . .0154 .0033 . . . . . . . . Total . . . . . . . . . . . . . . . . . . . 0267 .0086 .3202 .2183 .0048 .4781 .0254 . . . . . . . . 4600 Crop 1, Sorghum . . . . . . . . . . . . . . 0067 0 .1528 .1155 . . . . . . . . .3417 . . . . . . . . . . . . . . .. Crop 2, Sorghum . . . . . . . . . . . . . . .0029 .0078 .0571 .0233 . . . . . . . . .0612 . . . . . . . . . . . . . . . . . Crop 3, Corn . . . . . . . . . . . . . . . . . .0031 0 .0056 . . . . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . Total . . . . . . . . . . . . . . . . . . . . 0127 0078 .2155 1388 . . . . . . . . .4029 . . . . . . . . . . . . . . . . 4606 Crop 1, Sorghum . . . . . . . . . . . . . . .0394 .0821 .0168 0 . . . . . . . . .0114 . . . . . . . . . . . . . . .. Crop 2, Sorghum . . . . . . . . . . . . . . .0089 0 .0488 .0805 . . . . . . . . .0888 . . . . . . . . . . . . . . .. Crop 3, Corn . . . . . . . . . . . . . . . . . .0163 .0457 .2377 1030 . . . . . . . . .1102 . . . . . . . . . . . . . . . . . Crop 4, Sorghum . . . . . . . . . . . . . . .0490 0 .1079 0357 . . . . . . . . .0528 . . . . . . . . . . . . . . .. Total . . . . . . . . . . . . . . . . . . 1136 .1278 .4112 .2192 . . . . . . . . 2632 . . . . . . . . . . . . . . . . 4646 Crop 1, Sorghum . . . . . . . . . . . . 0272 .0946 .1203 1550 O 4085 0 0 Total . . . . . . . . . . . . . . . . . . . . 0272 .0946 . 1203 1550 . . . . . . . . .4085 . . . . . . . . . . . . . . . . _4648 Crop 1, Sorghum . . . . . . . . . . . . . . .0077 .0177 .1441 .1419 .3677 .0515 .0082 ‘ Crop 2, Sorghum . . . . . . . . . . . . . . .0153 .0232 .0945 .0308 .0246 .0644 .0273 .0147 Crop 3, Corn . . . . . . . . . . . . . . . . . . 0 0 .0385 .0045 .0040 0109 0 . Total . . . . . . . . . . . . . . . . . . . . .0230 .0409 .2771 .1772 .0246 .4361 .0897 .0229 j Grams potash added . . . . . .. 2.028 2.362 0.962 0.931 0.518 0.5504 _ 0.100 .028 The amounts of potash added to the pots are shown at the bottom of the table. Smaller quantities of potash were added in biotite, mus- covite, pinite, and sulphate of potash than in orthoclase and microcline, on account of the fact that the potash in the former is more easily taken up. . Table 4. Total percentage of potash removed by all crops second series. 2 t 4594 4598 4600 4606 4646 4648 Average E | Number of crops 3 4 3 4 1 s a 1177 Microcline . . . . . .. . . . . . . . . . . . . . . . . .. 1.33 1.32 0.63 5.60 1.34 1.13 1.89 1178 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . .. 1.67 0.36 0.33 5.41 4.01 1.73 2.25 1393 'nite . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13.65 0.93 . . . . . . . . . . . . . . .. 0 4.75 4.83 2347 Muscovit-e . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.57 23.45 14.91 23.54 16.65 19.00 18.86 2563 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.36 33.30 22.41 42.76 12.51 28.82 26.36 4646 Stilbite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 81.78 40.89 2551 Chabazite . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 25.40 . . . . . . . . . . . . . . . . 0 89.70 28.78 4563 Sulphate of potash . . . . . . . . . . . . . . . . . .. 67 93 95.52 80 50 52 59 81.62 87.13 77.55 Table 4 shows the total percentages of added potash taken up by the crops averaging four in number. They are in the following order, beginning with the lowest: microcline, orthoclase, pinite, tmuscovite, biotite, stilbite, chabazite, sulphate of potash. The variation with stil- bite and the chabazite is very wide in the individual tests. Table 5 contains the average percentage of potash removed per crop in the second series of experiments. It consists of the percentages in Table 4 divided by the number of crops. “ma. ma». “ AVAILABILITY OF POTASH IN SOIL-FORMING MINERALS. 9 Table 5. Average percentage of mineral potash removed per crop second series. ' 4594 4598 4600 4606 4646 4648 Average 1177 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.45 0.33 0.21 1.40 1.34 0.38 .68 1178 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.56 0.36 0.33 1.35 4.01 0.58 1.19 1393 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.55 0.24 . . . . . . . . . . . . . . . . 0 1.58 1.59 2347 Muscovlte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.19 5.86 4.97 5.89 16.65 6.33 7.48 2563 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.36 8.33 7.47 10.69 12.51 9.61 11. 16 2552 Stilblte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 27.26 13.63 2551 Chabazite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 6.35 . . . . . . . . . . . . . . . . 0 29.90 9.06 4563 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . 22.64 23.88 26 83 13.15 81 .-62 29.04 32.86 Table 6 shows the percentage of potash in the materials used, the per cent dissolved by fifth-normal nitric acid (Bulletin 145), and the percentages removed per crop in the experiments discussed in this bulletin. It also shows the relation between the potash dissolved by the fifth-normal acid and that taken up by the crops. in the various series of experiments. If the experiments made by Plummer with larger quantities of minerals were cited, instead of these with smaller quantities, the percentages taken up from the minerals would be about one-half of that given, and probably more nearly related to that in the soil. Q ‘s’ Q § T“? m f/g / — Ave/aye z4vrorfayp of po/orfi ‘S, Qzmoréa/ Li) f/ap 5/0/21 é M/hé/fi/J — fer/a? / G . ‘Q \ x \ Q I =1 ‘k ii V: 3° ‘é i‘ a “* ° E‘ s, s R s a» \ Q Q a N Q k. \ § a, Q ~Q t s \ s a é‘ q l2 l2 l9 IQ b‘ The amount of potash taken by one crop from microcline averages the same as the quantity dissolved by fifth-normal nitric acid. The relation for orthoclase varies from 1:1 to 5.5 times the quantity dis- solved by the nitric acid. One crop removed from muscovite from 0.3 to 0.7 of that dissolved by fifth-normal nitric acid, from biotite 0.3 to 0.5, from stilbite 0.4, and from sulphate of potash 0.2, 0.3, 0.4. The relation decreases with the solubility of the potash mineral, but there is a relation between the potash removed by crops and the potash dissolved from the minerals by fifth-normal nitric acid. The extraction of 7.5 to 12.4 per cent. of the potash per crop from muscovite, and 9.3 to 13.3 per cent. from biotite seems high. All the minerals used in our experiments were finely ground. It is probable that this affects-their availability to crops, so that potash in the soil in these minerals would not be as available as was the case in these experiments. This would also affect the solubility in fifth-normal 10 TEXAS AGRICULTURAL EXPERIMENT STATION. nitric acid. Thus the solubility in fifth-normal nitric acid would rep- resent the availability of potash in these minerals. It would appear from the preceding discussion that the minerals containing high percentages of potash soluble in fifth-normal nitric acid give up their potash more readily to crops than those containing low percentages soluble in fifth-normal nitric acid. It Would also appear 3 that one crop ofithe plants took up potash about equal to that soluble in fifth-normal nitric acid from microcline and orthoclase, and about 3 half of that dissolved from biotite, muscovite, or stilbite, and about four-tenths of that in sulphate of potash. Thus fifth-normal nitric. acid is a measure of the available potash in these minerals. \‘,.§L___ g 5/012 -/l1/eraye ffarremzge of Ffi/as/v 5 _ Iqa/nflrea/ é/ 00,0 f/‘vm a WW/mra/s - fer/es Z s»— a i? o x Q \§__ ~56 ‘a i. Q. ‘$1 u. ‘b ‘a m Q___- c ‘\ 33 ‘~ \ \* s \ Q: Q “’ § m i N m 33 *8 E s Q \ 9) 3 K \ \§ c. P s g 3' s s i‘ s s _‘< lo. IQ 2 s Q5 s s ‘ /‘7m e/a/J A ' Leucite, nephelite, and chabazite appear to be exceptions to the above, but the experiments with them were hot satisfactory or sufficient in number. Minerals which contain potash highly soluble in strong hydrochloric acid give up- their potash more readily to plants than those Which con- tain potash less soluble in strong hydrochloric acid. 11 AVAILABILITY OF POTASH IN SOIL-FORMING MINERALS. m» . . . . . . . 3. 3 om ow o2 . . . . . . . . . . . . . . . cw . . . . . . . . . . . . . . . . . awwsm waoowm don. #5 wgoifi nmauon @392“ Qwfinoohom awx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MQT~QW Pwa .QOMD HQQ rvmzroaQ-m §MQPOQ mfffiwqfl QWN@QQOHQ% $% ..- .- . --.. . . . . . . . . .. .-..-. ... - ... . . . . . . . . . . . . . . . . . . . QQHU MQQ $.X$ .-..-... TJ.&. $..% . . -........ &..$ . . . . . . . . . . . . . . . . . . .-W®.T~0W “QC-MO H@Q §-XX ¢.§ -...-.-.. . . . . - .-.-. X.x 3.x $..? 3:? . . . . . . . . . . . . . . . . . . . . . ....-.-. --..... . &_.@ . . . . . . .. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . QQhQ 2: m? .3...“ 2N v6 55 fifl f m; .2. . . . . . . . . . . . . . . . . . . ..........€a 01in $2 E 223cm Amati 2&5 i6» 6m . . . . . . . . . . . . . . . . . . ............. . . . . . . . . . . . . . . . . ..P.Q®O MQQ Qmfiaa m. § 2x RS Qnzgeé Qéeawz Qspiw Qfiomm 2E5 ofi>oo 32o SEQ Q23 .250 .32 65.5 .0852 62:2 éamE dihuamfl we nfifion 9,50.» E3 133 o» no.6 2S an @258»: nwfion wwfioiw we momufiwm d Beam. 12 p TEXAS AGRICULTURAL EXPERIMENT STATIoN. EXPERIMENTS WITH GRANITE. " In these experiments, 5 kg. soil was used, nothing being added r; pot No. 1, 5 gms. granite to Nos. 2 and 3, 1 gm. each of ammo'i nitrate, dicalcium phosphate, and sulphate of potash to No. 4, 1 1c‘? each of ammonium nitrate and sulphate of potash to No. 5, 1 yf" each of dicalcium phosphate and sulphate of potash to No. 6. Co -j was planted April 11 and harvested June 15. Ammonium nitrate o sulphate of potash was again added, and sorghum planted June 22 hapvelsted August 23. The granite contained 4.94 per cent. of to = po as . f The resultof this experiment is shown in Table 6, and Fig. 1 sho; test on two of the soils with corn. - Table 7. i Experiments with ground granite-Grams per pot. Weight of Crop Potash r O G G 1n - Phos- Grams Gram Gram granite 1 i _ _ phoric Phos- potash potash potash taken 1 None Granite Granite acid Potash phoric up potash nitro- acid . nitro- gen potash gen 8841 Corn . . . . . .. 5.4 5.5 6.5 25.7 7.2 7.4 1355 .1540 .1606 0218 Sorghum.... 1.7 1.6 1.3 36.7 8.0 0.4 0255 .0231 10213 9140 Corn . . . . . . . 5.6 6.4 4.7 30.1 3.5 10.2 2363 .2304 1936 0 Sorghum... . 0.7 0.6 0.6 24.9 9.5 3.2 0132 .0106 0119 9166 Corn....... 3.1 3.2 2.9 23.5 2.7 11.2 1159 .1120 1354 0117 Sorghum ... 1.0 0.6 1.1 29.2 2.7 0.3 0109 .0076 .0177 0012 9300 Corn . . . . . . . 6.9 7.4 8.3 42.4 13.0 11.7 2146 .2338 .2224 0135 Sorghum .. 2.5 2.8 4.2 33.2 10.5 2.5 0421 .0420 .0613 0090 Table 8.‘ Details of pot experiments. Gram Per cent Grams .Increase crop potash potash grams 1592 Series 3—1909 Corn. i a uscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 37.0 48 1824 .0477 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5 55 1347 . . . . . . . . .. L— . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.5 46 1219 B—— . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.1 51 1892 .0547 K- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.4 79 3034 .1687 1585 Series 3-1909 Corn — . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10.6 1.50 0.1590 . . . . . . . . .. 2-M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.6 0.94 0.2124 0534 3—K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.4 1.46 0.3470 1880 4—B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.0 0.95 0 2185 0595 1269 Series 18-—Cotton. _ Microcline—224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7 .84 .0646 .0217 " 9 .5 .76 .0722 . . . . . . . . . . Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . 0 1.45 .120 .0456 r 7. 5 0. 86 .0645 . . . . . . . . . . i 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8.0 0.74 .0592 . . . . . . . . .. O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3.6 0.95 .0342 . . . . . . . . .. Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9 .84 .0578 .0206 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.6 .80 .0768 . . . . . . . . .. Microcline-1177 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 3 0 . 80 I . 0504 .0033 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.9 0.84 .0496 . . . . . . . . .. Orthoclase—-1178 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6 0.80 .0448 .0153 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.9 0.80 .0792 . . . . . . . . . . Microcline-USO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7 0.82 .0467 0035 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 0.68 .0537 . . . . . . . . .. Muscovite—1179 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6 0.74 .0858 .0375 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3 0.78 .0725 . . . . . . . . . . Leucite--711 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 . 1.02| .0255 0 3.2 0.96 .0307 . . . . . . . . . . Leucite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AVAILABILITY OF POTASH IN SOIL-FORMING MINERALS. 13 Table 8. Details of pot experiments-Continued. Gram Per cent Grams Increase crop potash potash grams " - = "ies 18—Cotton—-Continued. '0 .§lephelite——753 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.6 0.92 .0883 ,0372 Wephelite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9.7 0.82 .0795 A Hicrocline-—224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.9 .82 .0811 ,0031 . Aicrocline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 .84 .0672 , _ , , , , _ _ , _ A lhflphate of ,potash—1869 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.2 1.18 .120 _0435 . Sulphate of potash—1870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9.7 1.04 .109 . . . . . . . . .. 0 1829 ............................. .. 7.8 1.04 .0811 ________ __ O 1870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5.0 1.02 .0510 _ , , , _ _ _ _ _ _ Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9. 7 1.00 .097 0265 . iotite ............................................. .. 8.0 1.10 .088 ________ __ f; -Microcline—-1177 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 0 .94 .0564 0 ‘crocline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 .88 .0616 _ , _ , _ , _ _ _ _ Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7.2 1.10 .0792 0079 8 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 1.04 .0686 _ _ _ _ _ , , _ _ _ Muscovite-—1179 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 1.02 .0632 _()()53 . uscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7.5 1.06 .0795 . . . . . . . . . . 1eu0ite——711 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6.9 .74 .0511 0 ueucite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 .98 .0294 _ _ _ _ _ , _ _ __ .Vlicrocline—224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 1.04 .0749 () Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 .78 .0616 _ _ , _ _ _ , _ __ I Sulphate of potash—1871 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3 .95 .0598 0 f; Sulphate of potash—1872 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 1.16 .812 . . . . . . . . . . 1881 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10.4 0.74 .0770 . . . . . . . . .. "0 _ 1882 ............................. .. 9.9 .80 .0851 ........ .. =é=Biot1te . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9" .90 .0711 () Biotite ........ ..' ................................... . . 8.2 .88 .0721 ........ . . Orthoclase—1178 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5 . 78 .0819 0153 01111001800 .......................................... . . 9 . 9 1. 12 . 1108 ........ . . 1408000084179 .................................... . . 18.1 .80 .1127 .0128 _Mu80ovite .......................................... . . 8. 5 .88 .0750 ........ . . ;Leuc1te—711 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7 .84 .0479 0 ~ 1.000114 ............................................. . . 7.7 .80 .0002 ........ .. _» ~- 1, Sorghum. 1» 1-0. .- ............................................ .. 07.2 1.28 .8200 ........ .. 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.0 1.45 .8265 0 - 3 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.7 1.35 .8599 .0333 ; 4Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..-........... 62.7 1.61 1.0095 .1729 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59.7 1.58 .9433 .1167 ' 6 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 68.5 1.31 .8973 .0707 - 7 Sulphate 0f potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70.7 1.63 1.1524 .3258 8 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 62.7 1.24 .7775 0 w 2, Sorghum. _ 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25.3 .79 1998 . . . . . . . . . .. 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 23.4 .97 .2270 0270 7f 3 Orthoclase . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . 26.0 .76 .1976 0 .; 4 Biotite ......................................... .. 29.9 1.42 .4240 .2248 g 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 27.7 .77 .2133 .0133 0 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.5 . 69 . 1966 Pi. 7 Sulphate 0f potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2 .85 .2142 .0142 8 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 23.3 .80 .1864 ‘ M- 3, Corn. ' 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.3 .43 . 1604 . . . . . . . . . . 2 Microcline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35.4 .43 .1522 0 I. 3 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.7 .48 .1666 .0062 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40.6 .72 .2923 . 1319 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ' 33.1 .53 1754 0150 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.8 .29 0864 0 7 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31. 3 . 44 1377 0 abozi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5 .46 1357 0 . - 1, Sorghum. "1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 36.5 .79 .2883 . . . . . . . . . . 2 Microcline . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . .. 29.7 .91 » .2703 0 ,2 3 Othoclase . . . . . . . . . ._ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.7 .88 .2966 .0083 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.0 1.15 .5060 .2177 .,‘ 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 34.0 1.09 .3706 .1723 6 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 39.2 .71 .2783 0 f 7 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.2 1.59 .5756 .3873 _;.8 habozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7 .83 .2963 .0080 , ~ 2, Sorghum. ' 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2.7 .77 .0208 0 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 .79 .0197 0 '5 3 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .‘ . . . . . . . 2.7 0 .58 .0157 0 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4 1.07 .0528 .0370 J Muscovite ...................................... .. 5.0 .97 .0480 .0277. __'.6_Pinite..... ...................................... .. 1.9 .88 .0107 0 ‘ 7 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6 1.03 0268 .0060 ‘, zite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 .74 0170 14 TEXAS AGRICULTURAL EXPERIMENT STATION. Table 8. Details of pot experiments-Continued. , Per cent Grams Grams potash potash crop 1n crop in crop Crop 3, Corn. 1-0._..... ........................................ .. 11.9 .45 .0535 2 Mlcrochne . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.9 .42 .0752 3 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11.7 .46 .0538 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.8 .44 .0915 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16.7 .43 .0718 6 Pinite ....................................... 11.9 .49 .0583 7 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. 6 .48 .1229 8 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5 .41 .0676 4598 Crop 4, Sorghum. _ 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 .74 .0133 2 Microchne . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3.0 .61 .0183 3 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 . . . . . . . . . . . . . . . . . . .. 4 Biotite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 .80 0408 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.2 . . . . . . . . . . . . . . . . . . .. 6 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 . . . . . . . . . . . . . . . . . . . . 7 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 1.70 .0287 8 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6 .64 0166 4600 Crop 1, Sorghum. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.9 .70 .3633 2 Microcline . . . . . . . - . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 50.0 .74 .3700 3 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50.5 .70 .3535 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50.6 1.02 .51661 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 50.4 .95 .4788 6 Sulphate of potash. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.0 1.25 .6750 Crop 2, Sorghum. _ 1— . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4 .47 .0254 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5.9 .48 .0283 3 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7.9 .42 .0332 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.0 .55 .0825 .5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5 .43 .0537 6 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.2 .57 .0866 Crop 3, Corn. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. - 4.0 .49 .0196 .. 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 .54 .0227 3 Orthoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2.1 .69 .0145 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5 .24 .0252 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - . . .- . - - - - . . . . . . . . . . . . . . . . . . . . . .. 6 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 . 74 .0074 4606 Crop 1, Sorghum. ' 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31.9 1.20 .3828 .. 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 36.4 1.16 .4222 3 Ort-hoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 36.9 1.26 .4649 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.6 1.35 .3996 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 29.5 1.26 .3717 6 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.8 1.28 .3942 Crop 2, Sorghum. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7 .91 .0701 2, Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 1.00 .0790 3‘ Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 2 .89 .0552 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~ . . . . . . . . . . . . . 8.2 1.45 .1189 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.2 1.06 1505 6 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13. 7 1.16 1589 Crop 3, Corn. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.8 .61 .0964 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1 .59 .1127 3 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20.6 .69 .1421 4 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.8 1.16 .3341 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.7 .72 .1994 6 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.6 .84. 2066 Crop 4, Sorghum. ' 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 1.02 .0765 2 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.1 .89 .1255 3 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1 .87 .0792 4 Biotite . . . . . . . . . . . . . . . . .' . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3 1.79 .1844 5 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12.2 .92 1122 - 6 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.9 .93 1293 4646 Crop 1, Sorghum. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.5 .78 .3627 2-0 . . . . ..' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 38.1 .96 .3658 3 Mierocline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.6 .84 .3914 4 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48.3 .95 .4588 5 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.6 1.51 .4470 6 Biotite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 46.6 1.12 .5219 7 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.0 1.18 .5192 8 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.4 1.02 3407 Table 8. Details of pot experimentr-Continued. AVAILABILITY OF PoTAsII IN SoIL-FQRMING MINERALS. 15 Per cent ' Grams Grams Grams potash potash potash crop 1n crop 1n crop removed 7 =- Crop 1, Sorghum—Continued. "1 1g ggpgmate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . g 4085 a ozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . '. 4 0 112Sglbite . . . . . . . . . . . . . ; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 . 2 .1892 . .0516 inite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 .4 . 2 . Crop 2, Sorghum. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Microcline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 Muscovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2.1 . . . . . . _ . . . . . . . . . . . . . . . . . . . . . . .. 9 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Stilbite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12 Pinite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Crop 1, Sorghum. 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 42.2 .62 .2616 . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .61; . . . . . lcrocme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 ... . 77 4 Othoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 38.9 .74 .2879 .0177 5 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.3 .87 .3767 .1441 6 Biotite._ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.2 1.00 .4520 . . . . . . . . . . ‘£7; llgluséaovlte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40.8 1.01 .4121 1419 ini e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40.4 .66 .2666 0 9 Sulphate of potash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47.2 1.38 .6514 .3677 10 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~. . . 47.3 1.32 .6244 . . . . . . . . . . a t11_ Stllplte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 42.9 .75 .3217 .0515 12 Plmte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 33.2 .84 .2789 .0082 Crop 2, Sorghum. .1 ‘ 1-0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8.4 .37 .0311 . . . . . . . . .. 2—-0......._ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7.4 .53 .0392 . . . . . . . . .. i gtllclaroiahne . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13.3 .33 .05g5 .0153 0c ase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12.2 .4 .05 6 .0232 5 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.8 .69 .1297 .0945 6 Biotite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3.8 1.18 0 . . . . . . . . .. g gusizcovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .50 .0760 .0308 . 1n1 e . . . . . . . . . . ._ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 .0598 .0246 ' Sulphate of potash . . . . . . . . . . . . . . . . . . . _ . . . . . . . . . . . . . . . 15.3 .62 .0949 .0644 5 . 10 Chabozite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.8 .66 .1043 . . . . . . . . .. p 11 Stilhite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13.3 .47 .0625 .0273 i; 12 Plmte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8.6 .58 .0499 .0147 . Crop 3, Corn. , 1—0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4.6 .29 .0133 . . . . . . . . .. i. . . .._ ........................................ .. 5.7 .26 .0148 ........ .. 3 Mlcroclme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4.3 .22 .0095 0 4 thoclase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 .30 .0096 0 g grofltzrtg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0385 10 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 6 6 . . . . . . . . . . g yusteovite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0045 m1 e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0 9 Sglgéhate of potash . . . . . . . .._. . . . . . . . . . . . . . . . . . . . . . .. * .0040 a 0Z1 e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . - . . 6 . . . . . . . . . . 11 Stilhite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7.8 .32 .0250 0109 12 Pmlte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5.0 .0135 0 t taken up by the acid. " 16 TEXAS AGRICULTURAL EXPERIMENT STATION. ’ As could be expected, the granite had little or no effect as a ‘y tilizer. The potash in granite was dissolved only to a very slig extent. Similar results were secured by Hartwell and Pember, Rh, Island Experiment Station Bulletin 129. Fig. 3. Pot experiments on two soils with granite ( 2G) compared with n ' fertilizer (1-0) and complete fertilizer (4KDN). - ACKNOWLEDGMENT. Analytical worki and other work involved in this bulletin has bee, taken part in by Mr. S. E. Asbury, J. B. Rather, and other memb’ of the staff. i; SUMMARY AND CONCLUSIONS. 1. The amounts of potash taken up ‘by one crop from microzlin average the same as the quantity dissolved by fifth-normal nitric acid“ The amount taken up from orthoclase is somewhat more than that, -2. One crop removed from muscovite on an average 30 to '70 p cent. of the potash dissolved by fifth-normal nitric acid, from biotite 30 to 50, from stilbite 40, from sulphate of potash 20, 3'0, 40 per cent. '3. There is a relation between the potash removed by crops and the potash dissolved from minerals by fifth-normal nitric acid. 4. The so-lubilityof mineral potash in the soil in fifth-normal nitric a acid would then be related to the potash removed by crops. 5'. Minerals which contain potash easily soluble in strong hydro-o. chloric acid give up their potash more readily to plants than those; which contain potash less soluble in strong acid. i 6. Granite has practically no value as a fertilizer.