. Principles of agricultural chemistry [microform] . parts permillion were deficient in about one-half of the Corn Possibility and Availability of Phosphoric Acid. Active phosphoric aciJ(parts per million) Corn equivalent(bushels per acre) Average Maximum O to 10 lo to 20 20 to 30 30 to 40 40 to 60 60 to 80 80 to 100 100 to 190 210 to 420 o 59-039-0 The quantity of phosphoric acid withdrawn from the soil wasalso related to the quantity of active phosphoric acid. In the active; plant food, etc. 191 table^ on
. Principles of agricultural chemistry [microform] . parts permillion were deficient in about one-half of the Corn Possibility and Availability of Phosphoric Acid. Active phosphoric aciJ(parts per million) Corn equivalent(bushels per acre) Average Maximum O to 10 lo to 20 20 to 30 30 to 40 40 to 60 60 to 80 80 to 100 100 to 190 210 to 420 o 59-039-0 The quantity of phosphoric acid withdrawn from the soil wasalso related to the quantity of active phosphoric acid. In the active; plant food, etc. 191 table^ on page 190 the quantity of phosphoric acid withdrawn bythe crop is expressed as bushels of corn per acre which could beproduced with it. —A similar series of experiments carried out withpotash lead to similar results. The percentage of deficient cropsdecreases with the quantity of active potash in the soil. Theaverage percentage of potash in the crop increases with the per-centage of active potash in the soil. The actual quantity of potash. Potash w 5c/L in Parts pcfi MillionFig. 42.—Relation of the potash content of the crop to theactive potash of the soil. removed by the crop increases with the active potash of the cropping, the soil, on analysis, was found to contain lessactive potash than it did before cropping, showing the dis-appearance of active potash due to the crop. ReIvATion o^ Active Potash to Pot Experiments. Active potash in soil(parts per million) Percentag Deficientin potash e of crops Injuredby potash Average weight of crops without potash divided by crop with potash Average percentage of potash in corn crop 67 7984 91 100 98 lOI 116 ^ Texas Station Bulletin 126, p. Texas Station Bulletin 145. 192 PRINCIPLES OF AGRICULTURAL CHEMISTRY The actual amount of potash removed, on an average, from thedifferent soils, is given in the following tabl
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