. Principles of agricultural chemistry [microform] . /\ y M ^ ^ _y V ^., / 1 A A 4P £0 >..,/ r / .0 .oz .04- 06 .08 JO .u ./<i .le .18 .so 21PfRcenTA9Ei er uirKotin in .son. Fig. 44.—Relation of total nitrogen to the average weight of the cropsgrown without addition of nitrogen in pot \/00 We/cfhr of Crdps wif/iovf- NJ/roaen .02 .04. .06 ■08 Jo JZ M- 16PERCENTAGES OFNJTROGEN IN 30IL ./h Jo Fig. 45.—Relation of total nitrogen of the soil to the average effectof fertilizer nitrogen in pot experiments. from the soils in pot experiments, is given in the following table: ACTIVE
. Principles of agricultural chemistry [microform] . /\ y M ^ ^ _y V ^., / 1 A A 4P £0 >..,/ r / .0 .oz .04- 06 .08 JO .u ./<i .le .18 .so 21PfRcenTA9Ei er uirKotin in .son. Fig. 44.—Relation of total nitrogen to the average weight of the cropsgrown without addition of nitrogen in pot \/00 We/cfhr of Crdps wif/iovf- NJ/roaen .02 .04. .06 ■08 Jo JZ M- 16PERCENTAGES OFNJTROGEN IN 30IL ./h Jo Fig. 45.—Relation of total nitrogen of the soil to the average effectof fertilizer nitrogen in pot experiments. from the soils in pot experiments, is given in the following table: ACTIVE PLANT FOOD, ETC. 195 AveragePercentage of corn possibility nitrogen in soil (bushels per acre) to to to to to Interpretation of Soil Analysis with Weak Solvents.—The cornpossibility figures may be used for the purpose of ascertainingthe probable relative deficiency of a soil. Suppose, for example,a soil contains .086 per cent, nitrogen, 8 parts per million activephosphoric acid, and 105 parts per million active to the tables, we find: Corn possibility(bushels) For nitrogen For active phosphoric, acid For active potash Thus this soil would probably be most deficient in phosphoricacid
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