. Elementary principles of agriculture : a text book for the common schools . Fig. 43. Effect of fertilizers on fine sandy loam. An application of phos- phoric acid is denoted by P; potash by K; nitrogen by N. 111. The Quantity of Fertilizing Substances added to the soil is but a small fraction of the increased weight of the crop which it produces. Minerals are absorbed by the plants in exceedingly small amounts, for they form only about one part in two hundred of the fresh, living plant, and rarely more than five per cent of the dry substance. They are necessary as food substance; they become
. Elementary principles of agriculture : a text book for the common schools . Fig. 43. Effect of fertilizers on fine sandy loam. An application of phos- phoric acid is denoted by P; potash by K; nitrogen by N. 111. The Quantity of Fertilizing Substances added to the soil is but a small fraction of the increased weight of the crop which it produces. Minerals are absorbed by the plants in exceedingly small amounts, for they form only about one part in two hundred of the fresh, living plant, and rarely more than five per cent of the dry substance. They are necessary as food substance; they become a part of the living plant substance. Exceedingly small amounts suffice in the case of iron, sulphur, chlo-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
