. The nature and properties of soils; a college text of edaphology. Soils. SOIL MINERALS #^^^ J^^ CO Fig. 22.—^Diagram showing the practical sources of the soil organic matter and the cycle through which its constituents pass. Note that the carbon, oxygen and hydrogen come very largely from air and water and that fixation of nitrogen may occur if the crop is a legume. Only about 25 per cent, of the organic matter fed to animals ever reaches the soil in farm manure under average con- ditions. granulation. Lime shonld be added if basic materials are lacking, for it promotes bacterial activity as
. The nature and properties of soils; a college text of edaphology. Soils. SOIL MINERALS #^^^ J^^ CO Fig. 22.—^Diagram showing the practical sources of the soil organic matter and the cycle through which its constituents pass. Note that the carbon, oxygen and hydrogen come very largely from air and water and that fixation of nitrogen may occur if the crop is a legume. Only about 25 per cent, of the organic matter fed to animals ever reaches the soil in farm manure under average con- ditions. granulation. Lime shonld be added if basic materials are lacking, for it promotes bacterial activity as well as plant growth. The addition of fertilizers will often be a benefit, as will also the establishment of a suitable rotation. The rotation of crops not only prevents the accumulation of toxic materials, but also, by increasing crop growth, makes pos- sible a larger addition of organic matter by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyon, T. L. (Thomas Lyttleton), 1869-1938; Buckman, Harry Oliver, 1883-. New York, Macmillan
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Keywords: ., bookauthorlyontlth, bookcentury1900, bookdecade1920, bookyear1922
