. Soils, their properties and management. Soils. SOIL STnUCTUBE 185 for developing a favorable crumb structure is obviously the optimum moisture content for the development of the highest tilth. In fact, it can be stated with certainty that the optimum moisture condition for plant gro\vth is the optimum for all favorable soil activities, whether physical, chemical, or biological. Granulation, then, becomes the vital factor in placing the soil in a physical condition such that the highest tilth, that physical criterion which every farmer should strive for, may be developed in any soil. Until pr
. Soils, their properties and management. Soils. SOIL STnUCTUBE 185 for developing a favorable crumb structure is obviously the optimum moisture content for the development of the highest tilth. In fact, it can be stated with certainty that the optimum moisture condition for plant gro\vth is the optimum for all favorable soil activities, whether physical, chemical, or biological. Granulation, then, becomes the vital factor in placing the soil in a physical condition such that the highest tilth, that physical criterion which every farmer should strive for, may be developed in any soil. Until proper granulation is reached, no soil can be expected to yield maximum paying returns. 121. Granulation. — "IVhile it is possible to list the factors that bring about granulation in a soil, it is diffi- cult to state specifically just w^hy this phenomenon takes place. It has been suggested that much of the granule formation in the soil is due to the contraction of the moisture film around the particles when, for any reason, the moisture content is reduced (see Fig. 29). It is known. Fig. 29. — A puddled and a well-granulated soil. that the soil particles tend to be drawn together by this re- duction in the soil moisture, due to the pulling power of the thinned film. If to this condition is added a material which tends to exert not only a drawing power on loss of mois- ture, but also a binding and cementing power when dry, all. 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; Fippin, Elmer O. (Elmer Otterbein), 1879-1949; Buckman, Harry Oliver, 1883-. New York, Macmillan
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Keywords: ., bookauthorlyontlth, bookcentury1900, bookdecade1910, bookyear1915
