. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. OBSTRUCTION 97 four feet, and since moisture can rise to heights of from at least three to five feet in fine textured subsoils below the root zone, it is reasonable to assume that a crop growing on a silt loam having a deep silty clay subsoil draws its moisture supply from six to nine feet of soil during a di ought. Compactness.—Compactness or firmness means good contact. Fig 41.—Capillary rise of water in soils. I between the soil grains and crumbs within the seed bed. Since capillary ris
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. OBSTRUCTION 97 four feet, and since moisture can rise to heights of from at least three to five feet in fine textured subsoils below the root zone, it is reasonable to assume that a crop growing on a silt loam having a deep silty clay subsoil draws its moisture supply from six to nine feet of soil during a di ought. Compactness.—Compactness or firmness means good contact. Fig 41.—Capillary rise of water in soils. I between the soil grains and crumbs within the seed bed. Since capillary rise of water is possible because of the films which extend from soil particle to soil particle, we can readily understand how compactness or good contact between the soil grains facihtates this movement of water. Obstruction.—^Under field conditions practically the only obstruction that may at times interfere with the rise of soil water is too much coarse material plowed under; it may be too much coarse manure or litter, a rank growth of clover, or too much 7. 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 Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
