. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. MORE PLANT-FOOD ELEMENTS BECOME AVAILABLE 111 supply of moisture in a well-drained soil than in a wet one—all on account of more and deeper roots. Not only are plants able to secure more water when they develop deep roots, but they are able, also, to secure more of the plant-food elements. 3. Soil Organisms Develop Better.—Water-soaked soils are practically devoid of helpful organisms, while those well drained are usually abundantly suppHed with them (Chapter VII).. Fig. 46.—Wet and cold s
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. MORE PLANT-FOOD ELEMENTS BECOME AVAILABLE 111 supply of moisture in a well-drained soil than in a wet one—all on account of more and deeper roots. Not only are plants able to secure more water when they develop deep roots, but they are able, also, to secure more of the plant-food elements. 3. Soil Organisms Develop Better.—Water-soaked soils are practically devoid of helpful organisms, while those well drained are usually abundantly suppHed with them (Chapter VII).. Fig. 46.—Wet and cold subsoil ixijuied the corn crop. For many years nobody sus- pected that seepage water was the cause of poor corn crops on a large portion of this field even though heavy applications of manure were made. To the left, good corn; to right, injured corn. (See Fig. 39.) 4. Injurious Substances May be Removed.—Proper dramage may be the means of getting rid of certain injurious substances in soils. In some wet marshes, acids have accumulated to such an extent that the soils have become extremely acid in character. When such soils are drained, the accumulated acids are leached out, sometimes almost completely, during the first three or fou/years after thorough drainage has been established. The thorough drainage of alkali spots is the best treatment recommended. Drainage is the method sometimes used to elimi- nate injurious salts from alkali soils (Chapter IV). 5. More Plant-food Elements Become Available.—The entrance of more air in the soil, a warmer soil, the development of. 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
