. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. A Fig 113 —Other soil orgamsms A, a common mold; S, yeast plants. of an inch in diameter, and it is believed that some are too small to be seen with the aid of the most powerful microscope. In one-third of a thimbleful (one gram) of normal field soil have been counted from 140,000,000 to 400,000,000 microorganisms; and in manured soil, as high as 750,000,000. The most tiny ones (bacteria) are in greatest abundance, and it is they which play a large part in nature's plans, and sta
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. A Fig 113 —Other soil orgamsms A, a common mold; S, yeast plants. of an inch in diameter, and it is believed that some are too small to be seen with the aid of the most powerful microscope. In one-third of a thimbleful (one gram) of normal field soil have been counted from 140,000,000 to 400,000,000 microorganisms; and in manured soil, as high as 750,000,000. The most tiny ones (bacteria) are in greatest abundance, and it is they which play a large part in nature's plans, and stand in close relationship to the practices which make possible successful crop production. In this chapter will be considered in particular three groups of the helpful soil organisms, viz.: (a) Those which cause decomposi- tion or decay; (6) those which cause nitrification, and (c) those which gather nitrogen from the air. ORGANISMS OF DECOMPOSITION Microorganisms Clear the World of Trash (Fig. 114-A).— What would this world be were it not for the fact that all plants 171. 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
