. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 178 SOIL ORGANISMS IN RELATION TO SOIL FERTILITY nitrogen from the soil air and converting it into a form suitable for the plant (Figs. 114-C, 116, 117, 118 and 119). There are three main differences between legumes and other plants: (a) They are very rich in nitrogen; (b) they usually have nodules on their roots, and (c) they may increase the nitrogen supply of the soil through the action of the nodule bacteria. Nodule organisms are also called ^^ symbiotic bacteria.'^ They have the power
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 178 SOIL ORGANISMS IN RELATION TO SOIL FERTILITY nitrogen from the soil air and converting it into a form suitable for the plant (Figs. 114-C, 116, 117, 118 and 119). There are three main differences between legumes and other plants: (a) They are very rich in nitrogen; (b) they usually have nodules on their roots, and (c) they may increase the nitrogen supply of the soil through the action of the nodule bacteria. Nodule organisms are also called ^^ symbiotic bacteria.'^ They have the power of independent existence, but when they enter the roots of legumes both the bacteria and plants are benefited by the close association. Nitrogen Fixation by Free Soil Bacteria.—^Aside from the bacteria which cause the formation of nodules, there are bacteria. 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
