. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. NITROGEN FIXATION BY NODULE BACTERIA 177 '\. ^.«.«.*^ Jma Fig. 117.—Crimson clover nodules. (U. S. D. A.). 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