. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. FiQ. 91.—A spading disk.. FiQ. 92.—The smoothing harrow. (Drag.) harrow half to get best results in pulverizing fall plowed lands, sod or lumpy soil—except when two disk harrows are used in tandem. The degree of pulverization depends upon the angle at which the disks are set.. 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 wo
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. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. FiQ. 91.—A spading disk.. FiQ. 92.—The smoothing harrow. (Drag.) harrow half to get best results in pulverizing fall plowed lands, sod or lumpy soil—except when two disk harrows are used in tandem. The degree of pulverization depends upon the angle at which the disks are set.. 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 work.. Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company