. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 152 TILTH AND TILLAGE disk harrow is frequently used on fields infested with quack grass, to bring the roots to the surface. It is always best to lap the disk. FiQ. 91.—A spading 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