. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. TYPES OF FARMING 319. Fig. 211.—" Hungry soil.'* Sand. To'left, unfertilized. Yield of potatoes, thirteen bushels per acre. Yield of corn, three bushels per acre. (Wisconsin Station.). 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