. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. PROFITS DETERMINE USE OF FERTILIZERS 207 the one crop to which it is applied. Though it may be good business practice to apply fertilizers to a crop and increase the net profits, yet it is still better practice to accomplish this in such a way as to effect a more permanent improvement of the soil, which will serve to benefit several crops in succeeding seasons. Profits Determine Use of Fertilizers.—The use of commercial fertilizers depends mainly upon whether or not the value of the increa
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. PROFITS DETERMINE USE OF FERTILIZERS 207 the one crop to which it is applied. Though it may be good business practice to apply fertilizers to a crop and increase the net profits, yet it is still better practice to accomplish this in such a way as to effect a more permanent improvement of the soil, which will serve to benefit several crops in succeeding seasons. Profits Determine Use of Fertilizers.—The use of commercial fertilizers depends mainly upon whether or not the value of the increased yields more than offset the cost of the application (Figs. 137 and 138). On many soils the use of commercial fertilizers does not pay (Fig. 139). The best returns from fertilizers are. Fig. 139.—Corn stimulated by complete fertilizer applied in the hill (125 pounds per acre). No appreciable difference in yield at harvest time. Soil in good state of fertility. (See page 208.) obtained when soils are sufficiently supplied with moisture and organic matter (compare Figs. 140 and 141). The cost of fertilizers varies in different sections, depending largely upon the distance from distributing centers. Fertilizers are usually purchased on the unit basis. One per cent of a ton, or twenty pounds, is called a unit. Normal prices for nitrogen have been about three dollars per unit; phosphoric acid (P2O5) from twenty to forty-five cents in rock phosphate, and about one dollar in soluble phosphates; and potash about one dollar to one dollar and forty cents per unit. The World War had a decided effect on fertilizer prices. The price paid for ammonia was six to seven dollars per unit; soluble. 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
