By A.G. Norman (Ed.)
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Extra resources for Advances in Agronomy, Vol. 17
Much of that going into fertilizers is used for liquid mixes, where an acid of high purity is desirable. , use their furnace acid almost entirely for nonfertilizer purposes. Increasing competitiveness of wet-process acid coupled with adequate supplies of low-cost sulfur 37 ADVANCES IN FERTILIZERS apparently assures that furnace acid will not become a major factor in fertilizer manufacture in the immediate future. If large blocks of lowcost hydro power should become available at sites of major phosphate deposits, as recently has been proposed in the western United States, the position of furnace acid for fertilizer production could improve markedly.
Other processes and process modifications are practiced to a limited extent. The ammonia may be either by-product, mainly from coke ovens, or synthetic. About one-sixth of the world production of ammonium sulfate uses by-product ammonia and the remainder synthetic, with production from the latter gaining over by-product sources. The final product contains around 21 per cent N and 24 per cent s. Ammonium sulfate continued until 1959-1960 as the largest single nitrogen material produced over the world (FAO, 1963).
Production has risen steadily, averaging an increase of 6 per cent per year over the past 15 years. R. 6 per cent of the world output. 3 per cent originates from the Pacific Islands and Christmas Island in the Indian Ocean. The remaining 5 per cent comes largely from Vietnam, South Africa, South America, and China. ADVANCES I N FERTILIZERS 31 Existence of large phosphate deposits in many parts of the world has been known for years, but only recently has prospecting become widespread with a view to exploitation.
Advances in Agronomy, Vol. 17 by A.G. Norman (Ed.)