Advances in Agronomy, Vol. 17 by A.G. Norman (Ed.)

By A.G. Norman (Ed.)

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S. Patent No. 3,061,423). Possibilities may exist, however, for achieving slow release through low-cost coatings and for use of biochemical inhibitors. Urea-formaldehyde is produced by reaction of urea with formaldehyde in aqueous solution. NH CH, OH, which further reacts to form a series of condensation products. The proportions of the various compounds formed vary with the mole ratio of urea to formaldehyde used and the reaction temperature, Thus the material is a mixture of inethylene urea polymers having a range of molecular weights and a range of solubilities in water solutions.

R. Consumption has increased rapidly-21,000 short tons in 1957; 172,000 tons in 1961; and 294,000 tons in 1962. Aqua ammonia use is concentrated around plants which produce nitrogenous fertilizers and have an excess of ammonia. Aqua ammonia is made by dissolving anhydrous ammonia in water. It is usually produced in the small plants of mixers and distributors, but some is made at the locations of ammonia plants. Aqua ammonia is stored under low pressure and distributed directly to farmers in the immediate area.

5 million tons. 5 per cent Pz05) material. The deposits are both underground and open-pit mined, and the mined material is beneficiated. 2 million short tons annually and is the fourth largest phosphate rock-producing country. Deposits apparently are somewhat similar to those in Morocco, but of lower grade. Deposits in Algeria, Egypt, Senegal, Jordan, and Israel also lie in about the same geological horizon as the Moroccan deposits. The Pacific Islands, including Nauru, Makatea, and Ocean Island, and Christmas Island in the Indian Ocean presently are important sources of phosphate rock.

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