About 40-70% of the applied urea fertilizer is lost to the environment, causing serious pollution. Controlled-release technology is useful in increasing the efficiency of fertilizer urea as well as in checking environment pollution. Four laboratory-level controlled-release urea fertilizers were formulated based on polymers which are soil conditioners and then evaluated for their slow-release property. Urea was coated with the copolymer of acrylamide and divinylbenzene/N,N'-methylenebisacrylamide/tetraethyleneglycol diacrylate or pentaerythritol triacrylate and sealant materials (wax and polystyrene). Urea coated with copolymer of acrylamide-tetraethyleneglycol diacrylate was found to be having a better slow-release property among the systems prepared. (C) 1996 John Wiley & Sons, Inc. [References: 17]
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机译：施用的尿素肥料中约有40-70％损失到环境中，造成严重污染。控释技术可用于提高肥料尿素的效率以及检查环境污染。基于聚合物（土壤改良剂）配制了四种实验室级控释尿素肥料，然后评估了它们的缓释性能。尿素涂有丙烯酰胺和二乙烯基苯/ N，N'-亚甲基双丙烯酰胺/四乙二醇二丙烯酸酯或季戊四醇三丙烯酸酯的共聚物和密封剂材料（蜡和聚苯乙烯）。发现在制备的体系中，用丙烯酰胺-四乙二醇二丙烯酸酯的共聚物涂覆的尿素具有更好的缓释性能。 （C）1996 John Wiley＆Sons，Inc. [参考：17]
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