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涂层尿素是一种化肥新品种，其特点是在普通尿素表面，涂一层以胶态物质和作物生长必须的微量元素为主要成份的涂层溶液经干固而成，可以大幅度提高肥效。为了大面积推广应用涂层尿素，需摸清涂层尿素的氮素利用率，投入产出比等情况。为此，1997年按省土肥总站下达的实施方案?
Coated urea is a new variety of fertilizers, which is characterized by ordinary urea surface, coated with a layer of colloidal substances and crop growth essential trace elements as the main component of the coating solution is dry solid, which can greatly improve fertilizer . In order to popularize the application of coated urea in a large area, it is necessary to find out the nitrogen utilization rate and input-output ratio of coated urea. To this end, in 1997 by the Provincial Fertilizer Station issued the implementation of the program?