１９８５～１９９２年在福州、莆田两地，２次进行８年１６个稻作年次定位试验。结果表明，尿素分别与红萍、绿肥、厩肥、稻草配合施用，对稻田土壤物理性状、碳氢平衡、微生物区系、酶活性、供肥能力等生态良性循环有积极的影响；稻谷平均每公顷年产量比等氮量尿素为对照的，增产分别为１０．７％、１１．４％、９．６％、６．５％。取得显著的经济效益和土壤生态效益。 From 1985 to 1992 in Fuzhou, Putian, two times, eight years of 16 years of rice positioning experiments. The results showed that the combined application of urea and red ping, green manure, manure and straw had a positive effect on the ecological virtuous cycle of paddy soil physical properties, hydrocarbon balance, microbial flora, enzyme activity, The annual yield was higher than that of urea nitrogen with the increment of 10.7%, 11.4%, 9.6% and 6.5% respectively. Obtain significant economic benefits and soil ecological benefits.