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Study on the agro-chemical characteristics and utilization of high-efficiency polymer-coated urea:

Wang Jiayu 1 ,Zheng Jici 1 ,Shi Danchao 2 ,Wang Qingquan 3 ,Yu Jianhua 4 ,Wang Guoliang 5 & Li Shunhua 6 ( 1 Zhejiang Academy of Agricultural Sciences, Hangzhou 310021; 2 Yuhang Institute of Agricultural Sciences, Yuh  
A series of experimental studies including five sites field experiments and field microplot experiments, 15 N tracer experiments, large lysimeter test as well as laboratory experiment were conducted at six locations in Zhejiang ricefields in 1994 to determine the effect of high efficiency polymer-coated urea (SUN) on rice yield and its mechanism as well as the effect of SUN on the recovery, productive efficiency, ammonia volatilization loss and leaching loss as compared with common urea. The result indicated that there is a high significant enhance effect on rice grain yield by using SUN and a reducing effect on the nitrogen losses (both NH 3 volatilization and NO - 3 leaching) of urea as comparison with common urea. Therefore, SUN may be of benefit to fertilizer economy and environment conservation.
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