采用大田小区试验法，研究控释尿素减量施用对冬小麦和夏玉米产量、氮肥利用率的影响。经过3年的试验，结果表明，控释尿素习惯用量减少20％、40％均能提高冬小麦、夏玉米的氮肥利用率。控释尿素用量减少20％，在试验的第一年，冬小麦、夏玉米籽粒产量没有显著降低，在随后的两年，冬小麦产量基本不变，夏玉米产量有所下降。%The effects of decreasing controlled -release urea application rate on grain yield and nitrogen use efficiency of winter wheat and summer maize were studied through field plot experiment for three years. The results indicated that the nitrogen use efficiency of winter wheat and summer maize could be improved through decreasing controlled -release urea application rate by both 20% and 40%.When the controlled -re-lease urea application rate decreased by 20%,in the first year,the grain yield of winter wheat and summer maize did not significantly decreased;during the next two years,the grain yield of winter wheat was almost in-variant,while that of summer maize declined.
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