包膜复合肥施用对夏玉米产量及氮肥利用率的影响

采用随机区组设计了7个施氮水平，以不施氮为对照，研究了包膜复合肥用量及施用方法对夏玉米氮肥利用以及产量的影响。结果表明:增加肥料的用量，夏玉米叶面积指数、干物质积累量、产量及蛋白质产量也显著增加；施氮量相同时，玉米的产量和氮肥利用率均表现为:底施包膜复合肥＞侧施包膜复合肥＞普通尿素；与包膜复合肥侧施相比，底施分别使产量、蛋白质产量和氮肥利用率提高9.6%～12.4%、12.0%～19.0%和16.1%～26.8%。综合分析表明，与普通尿素和复合肥侧施相比，底施包膜复合肥225 kghm2，可显著提高玉米氮肥利用率和产量，是适宜该地区大面积推广的施肥模式。 

The Application of Coated Compound Fertilizer on N Utilization Efficiency and Yield of Summer Maize

No nitrogen as control，seven nitrogen rates were designed to investigate the effects of rates and methods of coated compound fertilizer（CCF）on N utilization efficiency and yield of the summer maize in a randomized design.The result showed that，leaf area index，dry matter accumulation，grain yield and grain protein yield of the summer maize were getting more increase with the increasing of N application rate.At the same nitrogen level，the grain yield and N utilization efficiency all were :bottom application of CCF> side dressing between the rows of CCF>normal urea.And the grain yield，grain protein yield and N utilization efficiency applied with CCF by bottom applying were 9.6%～12.4%，12.0%～19.0%，16.1%～26.8% higher than that applied by side dressing between the rows，respectively.In conclusion，using CCF 225 kg hm2 was benefit to increase the use efficiency of nitrogen，and the yield of maize.