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.