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Effects of Different Ratio of Base N to Dressed N and Type of Nitrogen Fertilizer on Maize Yield and Nitrogen Use Efficiency in Fluvio-aquic Soil Region

LI Bing-qi1,SUN Ke-gang1,HE Ai-ling1,GAO Guo-hua2(1.Institute of Plant Nutrition,Agricultural Resources and Environmental Science,Henan Academy of AgriculturalSciences,Zhengzhou 450002,China;2.Yexian Agro-technical Popularization Center,Yexian 467200,Chian)  
The experiment of different ratio of base N to dressed N and type of nitrogen fertilizer on maize yield and nitrogen use efficiency was conducted.The results showed that the best treatment was N33.3%+N33.3%+N33.3%(N33.3% as basal and N33.3% top-dressed,and N33.3% green up-dressed)with the maize yield reached to 8668 kg/ha,the second maize yield was 8512 kg/ha with BB fertilizer,the third maize yield was 8390 kg/ha of controlled-release urea.There's no significant difference among the three treatments.Nitrogen use efficiency of BB fertilizer and controlled-release urea were better than N33.3%+ N33.3%+N33.3%.Nitrogen use efficiency of N33.3%+N33.3%+N33.3% was the highest among treatments of base to dressing ratio of nitrogen fertilizer.
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