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《Chinese Journal of Soil Science》 2007-03
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Effect of Nitrogen Management on Grain Yield and Nitrogen Utilization under the System of Intensified Rice Cultivation

YANG Xiang-tian1,LIN Xian-qing2,ZEND Xiao-yuan,WANG Xu-hui,LUO Shan-zhuo(1.Inititute of Ecology of Taizhou Agricultural Academy,Linhai 317000, China;2.China National Rice Research Institute,Hangzhou 310006,China)  
The experiment of rice intensification system(SRI) was carried out using super hybrid rice(Zhongzheyou 1) as material to investigate the grain yield and nitrogen utilization under different nitrogen managements.The results showed: the grain yield of SRI was 11.1%-15.2% greater than that of CK,and the assimilation efficiency,agronomic efficiency,and physiological efficiency of nitrogen fertilizer were 5.3%-26.9%,67.2%-92.2%,and 6.0%-80.5% greater than those of CK,respectively.Hence,nitrogen utilization efficiency,and eliminated accumulation of N fertilizer and its impact on the environment were enhanced under the system of rice intensification.Moreover,the high-yield mechanism of N fertilizer management under the system of rice intensification was discussed in the paper.
【Key Words】: The system of rice intensification N fertilizer management Grain yield Nitrogen utility
【CateGory Index】: S511
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