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Optimal nitrogen application for the north rimland of double-cropping rice

WU Wen-ge1,2,XU Jun2,YUAN Gong-ping3,WANG Shi-qing4,CHENG Kai-qing4,LI Ze-fu1,CHEN Zhou-qian1(1.Institute of Rice Science,Anhui Agriculture Academy,Hefei 230031;2.Agricultural College,Yangzhou University,Yangzhou 225009;3.Agricultural Technology Extension Center of Huaining County,Gaohe 246112;4.Huaining Agriculture Institute,Huanglong 246113)  
Two early indica rice cultivars of Xiangliangyou 68 and Zaoxian 65 were used to study growth characters,yield and its components under the condition of the total applied nitrogen amount of 180 kg·hm-2 and different nitrogen fertilizer operations in the all growth stages.The results were as follows:it′s necessary that dressing nitrogen fertilizer at panicle initiation stage for the north rimland of double-cropping early rice,the proper proportion of ear dressing was about 25%(from 20%to 30%),recommend technology of nitrogen application correct balance between basal∶tillering dressing∶ear dressing was 50∶25∶25.The main benefit of this nitrogen application was related to its improved splitting and timing of fertilizer N applications leading to a more balanced supply of N nutrition for rice growth than the common fertilizer practice,improved rice population substantially and increased rice yield significantly.
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