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Effects of Nitrogen Management on Grain Yield of Rice in Panxi Region

YONG Yuan-cheng1,YUAN Ji-chao2,YANG Shi-min2,XIE Li2,XIE Bing2,CHEN Zhen2,ZHOU Hong2(1.College of Resource and Environment;2.College of Agriculture,Sichuan Agricultural University,Yaan 625014,Sichuan,China)  
With hybrid India variety Jingyou 527 and Japonica variety Hexi 39 which were extensively used in the area as the material,a field experiment was conducted to study the effect of nitrogen management on grain yield of rice in Panxi region in this paper.The results were:The effects of nitrogen rate on grain yield were more than that of ratio of ear-grain fertilizer.The grain yields were the highest only under the optimum nitrogen rate and optimum ratio of ear-grain fertilizer.However,the optimum nitrogen rate of Japonica variety for high yielding was larger than that of Indica variety,e.g.the sensitivity of Indica rice to nitrogen rate was greater than that of Japonica variety.The quadratic regression equations of grain yield to total nitrogen rate and ratio of ear-grain fertilizer were also established in this paper.The suitable nitrogen rate and ear-grain fertilizer for more than 10.5 t/hm2 grain yield to Jingyou 527 and more than 9.0 t/hm2 grain yield to Hexi 39 were calculated respectively.
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