Effects of Nitrogen Fertilizer Management on Dry Matter Production and Yield Formation in Hybrid Rice Cultivar Chuanxiang 9838

To explore the effects of nitrogen fertilizer management on dry matter production and yield formation in hybrid rice cultivar Chuanxiang 9838,using the hybrid rice cultivar Chuanxiang 9838as experimental material,the authors designed three kinds of N applications and four nitrogen management methods,to carry out the effects of different nitrogen fertilizer management patterns on stem tillers growth,dry matter accumulation and yield formation.Results:as N application rate increased,the tiller numbers per area at different growth stage increased,the rate of productive tillers were A2 A1 A3, the dry matter accumulation at heading and maturing stage were significantly increased,harvest index were A2 A1A3,the yield first increased and then decreased,and reached the highest yield 651.59kg/m2 on average when the N application rate was 10kg/667m2.Application of panicle fertilizer can significantly increase the yield,the highest yield came out when the ratio of basal and tiller fertilizer to panicle fertilizer was 6:4.The yield reached 620.81kg/667m2,651.59kg/667m2 and 636.18kg/667m2 respectively when N application amount was 7kg/667m2,10kg/667m2and 13kg/667m2,and it was optimum to apply earing fertilizer in the third stage of panicle differentiation period.