Abstract: To investigate the effects of grain fertilizer on rice yield and nitrogen absorption and utilization efficiency,the early rice Zhuliangyou 819 and Luliangyou 996, the late rice Xiangwanxian 13 and Yuzhenxiang were used as materials,and five nitrogen application levels （CK no fertilizer, F1 grain fertilizer, F2 no grain fertilizer, F3 grain fertilizer at full heading stage, F4 grain fertilizer at grain filling stage） were set to analyze rice yield, yield composition, and nitrogen absorption and utilization efficiency among different treatments. The results showed that on the basis of basal tillering and panicle fertilizer adding grain fertilizer or applying grain fertilizer alone had certain effect of increasing yield, in which the average yield of grain fertilizer（F1） increased by 24.84%. The average yield increase was 9.95% and 5.06% grain fertilizer was applied alone at full heading stage and grain filling stage, respectively. The application of grain fertilizer achieved high yield by coordinating 1 000-grain weight and seed setting rate on the premise of increasing grain number per panicle of rice, and the effect of grain fertilizer on yield increase could be as high as 8.22%. Increasing grain fertilizer application had a better effect on maintaining nitrogen absorption and utilization efficiency and nitrogen accumulation in the late growth period of rice. In the process of rice cultivation, increasing grain fertilizer at full heading stage can promote the increase of grain number per panicle and the absorption and utilization of nitrogen to achieve a high yield of rice.

Key words: grain fertilizer, yield, nitrogen management, nitrogen efficiency