Research on the Relationship between the Application of Nitrogen and Phosphorus Fertilizer and the Character of Rice Yield

[Objective] The reference for the reasonable fertilization for paddy field in northwestern Xinjiang was provided through the research on the rule of fertilizer need of rice.[Method] The influence of the application amount of nitrogen and phosphorus fertilizer on rice yield and relevant properties were studied with the method of twice saturated D-optimal design and the return equation among nitrogen,phosphorus and rice yield,other properties was set up.[Results] The result showed that the influence of nitrogen fertilization on the number of panicle per plant,number of grain per panicle and yield of rice was higher than phosphorus fertilization.The suitable application amount of nitrogen fertilizer was from 272.12 to 440.98 kg/hm2 and phosphorus fertilizer was from 62.96 to 145.67 kg/hm2.In the optimal range of nitrogen and phosphorus fertilization,the influence of nitrogen fertilization on the number of panicle per plant,number of grain per panicle and yield of rice was higher than phosphorus fertilization and beyond the range,the negative efficiency could be produced.The number of panicle per plant and yield of rice could be promoted in the combination of nitrogen and phosphorus fertilization.[Conclusion] The combination of nitrogen and phosphorus fertilization and soil fertility was important in rice production.