Effects of Controlled Release Fertilizer on Rice Yield,Water and Nitrogen Use Efficiency under Water-saving Irrigation

In order to reveal the effects of controlled release fertilizer on rice yield,water and nitrogen use efficiency under water-saving irrigation,based on filed experiments,this paper analyzed the variation of rice yield,irrigation requirement,water consumption, water and nitrogen use efficiency under water and fertilizer coupling.The results showed that compared with traditional irrigation, water-saving irrigation made the irrigation requirement and water consumption decrease by 55.32% and 33.71%,respectively,the nitrogen uptake increase by 3.13%,water and nitrogen use efficiency increase by 47.23%and 7.54%,respectively.Controlled release fertilizer management reduced the nitrogen uptake and made the nitrogen use efficiency increase by 37.65%.The water and fertilizer coupling management reduced the input of water and nitrogen markedly,while the rice yield did not drop and the nitrogen uptake increased substantially.Compared with traditional water and fertilizer management,water-saving irrigation and controlled release fertilizer management made the water and nitrogen use efficiency increase by 45.31%and 47.73%,respectively.