| Using Wuyujing 3 and Shanyou 63 as experiment materials, this article studies the effects of water and nitrogen on nitrogen utilization and nutrient uptake of rice at late stage. The results show: with the rise of nitrogen application, the plant nitrogen uptake and the nitrogen remained in straw are increased, while the nitrogen dry matter production efficiency (NDMPE), the nitrogen grain production efficiency (NGPE) and the nitrogen transportation efficiency (NTE) of rice are reduced; Nitrogen fertilizer can improve the P and K uptake of rice; Water stress can lower the nitrogen uptake ability of plants, but increase the NDMPE, the NGPE and the NTE of vegetative organs; Water stress can lower the P and K uptake amount of plants, but raise the use efficiency of P; There is an obvious interaction between water and nitrogen, therefore, under certain nitrogen application condition, a moderate water stress is beneficial to raise the nitrogen use efficiency and reduce the nitrogen loss as well as to get a satisfactory yield of rice. |