Nitrogen fertilizer was applied to increase the yield of rice, which is an indisputable fact. As the most important nutrient element in rice, nitrogen plays an important role about its absorption, transportation and utilization of nutrient elements in rice. We introduced the significance of nitrogen fertilizer in rice in this review, combined with the latest research on nitrogen nutrition of rice, analyzed the absorption and assimilation process of ammonium and nitrate in rice plants. We also discussed the restriction factors of nitrogen use efficiency. Valuable outlook on how to improve nitrogen use efficiency of rice has been provided, and nitrogen fertilizer must be applied with a rational and efficient way. We also hope that this summary will offer a theoretical basis for reasonable application of nitrogen fertilizer and nutrition research on rice.
ricenitrogenabsorption and utilizationnitrogen use efficiencyammonium nitrogennitrate nitrogen