Nitrogen migration and fertilizer nitrogen utilization in paddy field under water saving irrigation
1. Huai′an Investigation and Design Institute of Water Conservancy, Huai′an, Jiangsu 223005, China; 2. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3. Suqian City Economic Development Corporation, Suqian, Jiangsu 223800, China
Abstract：To explore the migration and transformation mechanism of nitrogen in soil, plant and atmosphere continuum (SPAC), based on the comparative experiments and combined with the isotope N15 tracer technique, the mechanism of nitrogen migration and transformation and the trend of fertilizer nitrogen utilization under different irrigation modes were investigated. The results show that the watersaving irrigation modes (thin and wet irrigation of W1 and intermittent irrigation of W2) can effectively reduce the NO3-N leaching loss of fertilizer nitrogen. For the same amounts of fertilizer, the watersaving irrigation mode can significantly reduce the total amount of ammonia (NH3) volatilization and the proportion of NH3 volatilization of fertilizer nitrogen in total NH3 volatilization, and the nitrogen uptake of rice plants can be significantly increased. The watersaving irrigation mode can reduce the residual rate of fertilizer nitrogen in soil by 14.6%. Compared with W0, the nitrogen fertilizer utilization rates of W1 and W2 are increased by 9.2% and 14.2%, respectively.
