典型红壤区稻田树脂包膜控释氮肥氨挥发研究

本文研究了红壤水稻土上,树脂包膜尿素(控释N肥)和普通尿素施用后氨挥发损失的过程及数量。结果表明:①基施后2～4天内和追施后的1～2天内,控释N肥氨挥发通量相对普通尿素处理均有下降,下降幅度分别为28.57%和25.00%;控释N肥氨挥发峰值分别于基肥后第5天和追肥后第4天出现,均滞后于普通尿素处理。②追肥2天后,控释N肥氨挥发通量极显著高于普通尿素处理。因此,只有采取合理的基施方式,控释N肥才能比普通尿素发挥更大的环境效益。

Ammonia volatilization of controlled-release urea enveloped with colophony from paddy field in typical red soil

The ammonia volatilizations were studied from red paddy soil under the treatments of controlled-release urea enveloped with colophony (CN) and common urea (UN). The results indicate that: 1) Ammonia volatilization flux of CN treatment decreased by 28.57% in 2 - 4 d in base N phase and by 25.00% in 1 - 2 d in dress N phase; and the peak volatile values occurred at the 5th d in base N phase and the 4th d in dressing N phase, and both were later than UN treatment. 2) Ammonia volatilization flux of CN treatment increased greatly after 2d in the dressing N phase than UN treatment. Therefore, the reasonable pattern of basal CN fertilization should be adopted to get the better environment benefit.