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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。
In this paper, the process and quantity of ammonia volatilization loss on paddy soil in red soil, resin coated urea (controlled release N fertilizer) and common urea were studied. The results showed that: ① 2 ~ 4 days after basal application and 1 ~ 2 days after top dressing, the ammonia volatilization flux of controlled release N fertilizer decreased compared with common urea treatment, with the decreasing rates of 28.57% and 25.00% respectively; The peaks of ammonia volatilization appeared in the fifth day after basal application and the fourth day after dressing, both of which lagged the average urea treatment. After 2 days of top dressing, ammonia volatilization flux of controlled release N fertilizer was significantly higher than that of ordinary urea treatment. Therefore, only by taking a reasonable basis of infrastructure, controlled release of N fertilizer can play a greater environmental benefits than ordinary urea.