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本文对碳酸氢铵、硫铵、尿素在北京地区石灰性土壤上表施造成的氨挥发损失的累积量和速率进行了研究,结果表明三者都存在着明显的不同程度的氮素损失。其顺序:碳酸氢铵>硫铵>尿素。在供试条件下,对三种氮肥的挥发累积量随时间变化的关系分别用幂函数和指数方程的数学式加以模拟。以及不同施肥方法氮素损失量的比较研究,三种氮肥均以施入土表5cm 以下为最少。而浅施1cm和表施后立即浇水仅可不同程度地减少挥发损失。
In this paper, the accumulative amount and rate of ammonia volatilization loss caused by ammonium bicarbonate, ammonium sulfate and urea on calcareous soils in Beijing area were studied. The results show that there are obvious nitrogen losses in all three. The order: ammonium bicarbonate> ammonium sulfate> urea. Under the conditions of the test, the relationship between the cumulative cumulant amount of three nitrogenous fertilizers with time was simulated respectively by the power function and exponential equation. As well as the comparison of the nitrogen loss of different fertilization methods, the three nitrogen fertilizers were all applied less than 5cm in soil table. The shallow Shi 1cm and immediately after the surface watering can only reduce the volatile loss to varying degrees.