不同氮肥施在石灰性土壤上氨挥发的研究

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。

THE VOLATILIZATION OF AMMONIA FROM DIFFERENT KINDS OF NITROGEN-FERTILIZER APPLIED ON THE SURFACE OF CALCAREOUS SOIL

In order to determine ammonia volatilization loss from surface bro- adcast of NH_4HCO_3,(NH_4)_2SO_4 and CO(NH_2)_2 on calcareous soil with pH7.6 some model tests have been carried out in the laboratory of Beijing Agricultural University. The results indicate that all these three kinds of Nitrogen fertilizers tested lead to obvious volatilization loss of NH_3 in the sequence of NH_4HCO_3>(NH_4)_2SO_4>CO(NH_2)_2.NH_4HCO_3 is an unstable compound,Its total loss was the largest in the period of test for two we...