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这是研究尿素及加二氰二酰胺(DCD)处理的尿素在砂壤土中的硝化作用及氨挥发的报告。室内研究表明.20PP~mDCD(占土壤)有效地抑制尿素的硝化作用达60多天。如果尿素经 DCD 处理,土壤中氨散发(时间)延长达105天,而单独的尿素(处理),则15天以后氨挥发就微不足道了。田间试验表明,经 DCD 处理的尿素如果施在地表.DCD 将起增大氨挥发损失的作用;如果施入5cm 深土体内,其损失可被缩至最小。所以,硝化抑制剂(DCD)必须与一定施用技术结合在一起,才育可能发挥出效益.
This is a report on the nitrification and ammonia volatilization of urea in sandy loam soil with urea and dicyandiamide (DCD). Laboratory studies show that 20PP ~ mDCD (accounting for soil) effectively inhibits the nitration of urea for more than 60 days. If the urea was DCD treated, the ammonia emission (time) in the soil was extended by 105 days, while with urea alone (treatment), ammonia volatilization was negligible after 15 days. Field experiments showed that if DCD-treated urea was applied to the surface, DCD would increase the loss of ammonia volatilization, and its loss could be minimized if it was applied to 5cm deep soil. Therefore, nitrification inhibitors (DCDs) must be combined with certain application techniques before they can exert their benefits.