【摘要】 氮是植物必需的营养元素和作物产量的主要限制因子。但是 ,农田中过量施用氮素却可导致环境污染。本文综述了农田生态系统中土壤氮素的各种行为 ,特别是各种形态氮素的转化和氮肥的主要去向 ,并概述了氮肥施用的新技术 ,指出了氮素研究中存在的主要问题以及前景更多还原

【Abstract】 Nitrogen is an essential element to plant growth and a key factor to limit crop yield,and surplus nitrogen may lead to environmental pollution.This paper summarizes various N behaviors in soils,particularly,the transformation and main fate of fertilizer N in soil plant system.The new techniques of nitrogen application are also introduced.Also,the problems as well as prospects in N research are put forward in this paper.更多还原