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从土壤—作物系统中研究氮素利用与平衡特点,以及高产与环境改善的要求,研究适宜的土壤背景氮和适宜的施氮量,对于降低氮素面源污染具有十分重要的理论与实践意义。
Studying the characteristics of nitrogen use and balance, the requirements of high yield and environmental improvement from soil-crop system, and studying the suitable background nitrogen and proper nitrogen application rate have very important theoretical and practical significance for reducing nitrogen non-point source pollution .