求一篇关于土壤氮素的英文文献综述

求一篇关于土壤氮素的英文文献综述，篇幅不要太长，但一定是要综述啊！在此跪谢！！！！

Environmental and economic issues combined have increased the need to better understand the role and fate of nitrogen (N) in crop production systems. Nitrogen is the nutrient most often deficient for crop production in Minnesota and its use can result in substantial economic return for farmers. However, when N inputs to the soil system exceed crop needs, there is a possibility that excessive amounts of nitrate (NO 3 - ) may enter either ground or surface water.

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