中文摘要：

本文通过对化肥使用的收益成本分析及其对环境造成的影响，利用二次生产函数模型，以洞庭湖区农民的化肥投入为案例，分别考虑粮食产量最大、农民经济收益最大和净经济效益最大3种情况的化肥投入量，进而提出化肥控制和管理对策的最佳管理措施建议。

英文摘要：

This article study on the cost-effectiveness analysis and the environmental impact of chemical fertilizer, using secondary production function model to the case of farmer＇ s application of chemical fertilizer in the Dongting Lake area. Considering the application amount of chemical fertilizer in three situations：the biggest output of food production,farmer＇ s largest economic benefit, net value of the most cost-effectiveness. And then put forward some best management practice suggestions in eontroling and managing chemical fertilizer.