农业非点源污染的评价是农田管理和水质控制的基础工作，对实施农田最佳管理措施具有指导意义。

Agricultural non point source pollution assessment is the basis of field management and water pollution control, which is significant when carrying out best management practices to farm ecosystems.

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因此，对最佳管理措施在控制农业非点源污染中的成本与效益进行经济分析和评价，是十分必要的。

So it is necessary to analyze and evaluate the cost and benefit of BMPs applied in agricultural non-point source pollution prevention.

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河岸缓冲区对氮素的有效截留以阻止其进入河流已得到广泛的认可，是美国资源局所认可的一种最佳管理措施。

Riparian buffers are widely accepted to be an effective means of buffering rivers against nitrogen and thus are considered a best management practice(BMP) by State and Federal resource agencies, U.

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