英文文献：Nitrogen abatement cost comparison for cropping systems under alternative management choices-不同管理选择下的种植制度氮素减少成本比较
英文文献作者：Amon-Armah, Frederick,Yiridoe, Emmanuel K.,Hebb, Dale,Jamieson, Rob
英文文献摘要：
There is a need for cost-effective methods to reduce nitrogen pollution from agriculture. Marginal abatement cost (MAC) curves for nitrate-nitrogen pollution in an agricultural watershed are evaluated using estimated crop yield and nitrate pollution production functions for alternative cropping systems. The cropping systems considered in this study included i) two grain corn-based cropping systems; ii) two potato-based cropping systems; and iii) a vegetable-horticulture system, managed under conventional tillage (CT) and no-till (NT). The cost-effective potato-based cropping system which met the Health Canada maximum contaminant limit (MCL) for nitrate-N, with the highest gross margin ($6973 ha-1) and lowest abatement cost ($395 ha-1) was a potato-barley-winter wheat-potato-corn rotation under no-till (PBWPC-NT). Similarly, among the vegetable-horticulture cropping systems, potato-winter wheat-carrot-corn rotation under CT (PWRC-CT) generated the highest gross margin and lowest on-farm abatement cost ($680 ha-1). As the Health Canada allowable limit on nitrate-N pollution was relaxed (i.e., less stringent), the cost-effective corn-based cropping system shifted from a rotation involving corn-corn-alfalfa-alfalfa-alfalfa under CT to corn-corn-corn-alfalfa-alfalfa under NT.

有必要采用具有成本效益的方法来减少来自农业的氮污染。利用作物产量估计值和替代性种植制度的硝酸盐污染生产函数，对农业流域的硝酸盐-氮污染边际消减成本(MAC)曲线进行了评价。本研究考虑的种植制度包括:一)两种谷粒玉米为主的种植制度;ii)两种马铃薯种植系统;iii)在常规耕作(CT)和免耕(NT)下管理的蔬菜园艺系统。符合加拿大卫生部对硝酸盐- n的最大污染物限制(MCL)、具有最高毛利率(6973美元ha-1)和最低减排成本(395美元ha-1)的成本效益的马铃薯种植系统是免耕(PBWPC-NT)下的马铃薯-大麦-冬小麦-马铃薯-玉米轮作。同样，在蔬菜园艺种植系统中，CT (PWRC-CT)下的马铃薯-冬小麦-胡萝卜-玉米轮作产生了最高的毛利率和最低的农场削减成本(680美元ha-1)。随着加拿大卫生部对硝酸盐- n污染的允许限制被放宽(即不那么严格)，成本效益高的以玉米为基础的种植制度从CT下的玉米-玉米-紫花苜蓿-紫花苜蓿轮作转变为NT下的玉米-玉米-玉米-紫花苜蓿-紫花苜蓿轮作。