英文文献：Risk Analysis of Organic Cropping Systems in Minnesota-明尼苏达州有机种植系统的风险分析
英文文献作者：Mahoney, Paul,Olson, Kent D.,Porter, Paul M.,Huggins, David R.,Perillo, Catherine A.,Crookston, R. Kent
英文文献摘要：
When all strategies received conventional market prices, 4-year cropping sequences had greater net returns than 2-year sequences, and the organic input, 4-year strategy had the highest net return. Adding 50% of the estimated organic premium, the 4-year, organic strategy dominated all low- and high-purchased input strategies.

当所有策略都接受常规市场价格时，4年种植序列的净收益大于2年种植序列，其中有机投入4年策略的净收益最高。加上50%的有机溢价，4年有机战略主导了所有低购买和高购买投入战略。