On Monoculture and the Structure of Crop Rotations
研究轮作选择中产量提升和投入节省的持续效应，利用选择函数的拟凸性推导价格独立和价格依赖的轮作结构原则，并用爱荷华州玉米-大豆轮作数据验证记忆长度，模拟支持不同轮作的价格和补贴水平。
An issue when seeking to identify rotation choice is persistence in yield‐enhancement and input‐saving carry‐over effects. Focusing on carry‐over length and the monoculture decision, we use quasi‐convexity of choice functions to develop price‐independent and price‐dependent principles concerning rotation structure. Iowa corn‐soybean rotation data suggest corn has one‐year memory. For corn, soybeans in the prior year is yield increasing (16.5 bu./ac.) and nitrogen saving (51 lb./ac.). The hypothesis that soybean has two‐year memory cannot be rejected. Corn in the prior year (two years) increases yield by 7 bu./ac. (11.6 bu./ac.). We simulate to find price and practice subsidy levels that support different rotations.