On monoculture and the structure of crop rotations

被引:48
|
作者
Hennessy, David A. [1 ]
机构
[1] Iowa State Univ, Dept Econ, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Econ, Ames, IA 50011 USA
关键词
ethanol jointness; quasi-convexity; rotation algebra; specialization;
D O I
10.1111/j.1467-8276.2006.00905.x
中图分类号
F3 [农业经济];
学科分类号
0202 ; 020205 ; 1203 ;
摘要
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.
引用
收藏
页码:900 / 914
页数:15
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