1. Dep. of Food Systems and Bioengineering Univ. of Missouri 158 Agricultural Engineering Bldg. Columbia MO 65211
2. Cropping Systems and Water Quality Research Unit, U.S. Dep. of Agriculture‐Agricultural Research Service, 269 Agricultural Engineering Bldg. Univ. of Missouri Columbia MO 65211
3. Dep. of Food Systems and Bioengineering Univ. of Missouri 251 Agricultural Engineering Bldg. Columbia MO 65211
4. Dep. of Agricultural and Applied Economics Univ. of Missouri 223 Mumford Hall Columbia MO 65211