1. Dep. of Food Systems & Bioengineering; Univ. of Missouri; 158 Agricultural Engineering Bldg. Columbia MO 65211
2. Dep. of Plants, Soils, and Climate; Utah State Univ.; 4820 Old Main Hill Logan UT 84322
3. USDA-ARS; Cropping Systems and Water Quality Research Unit; 269 Agricultural Engineering Bldg. Univ. of Missouri Columbia MO 65211