1. Dep. of Soil Environmental and Atmospheric Sciences; Agricultural Engineering Building; Univ. of Missouri; Columbia MO 65211
2. USDA-ARS Cropping Systems and Water Quality Unit, Agricultural Engineering Building; Univ. of Missouri; Columbia MO 65211
3. Division of Plant Sciences, Agriculture Building; Univ. of Missouri; Columbia MO 65211
4. Dep. of Soil Environmental and Atmospheric Sciences, Anheuser-Busch Natural Resources Building; Univ. of Missouri; Columbia MO 65211