1. USDA‐ARS Southeast Watershed Research Lab. Tifton GA 31793‐5737
2. Dep. of Biosystems and Agricultural Engineering Univ. of Minnesota St. Paul MN 55108‐6005
3. Southwestern Research and Outreach Center and Dep. of Soil, Water, and Climate Univ. of Minnesota Lamberton MN 56152‐1326
4. Dep. of Agronomy and Plant Genetics Univ. of Minnesota St. Paul MN 55108‐6026