1. Dep. of Crop & Soil Sciences Univ. of Georgia Tifton GA 31793 USA
2. USDA‐ARS National Sedimentation Laboratory Oxford MS 38655 USA
3. Director, Mississippi Water Resource Research Institute Mississippi State MS 39762 USA
4. Dep. of Plant & Soil Science Mississippi State Univ. Mississippi State MS 39762 USA
5. Delta Research and Extension Center, Dep. of Plant & Soil Science Mississippi State Univ. Stoneville MS 38776 USA