1. Dep. of Agronomy Purdue Univ. West Lafayette IN 47907
2. Delta Research and Extension Center Mississippi State Univ. Stoneville MS 38776
3. Monsanto Learning Center Scott MS 38772
4. Dep. of Plant and Soil Sciences Mississippi State Univ. Starkville MS 39762
5. Mississippi Water Resources Research Inst. Mississippi State Univ. Starkville MS 39762