1. Univ. of Arkansas; Dep. of Crop, Soil, and Environ. Sci.; 1366 W. Altheimer Dr. Fayetteville AR 72704
2. Univ. of Arkansas; Agricultural Statistics Lab.; 101 Agricultural Annex Fayetteville AR 72701
3. Univ. of Arkansas; Northeast Research and Extension Center; 1241 W. County Rd. 780 Keiser AR 72351
4. Mississippi State Univ.; North Mississippi Research and Extension Center; 5421 Highway 145 South Verona MS 38879
5. Univ. of Arkansas; Southeast Branch Experiment Station; 140 Experiment Station Loop Watson AR 71674
6. Univ. of Missouri; Div. of Plant Sciences; 1-31 Agriculture Building Columbia MO 65211
7. Mississippi State Univ.; Delta Research and Extension Center; P.O. Box 197, 82 Stoneville Rd. Stoneville MS 38776
8. Texas A&M; Texas AgriLife Extension Service; 370 Olsen Blvd College Station TX 77843
9. Oklahoma State Univ.; 376 Agricultural Hall Stillwater OK 74078
10. Univ. of Tennessee; Dep. of Plant Sci.; West TN AgResearch Center, 605 Airways Blvd Jackson TN 38301
11. Univ. of Missouri
12. Texas Tech Univ.; Dep. of Plant and Soil Sci.; 2907 15th Street Lubbock TX 79409-2122
13. USDA-ARS; Fisher Delta Research Center; 147 State Hwy T Portageville MO 63873