1. USDA-ARS, Food Animal Environmental Systems Research Unit; 2413 Nashville Rd.- B5 Bowling Green KY 42101
2. Crop and Soil Sciences Dep.; Univ. of Georgia; Athens GA 30602
3. Biosystems and Agricultural Engineering Dep.; Oklahoma State Univ.; Stillwater OK 74078-6016
4. Civil and Environmental Engineering Dep.; Mississippi State Univ.; Mississippi State MS 39762
5. Crop, Soil, and Environmental Science; Univ. of Arkansas; Fayetteville AR 72701
6. Soil Science Dep.; North Carolina State Univ.; Raleigh NC 27695-7619