1. USDA‐ARSSoutheast Watershed Research Lab.P.O. Box 748TiftonGA31793
2. Dep. of Environmental and Molecular ToxicologyNorth Carolina State Univ.RaleighNC
3. Tropical Research and Education CenterUniv. of FloridaHomesteadFL33031
4. Dep. of Agricultural and Biological EngineeringUniv. of FloridaGainesvilleFL