1. USDA-ARS, Northwest Irrigation and Soils Research Lab.; 3793 N. 3600E Kimberly ID 83341
2. Dep. of Plant, Soil, and Entomological Sciences; Univ. of Idaho, College of Agricultural and Life Sciences; P.O. Box 442339 Moscow ID 83844-2339
3. National Risk Management Research Lab., U.S. Environmental Protection Agency; 5995 Center Hill Ave. Cincinnati OH 45224
4. USDA-ARS, Coastal Plains Research Center; Florence SC 29501
5. Dep. of Human Environment and Family Sciences; North Carolina A&T Univ.; Greensboro NC 27411