1. USDA-ARS; Central Great Plains Res. Stn.; 40335 County Rd., GG Akron CO 80720
2. USDA-ARS; Environmental Management and, Byproduct Utuilization Lab.; Room 117, 10300 Baltimore Ave., Bldg. 308 BARC-EAST Beltsville MD 20705
3. USDA-ARS; Vegetable and Forage Crops, Research Lab.; 24106 North Bunn Rd. Prosser WA 99350
4. Colorado State Univ.; Natural Resource Ecology Lab.; Fort Collins CO 80523