1. USDA-ARS; Grassland, Soil and Water Research Lab.; 808 E. Blackland Road Temple TX 76502
2. Texas AgriLife Extension Service; Dep. of Soil and Crop Sciences; Vernon TX 76384
3. Washington State Univ.; Irrigated Agricultural Research and Extension Center; 24106 N. Bunn Rd Prosser WA 99350
4. Greenwood Resources Inc.; Portland OR 97201