1. The Univ. of Arizona; Dep. of Soil, Water and Environmental Science; 1177 E. Fourth St., Shantz Building, Room 429 Tucson AZ 85721
2. USDA-ARS; Genetics and Precision Agriculture Research Unit; POB 5367 Starkville Mississippi State, MS 39762
3. The Univ. of Arizona; Environmental Research Lab.; 2601 E. Airport Dr. Tucson AZ 85756