1. USDA‐ARS, USDA‐ARS Arid‐Land 21881 North Cardon Lane MaricopaAZ85138
2. Center for Global Change and Earth Observations Michigan State Univ. 202 Manly Miles Building, 1405 S. Harrison Road East LansingMI48824
3. School of Plant Sciences Univ. of Arizona P.O. Box 210036TucsonAZ85721
4. Dep. of Agricultural and Biological Engineering Univ. of Florida GainesvilleFL32611
5. International Fertilizer Development Center Complex F, Wilson Dam Highway Muscle ShoalsAL35661
6. AgWeatherNet Program Washington State Univ. 24106 North Bunn RoadProsserWA99350