1. USDA-ARS; George E. Brown, Jr. Salinity Laboratory; 450 West Big Springs Road Riverside CA 92507-4617
2. Department of Land, Air, and Water Resources, 123 Veihmeyer Hal; University of California; Davis CA 95616
3. Department of Environmental Sciences, Soil Physics, Ecohydrology and Groundwater Quality Group; Wageningen University; Nieuwe Kanaal 11 6709 PA Wageningen The Netherlands