1. Professor, Dept. of Soil, Water and Environmental Sciences, Univ. of Arizona, Tucson, AZ 85721 (corresponding author).
2. Researcher, The Wyler Dep. of Dryland Agriculture, Jacob Blaustein Institutes for Desert Research, Ben-Gurion Univ. of the Negev, Sede Boqer Campus, 84990, Israel.
3. Civil and Environmental Engineering, Technion IIT, Haifa 32000, Israel; formerly, Research Scientist, Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel.
4. Assistant Research Scientist, Dept. of Soil, Water, and Environmental Sciences, 429 Shantz Bldg. 38, Univ. of Arizona, 1200 E. Campus Dr., Tucson, AZ 85721.