Mohammad R Gohardoust, Department of Soil, Water and Environmental Science, University of Arizona Soil Water & Environmental Science, Tucson, AZ, Horst Hardelauf, IBG-3, Forschungszentrum Jülich, Jülich, Germany, Asher Bar-Tal, Institute of Soil, Water and Environmental Sciences, ARO Volcani Center, Bet Dagan, ISRAEL, Hadar Heller, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel, Michal Amichai, Institute of Plant Nutrition and Physiology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel and Markus Tuller, Department of Environmental Science, The University of Arizona, Tucson, AZ