Yael Laor, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Ramat Yishay, Israel, Uzi Ravid, Institute of Plant Sciences, Agricultural Research Organization, Ramat Yishay, Israel, Robert Armon, Faculty of Civil & Environmental Engineering, Technion-Israel Institute of Technology, Haifa, Israel, Ibrahim Saadi, Institute of Soil, Water and Environmental Sci., Agricultural Research Organization, Ramat Yishay, Israel and Jacek A. Koziel, Dept. of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA