1. Soil Sci. Unit, Faculty of Pharmacy, Univ. of Barcelona, Joan XXIII, s/n 08028 Barcelona, Spain
2. Env. Wat. Resources, Ben-Gurion Univ. of the Negev, The Inst. for Desert Res., Kiryat Sde-Boker 84990, Israel, and the Dept. of Industrial Eng. and Management, Beer-Sheva 84105, Israel
3. The Grand Wat. Res. Inst., Technion, Haifa 32000, Israel
4. Sheba Medical Center, Tel-HaShomer 52521, Israel