Adi Perelman, ICL, Beer Sheva, Israel, Helena Jorda Guerra, Earth and Environmental Sciences, KU Leuven, Leuven, Belgium, Jan Vanderborght, IBG-3, Forschungszentrum Jülich, Jülich, Germany, Andreas Pohlmeier, ICG-4, ICG-4, Julich, Germany, Shimon Rachmilevitch, French Associates Institutes for Agriculture and Biotechnology of Drylands, Ben-Gurion University of the Negev. Jacob Blaustein Institutes for Desert Research, Sede boqer, Israel and Naftali Lazarovitch, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer, ISRAEL