Adi Perelman, Ben-Gurion University of the Negev, Beer Sheva, Israel, Helena Jorda Guerra, Earth and Environmental Sciences, KU Leuven, Leuven, Belgium, Jan Vanderborght, Forschungszentrum Jülich, Julich, 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, Ben-Gurion Univ of the Negev, Ben-Gurion University of the Negev, Sede Boqer Campus, Israel