1. Department of Water, Atmosphere and Environment; Universitat fur Bodenkultur Wien; 1190 Vienna Austria
2. Integrated Water and Land Management and Ecosystems Program; International Center for Agricultural Research in the Dry Areas (ICARDA); Amman Jordan
3. Agricultural Research; Gondar Agricultural Research Center (GARC); 4835-537 Gondar Ethiopia
4. Food and Agriculture Organization of the United Nations; Land & Water (AGL); 00153 Rome Italy