1. Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany
2. Soil and Irrigation Research Centre, School of Agriculture, University of Ghana, Accra P.O. Box LG 68, Ghana
3. CSIR-Savanna Agricultural Research Institute, Tamale P.O. Box TL 52, Ghana
4. Royal Netherlands Meteorological Institute, 3731 GA De Bilt, The Netherlands
5. ICRISAT-Senegal, Dakar P.O. Box 24365, Senegal
6. Manobi Africa PLC, Dakar P.O. Box 25026, Senegal
7. Department of Soil Science, University of Ghana, Accra P.O. Box LG 245, Ghana