1. Centre of Regional Agricultural Research, Institute of Rural Economy, Bamako, Mali
2. Department of Production Systems and Natural Resources Management, Institute of Rural Economy, Sikasso, Mali
3. Centre of Regional Agricultural Research, Institute of Rural Economy, Sikasso, Mali
4. School of Tropical Forestry, National University of Agriculture, Benin
5. Department of Bioscience, Aarhus University, Aarhus, Denmark
6. Department of Plant Production, Ghent University, Ghent, Belgium