1. Department of Crop Sciences: Agronomy in the Tropics Georg‐August University of Goettingen Goettingen Germany
2. World Agroforestry Centre (ICRAF) Nairobi Kenya
3. Institute for Crop and Soil Science JKI – Federal Research Centre for Cultivated Plants Braunschweig Germany
4. International Potato Center (CIP) Apartado Lima Peru
5. International Center for Tropical Agriculture (CIAT) Nairobi Kenya