1. International Center for Tropical Agriculture (CIAT), Tropical Forages Program, Nairobi, Kenya
2. African Plant Nutrition Institute (APNI), Nairobi, Kenya
3. The Nature Conservancy (TNC), Arlington, VA USA
4. Yale School of the Environment, New Haven, CT, USA
5. Mohammed VI Polytechnic University, Benguerir, Morocco
6. Murdoch University, Murdoch, Western Australia