1. Agricultural Extension Department, Faculty of Agriculture, University of Ghana, P.O. Box 68, Legon, Ghana
2. Communication and Innovation Studies Group, Wageningen University, Wageningen, The Netherlands
3. Plant Production Systems Group, Wageningen University, Wageningen, The Netherlands
4. Agriculture, Forestry and Fisheries Sector, Council for Scientific and Industrial Research, Accra, Ghana
5. Soil Quality Group, Wageningen University, Wageningen, The Netherlands
6. Department of Soil Science, Faculty of Agriculture, University of Ghana, Legon
7. Crop and Weed Ecology Group, Wageningen University, Wageningen, The Netherlands