1. Department of Crop and Soil Sciences, Faculty of Agriculture, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana
2. Soil Fertility and Plant Nutrition Division, CSIR-Soil Research Institute, Kumasi, Ghana
3. Department of Theoretical and Applied Biology, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana
4. Soil Microbiology Section, International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria