1. Institut Polytechnique Rural de Formation et de Recherche Appliquée Département des Sciences et Techniques Agricoles, Unité Science du sol
2. Department of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
3. Department of Theoretical and Applied Biology, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
4. CSIR-Soil Research Institute, Kwadaso, Kumasi