Baptiste D. Ettien, Jean, Department of Soil Science, Research and Training Unit, Earth Sciences and Mining Resources (ESMR or STRM), University Felix Houphouët Boigny of Cocody,Abidjan, Côte d’Ivoire Centre Suisse de Recherches Scientifiques en Côte d’Ivoire, Department of Food Security and Nutrition, Côte d'Ivoire