P. Azinwi Tamfuh

Department of Soil Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang, P.O. Box 222, Dschang, Cameroon

D. Tsozué

Department of Earth Sciences, Faculty of Sciences, University of Maroua, P.O. Box 814, Maroua, Cameroon.

M.A. Tita

Department of Biology, Higher Teacher Training College, Bambili, University of Bamenda, P.O. Box 39 Bambili, Cameroon.

A. Boukong

Department of Soil Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang, Dschang, Cameroon

R. Ngnipa Tchinda

Department of Soil Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang, Dschang, Cameroon

H. Ntangmo Tsafack

Department of Animal Biology, Faculty of Sciences, University of Dschang, P.O. Box 67, Dschang, Cameroon

A.D. Mvondo Ze

Department of Soil Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang, Dschang, Cameroon