1. Geology Department Cheikh Anta Diop University of Dakar Dakar Senegal
2. University of Natural Resources and Life Sciences, Vienna, Department of Water Atmosphere and Environment, Institute of Soil Physics and Rural Water Management Vienna Austria
3. LMI IESOL, IRD, ISRA, Bel Air Dakar Senegal
4. CIRAD, UMR Eco&Sols, BP1386, CP18524 Dakar Senegal
5. Eco&Sols, Univ Montpellier, CIRAD, INRAE, IRD, Institut Agro Montpellier France
6. IRD, UMR Eco & Sols, U. Montpellier, IRD, CIRAD, INRAE Montpellier France