1. Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
2. Department of Soil Science, Earth Science Unit, Felix Houphouet-Boigny University, Abidjan, Côte d’Ivoire
3. Tuber and Root Crops Program, National Agronomic Research Center (CNRA), Abidjan, Côte d’Ivoire
4. Department of Soil Management, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
5. Isotope Bioscience Laboratory–ISOFYS, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium