1. Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links, Ghent, Belgium
2. KERMIT, Department of Data Analysis and Mathematical Modelling, Faculty of Bioscience Engineering, Ghent University, Coupure Links, Ghent, Belgium
3. Department of Organic Production, Inagro, Ieperseweg, Rumbeke Beitem, Belgium
4. Soil Service of Belgium vzw, Willem de Croylaan, Leuven-Heverlee, Belgium