1. Division of Soil and Water Management, Department of Earth and Environmental Sciences; KU Leuven; Kasteelpark Arenberg 20 bus 2459, 3001 Leuven Belgium
2. Institute for Agricultural and Fisheries Research; Plant Sciences Unit - Crop Husbandry and Environment, Burgemeester Van Gansberghelaan 109, 9820 Merelbeke Belgium
3. Soil Service of Belgium; Willem De Croylaan 48, 3001 Heverlee Belgium
4. Division of Crop Biotechnics, Department of Biosystems; KU Leuven; Willem de Croylaan 42, 3001 Heverlee Belgium
5. Rothamsted Research; Department of Sustainable and Grassland Systems; West Common, Harpenden AL5 2JQ UK
6. Walloon Center of Agricultural Research; Rue du Bordia 4, 5030 Gembloux Belgium
7. Université de Toulouse, INPT, INP-PURPAN, INRA, 24 chemin de Borde rouge; 31320 Castanet Tolosan France
8. ISPA, Bordeaux Sciences Agro, INRA; 71 avenue Edouard Bourlaux, CS 20032 33882 Villenave d'Ornon CEDEX France
9. Faculty of Agricultural and Environmental Sciences; University of Rostock; Justus-von-Liebig-Weg 6, 18051 Rostock Germany
10. Department of Soil and Environment; Swedish University of Agricultural Sciences; Lennart Hjelms väg 9, Uppsala Sweden
11. Division of Mechatronica Biostatistic and Sensor, Department of Biosystems; KU Leuven; Kasteelpark Arenberg 30, bus 2456, 3001 Leuven Belgium
12. Faculty of Applied Economics, Department of Engineering Management; University of Antwerp; Prinsstraat 13, B-2000 Antwerpen Belgium