[1] Department AGE, Université Lyon, ISARA-Lyon, 23 Rue Jean Baldassini, Lyon Cedex 07
[2] Research Institute of Organic Agriculture (FiBL), Ackerstrasse, Frick
[3] Agroecosystems Research Group, University of Barcelona, Avda. Diagonal 643, Barcelona
[4] Centro di Ricerche Agro-ambientali “Enrico Avanzi”, Università di Pisa, Via Vecchia di Marina 6, Pisa, 56122, San Piero a Grado
[5] Institute of Life Sciences, Scuola Superiore Sant’Anna, Piazza Martiri della Libertà 33, Pisa
[6] Department of organic crop production, INAGRO, Ieperseweg 87, Roeselare
[7] UNEW, Nafferton Ecological Farming Group (NEFG), Newcastle University, Nafferton Farm, Stocksfield
[8] Department of Organic Farming and Cropping, University of Kassel, Nordbahnhofstr. 1a, Witzenhausen
[9] Research Institute of Organic Agriculture (FiBL) Austria, Doblhoffgasse 7/10, Wien
[10] Estonian University of Life Sciences, Kreutzwaldi 1, Tartu
[11] Plant Sciences Unit, Crop Husbandry and Environment, Institute for Agricultural and Fisheries Research (ILVO), Burg. Van Gansberghelaan 109, Merelbeke