Saskia Keesstra, Wageningen University & Research Centre, Wageningen, NETHERLANDS, Johannes Bouma, soils, Wageningen University & Research Centre, Rhenen, NETHERLANDS, Pablo Tittonell, Natural Resources and Environment Program, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina, Buenos Aires, Argentina, Luca Montanarella, European Commission - DG Joint Research Centre, Ispra, Italy, Jakob Wallinga, Soil Geography and Landscape Group,, Wageningen University, Wageningen, Netherlands, Gerber de Mol, Alterra, Wageningen University and Research Centre, Wageningen, Netherlands, Louise Fresco, Wageningen University and Research Centre, Wageningen University and Research Centre, Wageningen, Netherlands, Richard D. Bardgett, Faculty of Life Sciences, University of Manchester, Manchester, England, Boris Jansen, University of Amsterdam, Amsterdam, Netherlands, Wim van der Putten, Department of Nematology, Wageningen University, Wageningen, Netherlands, Yakov A. Pachepsky, Bldg. 173 BARC-EAST, USDA-ARS, Beltsville, MD, John Quinton, Lancaster Environment Centre, Lancaster University,, , Lancaster, United Kingdom,, United Kingdom, Simon Moolenaar, Department of Science & Education,, Commonland,, Amsterdam, Netherlands, Peter Smith, Institute of Biological and Environmental Sciences,, University of Aberdeen,, Aberdeen, United Kingdom, United Kingdom and Artemi Cerda, Blasco Ibáñez, 28, University of Valencia, València, SPAIN