Nicole Wrage-Moennig, Faculty of Agricultural and Environmental Sciences, Grassland and Forage Sciences, University of Rostock, Rostock, GERMANY, Sebastian Fiedler, Faculty of Agricultural and Environmental Sciences, Grassland and Forage Sciences, University of Rostock, Rostock, ., GERMANY, Teresa Fuertes-Mendizábal, University of the Basque Country, Bilbao, Spain, José Mª Estavillo, University of the Basque Country UPV/EHU, Bilbao, Spain, James A. Ippolito, PhD , C127 Plant Sciences Building, Ohio State University, Powell, OH, US, Nils Borchard, Geography, Ruhr-University Bochum, Bochum, Germany, Maria Luz Cayuela, Department of Soil and Water Conservation and Waste Management, Campus Universitario de Espinardo, Murcia, Spain, Kurt A. Spokas, 439 - Borlaug Hall, USDA-ARS, St. Paul, MN, Jeffrey M. Novak, USDA-ARS, Florence, SC and Claudia Kammann, Department for Soil Science and Plant Nutrition / WG Climate Change Research for Special Crops, Hochschule Geisenheim University, Geisenheim, Germany