1. Research Institute of Organic Agriculture (FiBL), Frankfurt am Main, Germany
2. Institute for Plant Production and Plant Breeding II – Organic Farming with Focus on Sustainable Soil Use, Justus Liebig University Giessen, Giessen, Germany
3. Department of Geography, Hong Kong Baptist University, Kowloon, Hong Kong
4. Agroisolab GmbH, Jülich, Germany
5. Institute for Landscape Ecology and Resources Management (ILR), Research Centre for BioSystems, Land Use and Nutrition (IFZ), Justus-Liebig-University Giessen, Giessen, Germany
6. Albert-Ludwigs-University of Freiburg, Freiburg, Germany