1. Department of Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BAYCEER), University of Bayreuth, 95440 Bayreuth, Germany
2. Leibniz Center for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany
3. Department of Agriculture, Forest and Food Sciences, University of Turin, 10124 Turin, Italy
4. Rice Research Centre, Ente Nazionale Risi, 27030 Castello d’Agogna, Pavia Italy