Affiliation: | 1.Biogeochemistry of Agroecosystems, Georg-August University, Goettingen, Germany ;2.Institute of Plant Nutrition and Soil Science, Christian-Albrechts University, Rodewald Str. 4, 24118, Kiel, Germany ;3.Department of Environmental Studies, University of California, Santa Cruz, Santa Cruz, CA, USA ;4.Agroecology, University of Bayreuth, Bayreuth, Germany ; |