Department of Soil Sciences, Forschungsinstitut für biologischen Landbau (FiBL), Research Institute of Organic Agriculture, Institut de recherche del'agriculture biologique, Ackerstrasse 113, Postfach 219, CH-5070 Frick, Switzerland
Dr. Andreas Fliessbach
Department of Soil Sciences, Forschungsinstitut für biologischen Landbau (FiBL), Research Institute of Organic Agriculture, Institut de recherche del'agriculture biologique, Ackerstrasse 113, Postfach 219, CH-5070 Frick, Switzerland