1. Centre for Agricultural Landscape Research (ZALF), Institute for Soil Landscape Research, Eberswalder Straße 84, D‐15374 Müncheberg, Germany
2. Department of Entomology, Soils and Plant Sciences, Division of Crop and Soil Environmental Sciences, Clemson University, Clemson, SC 29634‐0359, USA
3. Department of Plant and Soil Science, University of Kentucky, Lexington, KY 40546‐0312, USA