1. Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology Univ. of Bonn Nussallee 13 Bonn 53115 Germany
2. State Climate Office of North Carolina North Carolina State Univ. 1005 Capability Drive Raleigh NC 27695 USA
3. Dep. of Biological and Agricultural Engineering North Carolina State Univ. 3100 Faucette Drive Raleigh NC 27695 USA
4. Institute of Agricultural Sciences ETH Zürich Lindau 8315 Switzerland
5. Dep. of Geography McGill Univ. 805 Sherbrooke St. W. Montreal QC H3A 0B9 Canada