1. Wageningen Environmental Research, P.O. Box 47, 6700AA Wageningen, The Netherlands
2. iES Landau, Institute for Environmental Sciences, University of Kaiserslautern-Landau (RPTU), Fortstraße 7, D-76829 Landau, Germany
3. Research & Development, Crop Science, Environmental Modelling, Bayer AG, 40789 Monheim, Germany