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Validating CERES-wheat under North-German environmental conditions |
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| Authors: | M. Langensiepen, H. Hanus, P. Schoop,W. Gr sle |
| Affiliation: | aModelling Plant Systems, Institute of Crop Science, Humboldt University of Berlin, Invalidenstrasse 42, D-10115 Berlin, Germany bInstitute of Crop Science, Faculty of Agriculture and Human Nutrition, University of Kiel, Olshausenstrasse 40, D-24118 Kiel, Germany cInstitute of Agro-Environmental Research, Sonnenweg 1, D-21647 Moisburg, Germany dGerman Weather Service (DWD), Kaiserleistr. 35, 63067 Offenbach/Main, Germany |
| Abstract: | The predictive quality of CERES-wheat was tested under contrasting nitrogen management and temperate-maritime climate conditions of North-Germany. Field data from 9 years of observations were used in this study. The magnitudes of the genetic parameters of the local wheat cultivar “Orestis” were strongly influenced by seasonal weather fluctuations. For predicted yield and harvest biomass, the root mean square error was 2.2 t/ha and 3.2 t/ha, respectively. These errors were too large to permit a practical application of the CERES-wheat model for optimizing fertilizer management under the production conditions of North-Germany. The results of this study suggest that the model needs to be considerably improved with respect to the simulation of soil and plant water-relations, as well as the interaction between water and nitrogen uptake which were found to be inconsistent. |
| Keywords: | CERES DSSAT Wheat Crop modelling Simulation Decision support Validation Temperate-maritime climate Nitrogen management North-Germany |
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