CALIBRATION OF THE SIMULATION-MODEL CERES WHEAT UNDER CONDITIONS OF SOILS WITH SHALLOW WATER-TABLE AND TEMPERATE CLIMATE .2. VERIFICATION OF THE MODIFIED-MODEL CERES WHEAT

The Ceres Wheat yield model has been adopted to soils under wet conditions and to humide climate. The basic assumptions of the modified model have been checked. The simulated results of the soil water balance, the plant development and the nitrate losses by drain discharge give fairly well agreements to field data from a Calcaric Fluvisol (Speicherkoog, Schleswig-Holstein). The modification improves the model and leads to the opportunity to simulate special aspects in agronomical and ecological advices.