Fig. 3. Access to internal parameters in the Hybrid-Maize model software. Parameters are grouped on four pages: Management, Crop growth, Resp & Photosyn (for respiration and photosynthesis), Hybrid-specific parameters for the relationship between relative maturity (CRM) to total growing degree days (GDD), and Soil. All values can be changed by the user or restored to their original default values by clicking on the ‘Retrieve defaults’ button at lower left.