Addressing Constraints, Variability and Uncertainty

The limitations of SoilGen are described in terms of maximum simulation period, model discretization and stability issues. The latter are often associated with unrealistic inputs. Approaches to dealing with spatial heterogeneity with a pedon model as well as the assessment of prediction accuracy are discussed. To improve model accuracy, calibration preceded by a sensitivity analysis is useful. Both are discussed in general terms and also a case on parametrizing the clay migration sub-model is elaborated.