English Abstract Dynamic simulation models are required to predict the
future nitrate pollution of groundwater and surface water by agriculture, to
derive maximum permissable nitrogen loadings and for evaluation of various
nitrogen emission scenarios. A suitable dynamic simulation model should be
applicable to all major combinations of soil type, land use and management
scenarios. For this purpose the dynamic process oriented N-cycling model
SOILN was implemented at the RIVM for evaluation of the nitrogen surplus
problem in the Netherlands on agricultural soils. The model was originally
developed and provided to us by the Department of Soil Science of the
Swedish University of Agricultural Sciences. At the RIVM the model was
adapted for soils under grassland and grazing. This report summarizes model
principles, provides guidelines for model use and gives examples of model
output for a case study on a farm in Laren, Gelderland.
