Simulation of residual effects and nitrate leaching after incorporation of different ley types

The effects of the different treatments on nitrate leaching were simulated quite satisfactorily. However, there was a deviation between the simulated and observed absolute level and timing of nitrate concentrations in suction cups. Scenario analysis showed that this partly could be explained by problems with refractory soil organic matter and gross nitrogen mineralization in soils with high C:N ratios.