1. ALTERRA Organic matter / nitrogen simulations with SWAP/ANIMO Joop Kroes & Piet Groenendijk

2. ALTERRA Purpose of modelling efforts Prediction of environmental impacts of: Fertilization legislation Water management Land use Special combating measures With respect to: Nitrate concentrations in groundwater N & P transport to surface waters Soil P saturation degree Trace gas emissions (just started)

3. ALTERRA  Key EC Directives  Nitrates 91/676  Water Framework 2000/60/EC  Marine Conventions (e.g. OSPAR, HELCOM, Barcelona); Introductio n

4. ALTERRA Time scales considered Water Framework Directive / Nitrate Directive related Duration: 10 – 50 year Frequency: annual estimates Generates input to surface quality models: Duration: 1 – 10 years Frequency: daily or weekly

5. ALTERRA Dutch assessment approach for N/P leaching to gw/sw Characterized by shallow groundwater tables (deltas; wetlands) Intensive land use (agriculture, urbanisation) Process oriented modelling approach National and regional assessments with the same approach Consensus between research organisations

6. ALTERRA National assessment STONE model chain

7. ALTERRA Plots : calculation units  soil  hydrology  crops  historical P-accumulation  management  fertilization  relation with deep groundwater Regional appraoch

8. ALTERRA transpiration Saturated zone Plant precipitation soil-evaporation Surface waters Deep Groundwater surface runoff - Transport of soilwater - Macro pores interception Atmosphere drainage/ subsurface infiltration drainage/ subsurface infiltration deep percolation/ seepage Unsaturated zone snow melt Hydrological pathways

9. ALTERRA

12. Animo model

13. ALTERRA

15. Parameterizarion of organic matter pool ANIMO: Empirical relation: Animo parameters related to empirical relation:

16. ALTERRA cattle slurry empirical rel. * * * * * * ANIMO