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Johannes Deelstra Agricultural University, Wageningen, The Netherlands Jordforsk

Johannes Deelstra Agricultural University, Wageningen, The Netherlands Jordforsk. Modelling in monitored catchments. Experiences from case studies in Norway. SOIL/SOILN_NO in the Skuterud catchment SOILNDB in the Mørdre catchment. Location of catchments in the JOVÅ-programme. North pole.

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Johannes Deelstra Agricultural University, Wageningen, The Netherlands Jordforsk

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  1. Johannes Deelstra Agricultural University, Wageningen, The Netherlands Jordforsk

  2. Modelling in monitored catchments Experiences from case studies in Norway SOIL/SOILN_NO in the Skuterud catchment SOILNDB in the Mørdre catchment

  3. Location of catchments in the JOVÅ-programme North pole president Bush Volvo EU, y/n

  4. The Skuterud catchment In operation since 1993 Land use Area ( ha) Agricultural area 272 forest area 129 Bogs 10 roads, farms 13 Housing area 25 Total area 449

  5. The Mørdre catchment In operation since 1991 Land use Area (ha) Agricultural area 444 Forest 192 Bogs 27 Housing area, roads, etc 18 Sum 681

  6. Measurement programme in JOVÅ-catchments Discharge measurement Water sampling and analysis(TDS, Ntot, Ptot) runoff(mm) N,P,SS loss (ha-1)

  7. Measurement programme in JOVÅ-catchments (cont’d) • Collection of information on farming practices • type of crop • fertiliser application • yield • sowing/harvesting dates • type/date of soil tillage • In addition • soil mapping, • profile descriptions • additional determinations of soil physical parameters

  8. Simulation Skuterud The Soil model • water and heat transport in the vertical profile • daily meteorological data and soil physical parameters, initial values • numerous switches to set SOILN_NO, Norwegian version of the Swedish SOILN model - includes major nitrogen and carbon processes - many inputs from SOIL - nitrogen application including the dates of application, type of crops, sowing and harvesting dates, crop yield ploughing dates - MATLAB NITROGEN LEACHING FROM THE ROOT-ZONE TO TILE DRAINAGE/GROUNDWATER.

  9. Skuterud Simulation for each farmer field • Simulations • No measures • With measures • Optimal fertiliser application • Catch crops • Irrigation

  10. Skuterud Nitrogen runoffno measures

  11. Skuterud Comparison of measures Effects(%) Opt. fert. appl.: 4.7 , Catchcrops: 20, Irrigation: 12

  12. Skuterud Nitrogen leaching maps

  13. Mørdre - SOILNDBLarsson et al. (2001), SLU • A ”shell” in Visual Basic, coupling SOIL og SOILN(SLU) • To quantify N-loss from agricultural areas

  14. Input og parameterisering • Input preperation: through Excel into SOILNDB-database • climatological data • soilsdata • farming practices (fert., soil prep., etc) • Parameter setting: • through SOILNDB-database (possibility to change) • through changing program-code

  15. Soils • soil physical parameters (pF, ksat, texture, org. matter) • two alternative sources: • from soil database in SOILNDB (10 USDA jordarter og 7 ”Nordic” soil types. • own data Farming practices crop type, fertiliser, type and quantity soil tillage, type, date

  16. Simulation procedure Mørdre • Simulation • for individual farmer fields (input; farmer information) • for 2 ha units(input SSB)

  17. Results: runoff(mm)

  18. Results: nitrogen losses

  19. Summary • both models; user friendly • SOIL/SOILN_NO/SOILNDB, one dimensional - catchment? • one dimensional model • size of catchment(limits?) • surface runoff? • validation of modelling results • against total catchment runoff; justified? • what about flow processes? • how to deal with variability in catchments • soil physical parameters, • sowing/harvesting, fertiliser application

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