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Nitrogen Input Control on Danish farms

Nitrogen Input Control on Danish farms. Senioradviser Leif Knudsen Danish Agricultural Advisory Service. Outline:. Background for regulation of nitrogen input Review of the legislation The current legislation The effect of the legislation on farmers’ practice

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Nitrogen Input Control on Danish farms

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  1. Nitrogen Input Control on Danish farms Senioradviser Leif Knudsen Danish Agricultural Advisory Service

  2. Outline: • Background for regulation of nitrogen input • Review of the legislation • The current legislation • The effect of the legislation on farmers’ practice • The economic consequences for the farmers • The effect on environmental parameters

  3. Two main problems caused by leaching of nitrogen from agriculture: • Increase of nitrate in ground water • /drinking water • Incidences of depletion of nitrogen • in the marine water (inlets, eustaries)

  4. Fertiliser mineral fertilizer,kg/ha Nitrate Fertiliser mg nitrate pr. liter

  5. Eutrofication in inlets Cover on buttom after an incident of lack of oxygen Depletion of oxygen has always occured. Depletion of oxygen is more common with high N and P content. Depletion of oxygen was more common in the 80’ies and 90’ies than before.

  6. Maximum allowed animals per hectare *1 without heifers 1 Animal Unít = 100 kg N ab storage

  7. Storage capacity for animal manure Normal: At least 9 months on pig farms. 7 months on dairy farms with animals gra- zing in summer New stables: farmers normally invest for 12 months storage capacity

  8. Animal manure continued

  9. Animal manure continued: Spreading technique: Use of broadcasting is banned. All liquid manure must be spread with trailing hoses or direct injection Manure spread on bare soil must be incorporated within 6 hours

  10. Covercrops: 65 percent of the area must be ”Autumn Green fields: Wintercereal, winteroilseed rape, beets, potatoes(late), corn… 6 percent of the area must be ”supergreen Fields: catchcrops of undersown grass or crusifer crops.

  11. Nitrogen quotas per farm:

  12. Examples of Danish N-quotas for different crops

  13. Table 6. Example of a calculation of an N-quota for a pig farmer.

  14. 450 Mineral N 400 350 300 Thous. ton Nitrogen 250 N in animal manure 200 150 100 50 0 1980 1985 1990 1995 2000 2005

  15. Nitrogen surplus in Danish agriculture 1900 1925 1950 1975 2000 600 500 400 1000 tons N 300 200 100 0

  16. Time for application of organic manure Slurry

  17. Winter crop coverage

  18. N surplus in fields in DK 500 450 400 350 Misc. 300 Change in soil content 1000 ton N 250 N-evaporation 200 Denitrificatron 150 Leaching 100 50 0 1985 1990 1996 1997 1998 1999

  19. Development in N-concentration1990/91 – 1998/99

  20. Modelling of N-leachingin 7 catchments N-leaching at standard precipixation

  21. Review of the legislation

  22. 120 100 80 60 40 20 0 EU Belgium-Lux. Ireland Great Britain Sweden Germany Holland Portugal Denmark Finland Austria France Italy Spain Greece Nitrogen and phosphorus in artificial fertiliser 1990-2002 Nitrogen Phosphorus Rel. development 1989 to 2002

  23. 2000 1900 1925 1950 1975 Phosphorus surplus 90 80 70 60 50 1000 tons P 40 30 20 10 0 -10

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