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Estimation of N-surplus and -losses in Denmark using ’Farm-N’

www.Farm-N.dk. Estimation of N-surplus and -losses in Denmark using ’Farm-N’. Dept. for Agroecology, Danish Institute of Agricultural Sciences. Motivation. Legislation on the losses of N to the environment nitrates (EU Nitrates Directive) ammonia (EU National Emissions Ceilings Directive)

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Estimation of N-surplus and -losses in Denmark using ’Farm-N’

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  1. www.Farm-N.dk Estimation of N-surplus and -losses in Denmark using ’Farm-N’ Dept. for Agroecology, Danish Institute of Agricultural Sciences

  2. Motivation • Legislation on the losses of N to the environment • nitrates (EU Nitrates Directive) • ammonia (EU National Emissions Ceilings Directive) • nitrous oxide (Kyoto agreement) • Farm N surplus is good environmental indicator • Farm N surpluses can be calculated fairly accurately and reliably

  3. Nitrogen flow on farm Farm Inputs Outputs Cattle / Pigs Fields Losses

  4. Reliable

  5. The tool • A whole-farm model for N flow • Focus on the interaction between crop and livestock production • Static model, results represent average situation • Deterministic, so the same input produces the same output • Underlying assumption: Nutrient quota used to regulate management. • Desired feature: Best possible management • As simple as possible

  6. Farm Field Rotation Cattle Pig Manure Balance Results Doc Farm-N

  7. Field Rotation 1 Arable rotation with grass/clover ley Rotation 2 Continuous maize Farm-N

  8. Crop rotation • Optimized crop rotation • with respect to • maximum yield • minimum N-surplus • subject to • - repeating crop sequence • same crop acreage each year • ad hoc rules Farm-N

  9. Cattle Breed Categories Numbers Feeding regime Production level Efficiency Housing type Farm-N

  10. Pigs Categories Numbers Feeding regime Production level Efficiency Housing type Farm-N

  11. Manure • Optimized manure application • with respect to • maximum utilization • subject to • - fields allowed to receive manure • crop-specific utilization rates Farm-N

  12. System definitions Technical coefficients Rest Balance of field – livestock interactions Produced - used -losses + bought – sold = 0 Farm-N

  13. Results Farm-N

  14. Results Distribution of Farm gate N-surplus = 168 kg N/ha Lost of input 7% 4% 1% 7% 2% 3% 5% Farm-N

  15. Conclusions • A web-based prototype is available • Uses data available to the farmer • Negotiations with Danish authorities on its use for screening environmental impacts

  16. Future developments • Farm P balance ? • Data import from farm management programs ? • Online collaboration on system definitions (farmer, adviser, regulation authority) ? • Internationalisation ?

  17. www.farm-N.dk/FarmNTool

  18. http://www.Farm-N.DK/ Litteraturliste Berntsen, J. and Petersen, B. M. 2005: C-TOOL, Danish version see http://web.agrsci.dk/jbe/bin/ctool.html. Jørgensen, M. S., Detlefsen, N., and Hutchings, N. J. 2005: FarmN: A Decision Support Tool for Managing Nitrogen Flow at the Farm Level. EFITA (European Federation for Information Technology in Agriculture, Food and the Environment) konferencen, Vila Real, Portugal, 25.-27. juli-2005. http://130.226.173.223/farmn/FarmNTool.pdf1-7. Kristensen, I. S. 2005a: Nitrogen balance from cash crop farms (2002). http://www.lcafood.dk/processes/agriculture/N_balance_cash_crop_farms_2002.htm. Kristensen, I. S. 2005b: Nitrogen balance from dairy farms (2002). http://www.lcafood.dk/processes/agriculture/N_balance_dairyfarms_2002.htm#table_1. Kristensen, I. S. 2005c: Nitrogen balance from pig farms (2002). http://www.lcafood.dk/processes/agriculture/N_balance_pigfarms_2002.htm. Kristensen, I. S. 2005d: Uncertanties on Farm Gate N-balances, see. http://www.agrsci.org/afdelinger/forskningsafdelinger/jpm/medarbejdere/isk/oversigtsside_med_publikationer. Kristensen, I. S., Detlefsen, N., Hutchings, N., and Petersen, B. M. 2005: Documentation of the used coefficients in Farm-N. http://130.226.173.223/farmn/Documentation%20of%20the%20used%20coefficients%20in%20Farm.pdf. Petersen, B. M. and Berntsen, J. 2003: The turnover of soil organic matter on different farm types. http://www.darcof.dk/enews/sep03/orgmat.html. DARCOF.eNews. September 2003.

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