Estimation of Nsurplus and losses in Denmark using FarmN

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Estimation of N-surplus and -losses in Denmark
using Farm-N
www.Farm-N.dk

• Dept. for Agroecology, Danish Institute of
  Agricultural Sciences

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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

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

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Farm Field Rotation Cattle Pig Manure Balance
Results Doc
Farm-N
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Field
Rotation 1 Arable rotation with grass/clover
ley Rotation 2 Continuous maize
Farm-N
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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
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Cattle
Breed Categories Numbers Feeding
regime Production level Efficiency Housing type
Farm-N
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Pigs
Categories Numbers Feeding regime Production
level Efficiency Housing type
Farm-N
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Manure

• Optimized manure application
• with respect to
• maximum utilization
• subject to
• - fields allowed to receive manure
• crop-specific utilization rates

Farm-N
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Balance of field livestock interactions
Produced - used - losses bought sold 0
Farm-N
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Results
Farm-N
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Results
Distribution of Farm gate N-surplus 168 kg N/ha
Lost of input 7 4 1 7 2 3 5
Farm-N
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Conclusions

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

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Future developments

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

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www.farm-N.dk/FarmNTool
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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.
pdf 1-7. Kristensen, I. S. 2005a Nitrogen
balance from cash crop farms (2002).
http//www.lcafood.dk/processes/agriculture/N_bala
nce_cash_crop_farms_2002.htm. Kristensen, I. S.
2005b Nitrogen balance from dairy farms (2002).
http//www.lcafood.dk/processes/agriculture/N_bala
nce_dairyfarms_2002.htmtable_1. Kristensen, I.
S. 2005c Nitrogen balance from pig farms
(2002). http//www.lcafood.dk/processes/agricultur
e/N_balance_pigfarms_2002.htm. Kristensen, I.
S. 2005d Uncertanties on Farm Gate N-balances,
see. http//www.agrsci.org/afdelinger/forskningsaf
delinger/jpm/medarbejdere/isk/oversigtsside_med_pu
blikationer. 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/Documentation20of20
the20used20coefficients20in20Farm.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.htm
l. DARCOF.eNews. September 2003.