Report - DCE - Nationalt Center for Miljø og Energi

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In the Danish emission inventory it is chosen to include NH3 emission from
crops, despite the uncertainties related to this emission source. Literature research
shows that the volatilisation from crop types differs considerably.
The emission factors for crops are estimated to 2 % for crops and 0.5 % for
grass based on a literary survey (Gyldenkærne and Albrektsen, 2009). However,
as for the emission ceiling given in the Gothenburg-Protocol and the
EU NEC Directive the emission from crops is not taken into account.
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NH3 is used for conservation of straw for feeding. Investigations show that
80-90% of the supplied NH3 (given in NH3-N) will emit (Andersen HW DO.
1999). However, the emissions can be reduced particularly if the right dose is
used. Therefore it is estimated that the emission factor is 65 % of the applied
NH3-N. Information on NH3 used for treatment of straw is collected from
the suppliers. NH3 treated straw has been prohibited from 2006, but in 2010
an exemption were given due to wet weather.
As for the emission ceiling given in the Gothenburg-Protocol and the EU
NEC Directive the emission from NH3 treated straw is not taken into account.