Report - DCE - Nationalt Center for Miljø og Energi

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Since 1985 there has been a significant decrease in use of synthetic fertiliser.
This is due to requirements to utilising of nitrogen in manure as outlined for
example in the Action Plan on the Aquatic Environment. Further, the use of
different fertiliser types has changed. At present, urea constitutes less than
1% of the total nitrogen used as fertiliser (table 2C.6). It is estimated that 1.5
% of the total nitrogen used in synthetic fertiliser is emitted as NH3 in 2010.
It means the implied emission factor for 2010 is 1.5 % compared to 10 % in
the EMEP/EEA guidebook.
Data on the use of synthetic fertiliser is based on the sale estimations collected
by the Danish Plant Directorate (2011). Emission factors are based on
the values given in EMEP/EEA guidebook (EMEP/EEA, 2009).
The use of synthetic fertiliser includes fertiliser used in parks, golf courses
and private gardens. Approximately 1-2 percent of the synthetic fertiliser
can be related to use out side the agriculture area.
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It is assumed that 5% of the manure from dairy cattle is deposited in the
field, which corresponding to 18 days per year. For heifers 36% of the nitrogen
in the manure is estimated deposited during grazing, 61% for suckling
cows, 50% for horses and 73% for sheep and goats.
An emission factor of 7% of the total nitrogen content is assumed to evaporate
as NH3 (Jarvis HW DO. 1998a, Jarvis HW DO. 1989b and Bussink 1994). The
emission factor is used on all animal categories.