Report - DCE - Nationalt Center for Miljø og Energi

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The implied emission factors relating to use of synthetic fertiliser depend on
consumption and type of fertiliser and remain almost the same for all years.
The implied emission factors for grazing animals remain unaltered.
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From 1985 to 2010 the NH3 emission from agricultural soils decreased from
9.59 Gg NH3 to 5.32 Gg NH3, which corresponds to a 45 % reduction (Table
6.9). A considerable decrease in the use of fertiliser has, in particular, been
important for this development.
As mentioned, there has been an active effort in recent decades to reduce nitrogen
leaching by means of action plans. This focus on environmental impact
in agricultural production has led to an improvement in the utilisation
of nitrogen in manure. A consequence of this development is that the use of
fertiliser and, in turn, the NH3 emission has been reduced.
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Emissions reported in NFR table 4G include three emissions sources; emission
from growing crops, sewage sludge used as fertilizer and NH3 treated straw.
NH3 emission from these sources contributes in 2010 with 8 % of the total emission
from the agricultural sector and the most important ones are emission from
growing crops.
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More detailed description covering activity data and emission factors used for
crops and NH3 treated straw is given in Annex 2C3.
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Information on farmed area and cultivation of different crop types is collected by
Statistics Denmark. Information on amount of sewage sludge, N-content and
NH3 emission factor is obtained from reports prepared by the Danish Protection
Agency. The activity data is given in Table 6.10. The amount of sewage sludge
has increased from 1985 until 1995. In the following years to 2010 the trend is a
fall in amount of sludge used as fertiliser as a result of increasing request from
the industrial sector. The sludge is used in industrial process, e.g. in the cement
production and production of sandblasting material.