Report - DCE - Nationalt Center for Miljø og Energi

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*NQMJFE FNJTTJPO GBDUPS
Table 6.5 shows the implied emission factor for each NFR livestock category
from 1990 to 2010. The implied emission factor expresses the average emission
of NH3 per AAP (annual average production) per year. The implied
emission factor is changing from year to year depending on a combination of
several factors, such as:
• change in number of animal or change in the share of different subcategories,
• change in fodder condition and N-excretion,
• change in housing type,
• change in handling of manure in relation to storage and application.
It should be mentioned that the emission from manure deposited by grazing
animals is included in the emission from agricultural soils (NFR – 4.D2c).
In Annex 2C1, more detailed information about N-excretion and housing
type for some livestock categories, 1985–2010, used in the Danish emission
inventory are given. Furthermore, tables show the Danish standards for
emission factors used to calculate the NH3 emission in housings and in relation
to storage and application of manure.
For most of the animal categories, the implied emission factor has decreased
from 1985 to 2010, which is the result of measures in relation to implementation
of the action plans for the aquatic environment and the Ammonia Action
Plan. Increasingly strict requirements to improve the utilisation of nitrogen
in manure have resulted in reduction of N-excretion, especially for
fattening pigs. Changes in manure management in relation to spreading are
another important factor which has reduced the emission. Measures include
a requirement for a minimum 9-month manure storage capacity, requirement
that manure applied to soil be ploughed down within six hours, a ban
on the spreading of manure in winter and, from 1 August 2003, broad
spreading is no longer allowed. From 2003 slurry tanks have to be covered
with supernatant or safety access cover. From 2006 it is prohibited to treat
straw with NH3 but in 2010 an exemption has been given due to wet
weather.