Annual Danish informative inventory report to UNECE. Emission ...

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Another important cause of the significant decrease in the NH3 emission
since 1985 is changes in practice of manure application to the fields
where considerable changes have taken place. From the beginning of
the 1990s slurry has increasingly been spread using trailing hoses. From
the late 1990s the practice of slurry injection or mechanical incorporation
into the soil has increased. This development is a consequence of a
ban on broad spreading but it is also a consequence of the general requirement
to improve the utilisation of nitrogen in the manure - e.g. requirements
to a larger part of the nitrogen in manure has to be included
in the farmers nitrogen accounting. This has forced farmers to consider
the manure as a resource instead of a waste product.
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In NFR, the emission of particulate matter (PM) is registered for the
years 2000 to 2009. The emission from the agricultural sector includes
the emission of dust from animal housing systems, which include emission
from cattle, pigs, poultry, horses, sheep and goats. Furthermore,
the emission from field burning of agricultural wastes is calculated.
Present, the Danish inventory do not include emission from plant production,
which means activities related to field operations as harvesting
and cultivation of the soil.
TSP emission from the agricultural sector contributes 28 % to the national
TSP emission in 2009 and the emission shares for PM10 and PM2.5
are only 17 % and 4 % respectively. Most of this comes from animal
production. The emission from the field burning of agricultural residues,
contributes less than 1 % to the agricultural emission.
The same emission factor is used for all years. So changes in the total
PM emissions for each livestock category is mainly reflecting the
changes in number of animal, but also effected by the distribution of the
subcategories and changes in the housing type.
The PM emission from agricultural activities, given in TSP, has decreased
from by 10 % which is mainly due to a fall in the emission from
swine (Figure 6.2). A decrease in emission from swine is a result of
changes in housing system towards slurry based systems, which has a
lover emission factor than solid based system. Another reason is
changes in the fraction of subcategories. An increase in production of
weaners has taken place from 2000-2009 and upper site situation for fattening
pigs, where the emission factor is higher.