Denmark's National Inventory Report 2005 - Submitted under the ...

Table 6.20 Emissions from crop residue 1990 – 2003.
Crop residue
1990 1991 1992 1993 1994 1995 1996
M kg N
1997 1998 1999 2000 2001 2002 2003
Stubble 18.9 18.5 19.0 19.1 18.3 18.2 18.7 18.8 18.9 18.7 18.6 18.6 18.3 17.6
Husks 11.4 11.1 11.8 11.4 11.5 11.6 12.3 12.5 12.6 11.8 12.0 12.3 11.5 12.0
Top of beets and potatoes 7.1 7.1 6.7 7.2 6.1 5.8 5.9 5.5 5.7 5.4 5.3 5.2 5.5 4.9
Leafs 6.8 6.7 6.7 10.1 10.4 10.3 9.7 8.1 7.9 8.7 9.0 9.2 9.1 9.1
Straw 15.1 14.3 6.1 3.9 5.4 10.4 10.7 11.6 11.4 10.1 10.8 11.6 9.0 9.0
Crop residue, total (M kg N) 59.3 57.7 50.3 51.7 51.7 56.2 57.2 56.5 56.5 54.7 55.7 57.0 53.4 52.5
N2O emission (Gg) 1.17 1.13 0.99 1.01 1.02 1.10 1.12 1.11 1.11 1.07 1.09 1.12 1.05 1.03
FracR 0.31 0.30 0.32 0.37 0.34 0.29 0.27 0.28 0.28 0.27 0.27 0.24 0.27 0.26
Cultivation of histosols
In the previous emission inventory 10% of the organic soils was assumed to be in rotation. Due to
lack of data this area is considered as unaltered from 1990 to 2003, which also means no changes in
the emission from this source. Results from new investigations in relation to estimation of emission
from the LULUCF sector are now available and will be used to re-estimate the N O emission from
2
cultivated organic soils. In the next reporting the emission of N O from organic soils will be in-
2
cluded in the LULUCF sector.
6.4.2.2 Animal Production
The amount of nitrogen deposit on grass is based on estimations from the ammonia inventory. It is
assumed that 15% of the nitrogen from dairy cattle in average is excreted on grass (expert judgement
from the Danish Institute of Agricultural Science – Poulsen et al 2001). The N-excretion on
grass has decreased due to a reduction in the number of dairy cattle. An ammonia emission factor
of 7% is used for all animal categories based on investigations from the Netherlands and the
United Kingdom (Jarvis et al. 1989a, Jarvis et al., 1989b and Bussink 1994).
Table 6.21 Nitrogen excreted on grass 1990 - 2003
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
N-excretion, grass (kt N) 34 35 35 36 35 36 36 35 35 34 34 34 33 32
NH3-N emission (kt NH3-N) 2 2 2 3 2 2 3 2 2 2 2 2 2 2
N deposited on grass (kt N) 32 33 33 33 33 33 33 32 32 31 31 32 31 30
N2O emission (Gg) 1.01 1.03 1.03 1.05 1.03 1.04 1.05 1.02 1.01 0.99 0.99 1.01 0.97 0.94
FracGRAZ is estimated as the volatile fraction by grassing animal compared to the total excreted
nitrogen (N ab animal) (Table 6.22)
Table 6.22 FracGRAZ 1990 - 2003
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Total N-excretion (kt N) 293 291 293 293 283 274 275 274 279 270 270 275 277 273
N-excretion, grass (kt N) 34 35 35 36 35 36 36 35 35 34 34 34 33 32
FracGRAZ 0.12 0.12 0.12 0.12 0.12 0.13 0.13 0.13 0.12 0.13 0.13 0.13 0.12 0.12
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