Table 3: Methodology used for projection of agricultural emissions
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| Source |
Sub-sector |
% of 2003 agricultural emissions |
Activity data projection |
Emissions factor projection |
|---|---|---|---|---|
Enteric methane emissions (CH4) |
Dairy beef, deer and sheep |
63.2% |
Livestock numbers from PSRM model |
Linear extrapolation of historic per head implied emission factors (as calculated for the inventory using a monthly time step model) |
Other species (horses, goats, pigs and poultry) |
0.2% |
Kept constant at 2003 level |
||
Soils (N2O) |
Emissions due to fertiliser application |
7% |
Average of linear trend and industry estimate |
2003 emission factors used |
Emissions due to nitrogen excreted by animals |
27.6% |
Dairy and beef cattle, deer and sheep: livestock numbers from PSRM model |
Linear extrapolation of historic nitrogen output per head implied emission factors (as calculated for the inventory using a monthly time step model) |
|
Other species: livestock numbers kept at 2003 levels |
2003 emission factors used |
|||
Nitrogen fixing crops, crop residues and histosols |
0.3% |
Kept constant at 2003 level |
||
Manure management (N2O and CH4) |
Dairy beef, deer and sheep |
1.6% |
Livestock numbers from PSRM model |
2003 emission factors used |
Other species (horses, goats, pigs and poultry) |
Kept constant at 2003 level |
|||
Stubble and savannah burning (N2O and CH4) |
0.1% |
Kept constant at 2003 level |
||
