| ... | ... | @@ -2,12 +2,12 @@ |
|
|
|
|
|
|
|
# EF application of calcium fertilizers
|
|
|
|
|
|
|
|
The uncertainties of emissions from application of calcium fertilizers are based on tolerance limits in the composition of fertilizers specified in the Fertilizers Act ([Düngemittelverordnung, 2012](9%20Literature#d%C3%BCngemittelverordnung-2012), pg. 32 ff). The Fertilizers Act tolerates variations of only 2 to 4 %, depending on the type of calcium fertilizer. The total uncertainty (95 % confidence interval) for liming in agriculture varies for the different years since 1990, but has always been lower than 3 %. This value is considerably lower for liming in the forest sector. However, as emissions from agriculture and forest are reported as a total, the calculation of the the total uncertainty of the German GHG inventory is conservatively based on an uncertainty of the emission factor of ±3 %, interpreted as 95 % confidence interval (normal distribution).
|
|
|
|
The uncertainties of emissions from application of calcium fertilizers are based on tolerance limits in the composition of fertilizers specified in the Fertilizers Act ([Düngemittelverordnung, 2012](https://git-dmz.thuenen.de/vos/EmissionsAgriculture2023/-/wikis/9%20Literature#d%C3%BCngemittelverordnung-2012), pg. 32 ff). The Fertilizers Act tolerates variations of only 2 to 4 %, depending on the type of calcium fertilizer. The total uncertainty (95 % confidence interval) for liming in agriculture varies for the different years since 1990, but has always been lower than 3 %. This value is considerably lower for liming in the forest sector. However, as emissions from agriculture and forest are reported as a total, the calculation of the the total uncertainty of the German GHG inventory is conservatively based on an uncertainty of the emission factor of ±3 %, interpreted as 95 % confidence interval (normal distribution).
|
|
|
|
|
|
|
|
<span dir="">In general, some of of the C contained in calcium fertilizers is not converted into CO<sub>2</sub>, causing additional uncertainties of the emissions. However, this cannot be taken into account due to lack of statistical data on the degree of conversion of C into CO<sub>2</sub>. Hence, apart from composition tolerance limits, the calculated CO<sub>2</sub> emissions represent maximum possible emissions.</span>
|
|
|
|
|
|
|
|
# EF application of urea
|
|
|
|
|
|
|
|
<span dir="">Using the N tolerance for urea in the Fertilizers Act (</span>[<span dir="">Düngemittelverordnung, 2012</span>](9%20Literature#d%C3%BCngemittelverordnung-2012)<span dir="">), it is possible to derive an uncertainty of about 1 % of the total urea emission factor. The uncertainty range of ± 1 % is interpreted as 95 % confidence interval (normal distribution).</span>
|
|
|
|
<span dir="">Using the N tolerance for urea in the Fertilizers Act (</span>[<span dir="">Düngemittelverordnung, 2012</span>](https://git-dmz.thuenen.de/vos/EmissionsAgriculture2023/-/wikis/9%20Literature#d%C3%BCngemittelverordnung-2012)<span dir="">), it is possible to derive an uncertainty of about 1 % of the total urea emission factor. The uncertainty range of ± 1 % is interpreted as 95 % confidence interval (normal distribution).</span>
|
|
|
|
|
|
|
|
<span dir="">In general, some of of the C contained in calcium fertilizers is not converted into CO<sub>2</sub>, causing additional uncertainties of the emissions. However, this cannot be taken into account due to lack of statistical data on the degree of conversion of C into CO<sub>2</sub>. Hence, apart from composition tolerance limits, the calculated CO<sub>2</sub> emissions represent maximum possible emissions.</span> |
|
|
\ No newline at end of file |
