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<span dir="">For the collective categories 'synthetic fertilizer', 'manure spreading, all animals', and 'other organic fertilizers' by analogy to the procedure for the overall uncertainty of the GHG inventory (see Chapter </span>[<span dir="">6.10</span>](/6%20Emission%20inventory%20uncertainty/6.10%20Total%20uncertainty%20of%20GHG%20inventory)<span dir="">), the uncertainties of activity data and emission factors of the respective subcategories are aggregated using error propagation calculation (see Chapter </span>[<span dir="">6.2</span>](/6%20Emission%20inventory%20uncertainty/6.2%20Gaussian%20error%20propagation)<span dir="">). Only the aggregated uncertainties are included in the calculation of the total uncertainty of the ammonia inventory.</span>
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<span dir="">The overall uncertainty is expressed as percentage of the total emissions of the last year of the time series and is listed at the very bottom ot column H. The other values in column H, however, are auxiliary data required for the uncertainty calculations. These values are proportional to the contributions of the various sub-sources to the total variance of the ammonia inventory, cf. footnote in Table 1. The total uncertainty of ammonia emissions from German agriculture is 10.2 % (valid for 2021). The overall uncertainty is largely determined by the uncertainties in the manure management of dairy cows and fattening pigs and, above all, the spreading of animal manures.</span>
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<span dir="">The overall uncertainty is expressed as percentage of the total emissions of the last year of the time series and is listed at the very bottom ot column H. The other values in column H, however, are auxiliary data required for the uncertainty calculations. These values are proportional to the contributions of the various sub-sources to the total variance of the ammonia inventory, cf. footnote in Table 1. The total uncertainty of ammonia emissions from German agriculture is 10.3 % (valid for 2022). The overall uncertainty is largely determined by the uncertainties in the manure management of dairy cows and fattening pigs and, above all, the spreading of animal manures.</span>
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<span dir="">The percentage uncertainties of the trends of the overall emissions of ammonia from German agriculture is given at the bottom of column M. (For the meaning of the values in column M see the footnote Table 14-2.). The uncertainty of the trend 1990 - 2021 is 4.4 %.</span>
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<span dir="">The percentage uncertainties of the trends of the overall emissions of ammonia from German agriculture is given at the bottom of column M. (For the meaning of the values in column M see the footnote Table 14-2.). The uncertainty of the trend 1990 - 2022 is 4.4 %.</span>
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**Table 1: Uncertainty calculation for the German agricultural ammonia inventory**
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