The annual emission inventory for the sector “Agriculture” is preparated with the inventory model Py-GAS-EM. Chapter [1.2](/1%20General%20aspects/1.2%20Inventory%20model%20py-gas-em) describes the model and the underlying methodologies. The symbols, units and definitions used for the inventory preparation are presented in Chapter [1.1](/1%20General%20aspects/1.1%20symbols,%20units,%20definitions). The emission calculations are performed separately for each source category using the respective input data. For the input data see Chapter [2](/2%20Input%20data). More details and special features of the source categories are described in Chapters [3](/3%20Enteric%20fermentation) to [5](/5%20Crop%20production%20and%20agricultural%20soils). Chapter [6](/6%20Emission%20inventory%20uncertainty) deals with the uncertainties of the emission results. The preparation of the emission inventory includes quality control and assurance, see Chapter [1.3 ](/1%20General%20aspects/1.3%20Quality%20management).
The subsequent sub-chapters provide an overview of the basic methodologies for the preparation of the German agricultural inventory. For the calculation of the emissions orginating from animal husbandry animal sub-categories are defined that are homogeneous with respect to animal performance (weights, growth, Milk yield, etc.), age and utilisation (fattening or breeding), see Chapter [2.2](/2-Input-data/2.2-Formation-of-animal-subcategories). The figure below shows the concept for calculating greenhouse gas emissions from German livestock farming.
The subsequent sub-chapters provide an overview of the basic methodologies for the preparation of the German agricultural inventory. For the calculation of the emissions originating from animal husbandry animal sub-categories are defined that are homogeneous with respect to animal performance (weights, growth, Milk yield, etc.), age and utilisation (fattening or breeding), see Chapter [2.2](/2-Input-data/2.2-Formation-of-animal-subcategories). The figure below shows the concept for calculating greenhouse gas emissions from German livestock farming.
**Figure 1: GHG emissions from livestock husbandry (Py-GAS-EM model)** 
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Chapters [4.3](/4%20Manure%20management/4.3%20Air%20pollutants%20and%20dust) and [4.4](/4%20Manure%20management/4.4%20Greenhouse-gases) deal with the calculation of greenhouse gas and other emissions related to the anaerobic digestion of manure in biogas plants.
The anaerobic digestion of energy crops is based in principle on the same concept as the digestion of animal manures, but is dealt with separately in Chapter [5.1](/5%20Crop%20production%20and%20agricultural%20soils/5.1%20digestion%20of%20energy%20crops%20and%20management%20of%20the%20digestate). The detailed description of the methods for calculating emissions in connection with agricultural soils can be found in Chapter [5](/5%20Crop%20production%20and%20agricultural%20soils). Modifications of methods with respect to previous year’s submission are shortly discussed in Chapter [1.3](/1%20General%20aspects/1.3%20Quality%20management#changes-with-respect-to-the-previous-submission).
The anaerobic digestion of energy crops is based in principle on the same concept as the digestion of animal manures, but is dealt with separately in Chapter [5.1](/5%20Crop%20production%20and%20agricultural%20soils/5.1%20digestion%20of%20energy%20crops%20and%20management%20of%20the%20digestate). The detailed description of the methods for calculating emissions in connection with agricultural soils can be found in Chapter [5](/5%20Crop%20production%20and%20agricultural%20soils). Modifications of methods with respect to previous year’s submission are shortly discussed in Chapter [1.3](/1%20General%20aspects/1.3%20Quality%20management#changes-with-respect-to-the-previous-submission).
