Organic EprintsBiogaserzeugungspotential aus Gülle und Koppelprodukten in viehhaltenden und viehlosen Betriebssystemen des ökologischen LandbausKurtMöllerauthorWalterStinnerauthorArnoDeukerauthorGünterLeitholdauthorIn two agricultural systems with and without animal husbandry the potential to produce renewable energy by digesting slurry and organic residues to biogas were assessed. In comparison to some other methods of energy production by biomass biogas production has the advantage of keeping the nutrients of the substrates within the agricultural system. They can be used as fertilisers. In the investigated system with milk production (0,8 cows ha-1, 8 crops, among them 4 cereals, peas, potatoes and 2 clover grasses with catch crops after winter cereals and peas (see DEUKER et al. 2005), it is possible not only to ferment slurry, but also catch crops and straw of peas and cereals. The methan production potential by digesting only slurry is the equivalent of around 327 l diesel fuel ha-1. By digesting a well developed catch crop it is possible to harvest the equivalent of around 750 l diesel fuel per ha.-1 sown with such crops. Related to the whole system with 4 catch crops within 8 fields it is possible just by including catch crops in the fermentation process with slurry to duplicate the methan harvest of the digesting plant to around 700 l diesel fuel ha-1 a-1. By utilisation of biomass like the straw of peas and other residues it is possible to generate the equivalent of approx. 450 l diesel fuel ha-1. Total biogas production potential by including all fermentable biomass is the equivalent of approx. 1150 l diesel fuel per each ha and year. Usually one third of this energy is necessary to temperate the digester, one third can be converted to electricity and one third can be used to heat buildings in the neighbourhood of the fermentation plant. In a typical stockless organic agricultural system composed of six crops (clover gras, potatoes, winter wheat, peas, winter wheat and summer wheat with undersown clover grass, with catch crops after winter wheat and peas, see STINNER et al. 2005) biomass of clover grass and catch crops will normally be left on the field and incorporated in the soil. By fermentation of clover grass there is a biogas production potential of around the equivalent of 3300 to 4700 l diesel fuel ha-1 a-1. Digesting catch crops allows a methan yield of ca. 650 to 700 l diesel fuel ha-1, digestion of other residues like straw other 1250 to 1350 l diesel ha-1. The total energy production potential of the whole crop rotation system is the equivalent of around 1700 to 1800 l diesel per ha and year. Removal of crop residues is coupled with removal of substantial quantities of nitrogen, reducing the residual mineralisable nitrogen amounts on fields at the end of the vegetation period and the risk of nitrate leaching. Recycling, balancing and resource management Composting and manuring Air and water emissions2005kassel university press GmbH, KasselConference paper, poster, etc.

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