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| Johansen, A.; Pommeresche, R.; Riley, H.; Løes, A.-K.. |
| Anaerobic digestion of animal slurries and plant residues is a valuable technology to produce bioenergy and fertilizers in organic farming systems, while at the same time reducing propagules of weeds and parasites in the input material. However, the digestion changes the quality of the slurry by reducing its content of organic matter and increasing mineral nitrogen (N) levels. This may have profound impact on soil fauna and microorganisms as well as the biogeochemical processes they drive. Organic farmers fear that application of digested materials may have negative implications for soil fertility by reducing the input of organic matter to the soil, compared to fertilizing with traditional animal slurries or green manures. Hence, it is important to gain... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Composting and manuring; Nutrient turnover. |
| Ano: 2013 |
URL: http://orgprints.org/24569/1/24569.pdf |
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| Løes, Anne-Kristin; Johansen, A.; Pommeresche, R.; Riley, H.. |
| Organic farming systems are today dependent upon fossil energy. Another challenge are soil nutrient concentrations, which may be depleted with time even in animal husbandry systems (Løes & Øgaard 2001). Anaerobic digestion (AD) of animal manure may produce biogas to replace fossil fuels, and reduce methane (CH4) emissions during manure storage. Co-digestion of substrates rich in energy increases the economic viability of the biogas plant, and off-farm substrates such as fish silage or household waste may add nutrients to the farming system. AD may also ease manure handling, while reducing the amount of weed seeds and animal pathogens. A reduced proportion of easily degraded C in the AD-manure may however impact the soil fauna/microflora and humus... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Composting and manuring; Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/24552/1/24552.pdf |
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