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| Hansen, Martin N.; Sommer, Sven G.; Henriksen, Kaj. |
| Livestock manure contributes significantly to the global emission of methane (CH4). Methane is emitted during storage of both liquid and solid manure. Part of the solid manure is produced in loose housing systems with solid floors where the manure is stored in a deep litter mat, which is a mixture of straw, urine and faeces. As anaerobic conditions are found in the lower part of the deep litter mat, significant amounts of the carbon stored in the deep litter may be emitted as CH4. It has been estimated that a cattle deep litter mat contributed 11 to 18% of the total CH4 (from cattle digestion and litter) emitted. This source of CH4 does not seem to be included in the IPCC default value for solid manure. During outdoor storage of solid manure, CH4 can be... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2002 |
URL: http://orgprints.org/3480/1/3480.pdf |
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| Hansen, Martin N.; Sommer, Sven G.; Madsen, Niels P.. |
| Ammonia (NH3) emission from livestock production causes undesirable environmental effects and a loss of plant available nitrogen. Much atmospheric NH3 is lost from livestock manure applied in the field. The NH3 emission may be reduced by slurry injection, but slurry injection in general, and especially on grassland, increases the energy demand and places heavy demands on the slurry injection techniques used. The reduction in NH3 emission, injection efficiency and energy demand of six different shallow slurry-injection techniques was examined. The NH3 emission from cattle slurry applied to grassland was reduced by all the injectors tested in the study, but there were major differences in the NH3 reduction potential of the different types of injectors.... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions. |
| Ano: 2003 |
URL: http://orgprints.org/3306/1/3306.doc |
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| Hansen, Martin N.; Henriksen, Kaj; Sommer, Sven G.. |
| Separation of slurry produces a solid fraction that is stored in manure heaps before being used as a fertiliser in crop production. Considerable amounts of ammonia (NH3) and greenhouse gases may be emitted during storage, which has deleterious environmental effects. The emission levels can be expected to depend on oxygenation level inside the bulk of the stored manure and therefore on storage conditions. An experiment was thus set up to study gaseous emissions during storage of the solid fraction, and the effects of the oxygenation of manure heaps on emissions of NH3 and various greenhouse gases. Emissions of NH3 and the greenhouse gases methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2) from an uncovered and covered heap of solids separated from... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions. |
| Ano: 2006 |
URL: http://orgprints.org/5615/1/5615_ny.pdf |
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