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| Berntsen, Jørgen; Olesen, Jørgen; Petersen, Bjørn Molt; Eriksen, Jørgen. |
| Introduction Management of nitrogen in dairy systems is especially difficult due to the use of organic manures and the residual effects of the pasture. During grazing a considerable build-up of soil N is often observed. Ploughing of the grassland is therefore followed by a large mineralization that might exceed the demand of the subsequent crop. This might lead to large amount of nitrate being leached. In addition, rotations dependent on organic manures rather than mineral fertilizers are believed to have a higher risk of nitrate leaching. The study present results from simulations with the FASSET model (Berntsen et al., 2003) of nitrate leaching and crop growth in organic dairy systems with two types of manures at two different stocking levels.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Production systems. |
| Ano: 2003 |
URL: http://orgprints.org/1700/1/12N_workshop%2DI[1].ppt |
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| Halberg, Niels; Hermansen, John E.; Kristensen, Ib Sillebak; Eriksen, Jørgen; Tvedegaard, Niels; Petersen, Bjørn Molt. |
| Organic rules for grazing and access to outdoor area in pig production may be met in different ways, which express compromises between considerations for animal welfare, feed self-reliance and negative environmental impact such as greeehouse gas emissions and nitrate pollution. This article compares environmental impact of the main organic pig systems in Denmark. Normally sows are kept in huts on grassland and finishing pigs are being raised in stables with access to an outdoor run. One alternative practised is rearing also the fattening pigs on grassland all year round. The third method investigated was a one-unit pen system mainly consisting of a deep litter area under a climate tent and with restricted access to a grazing area. Using life cycle... |
| Tipo: Journal paper |
Palavras-chave: Pigs. |
| Ano: 2010 |
URL: http://orgprints.org/16754/1/16754.pdf |
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