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| Eriksen, J; Askegaard, M; Kristensen, K. |
| In dairy farming systems the risk of nitrate leaching is increased by mixed rotations (pasture/arable) and the use of organic manure. We investigated the effect of four organic farming systems with different livestock densities and different types of organic manure on crop yields, nitrate leaching and N balance in an organic dairy/crop rotation (barley – grass-clover – grass-clover – barley/pea – winter wheat – fodder beet) from 1994 until 1998. Nitrate concentrations in soil water extracted by ceramic suction cups ranged from below 1 mg NO3-N/l in 1st year grass-clover to 20-50 mg NO3-N/l in the winter following barley/pea and winter wheat. Peaks of high nitrate concentrations were observed in 2nd year grass-clover, probably due to urination by grazing... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 1999 |
URL: http://orgprints.org/142/1/Text.doc |
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| Eriksen, J; Kristensen, K. |
| An increasing number of breeding sows is kept outdoors in Europe. Outdoor pig production has benefits in terms of animal welfare but may have hidden costs through nutrient losses. We investigated the distribution of nutrients in sow paddocks and the consequence for losses and utilisation in the succeeding crop. Significant correlation between soil inorganic N and the distance to feeding sites was observed after the paddocks had been used by lactating sows for 6 months (P<0.01). Near to feeders inorganic N levels became extremely high whereas 30-40 m from feeders some patches had N levels in the topsoil corresponding to the levels in the reference area without sows. In the following spring only a minor part of inorganic N was still present in the top... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2001 |
URL: http://orgprints.org/150/1/paper.doc |
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