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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; Askegaard, M. |
| Sulphate leaching losses may reduce the long-term possibility of maintaining the S supply of crops in low input farming systems. Sulphate leaching and S balances were investigated in an organic dairy/crop rotation (barley [Hordeum vulgare] grass-clover [Lolium perenne/Trifolium repens] grass-clover barley/pea [Pisum arvénse] winter wheat [Tritucum aestivum] fodder beet [Beta vulgaris]) from 1994 until 1998. The importance of climatic conditions and use of different organic manure types at different application rates for sulphate leaching were investigated and related to the concurrent nitrate leaching. As an average of years, sulphate leaching from the crop rotation was 20 kg S ha-1, which was equivalent to 60% of the total input to the rotation.... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2000 |
URL: http://orgprints.org/144/1/text.doc |
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| Eriksen, J; Askegaard, M; Søegaard, K. |
| Due to increasing size of Danish organic dairy farms uniform grazing of all cropped land becomes inexpedient due to long distance to the milking facilities. We investigated nutrient dynamics and feed production in two dairy crop rotations with internal differences in proportion of grazing and cutting. One six year crop rotation represents close to the farm buildings (barley [Hordeum vulgare L.] undersown with grass-clover [Lolium perenne L.–Trifolium repens L.] - 4 years of grass-clover - spring barley/catch crop) and another represents further away (barley undersown with grass-clover, 2 years of grass-clover -barley/catch crop - maize [Zea mays L.]/catch crop - lupin [Lupinus angustifolius]/catch crop). In each of the crop rotations was made five... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/14641/1/27FA_Eriksen_el_al._final_paper.pdf |
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