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| Lamandé, M.; Eriksen, J.; Krogh, P.H.; Jacobsen, O.H.. |
| Organic dairy farming is characterized by grazing cows in contrast to Danish conventional farms where the majority of cows are kept indoors. Cattle trampling reduces the finer macroporosity in the top 5-10 cm of the soil. This causes a low infiltration capacity at the soil surface, giving a higher probability of macropore flow from the surface. Rapid water movement through macropores bypasses the soil matrix, reducing nitrate leaching. We investigated how three years of cattle trampling in organic grass-clover fields could influence the risk of nitrate leaching in the autumn. The experimental part of this study was situated in Denmark on a loamy sand within a long-term organic dairy crop rotation trial. Experimental plots were irrigated with a concentrated... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions; Biodiversity and ecosystem services. |
| Ano: 2010 |
URL: http://orgprints.org/20676/5/20676.pdf |
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| Schjønning, P.; Iversen, B.V.; Jacobsen, O.H.. |
| Mængden af organisk stof, som man påvirker med almindelig landbrugsdrift, har ikke nævneværdig indflydelse på jordens vandholdende evne. Anvendelse af husdyrgødning i stedet for mineralsk gødning kan heller ikke forventes at påvirke jordens ledningsevne for vand i pløjelaget. I forhold til ekstreme driftsformer med et ensidigt (korn-)sædskifte og uden anvendelse af organisk gødning vil en økologisk driftsform give både et større porevolumen og et mere forgrenet poresystem. Et højt næringsstofniveau giver – uanset tildelingsmetode – flere store porer og bedre ledningsevne for vand i jordlaget under pløjedybde. |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Soil quality; Composting and manuring. |
| Ano: 2004 |
URL: http://orgprints.org/7763/1/7763.doc |
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| Jacobsen, O.H.; Vinther, F.P.; Schjønning, P.; Hansen, E.M.; Eriksen, J.. |
| I Danmark har det høj prioritet, at vi kan drikke vores grundvand uden rensning. Der er en voksende erkendelse af, at rent grundvand kun kan opretholdes gennem en aktiv indsats. Amterne udpeger områder med særlig drikkevandsinteresser og efterfølgende zonerer de for arealer der er særlig nitrat- og pesticidfølsomme. En perspektivrig mulighed for at regulerede i forureningsfølsomme om-råder kan være, at man udlagde større sammenhængende arealer med økologisk jordbrug. Først og fremmest undgår man helt brug af pesticider. For kvælstof, vil tabet være afhængig af det økologi-ske dyrkningssystem og det er det der er fokus for denne undersøgelse. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Farm nutrient management; Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/5957/1/5957.doc |
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| Lamandé, M.; Eriksen, J.; Krogh, P.H.; Jacobsen, O.H.. |
| Managed grasslands are characterized by rotations of leys and arable phases. Soil structure is inherited from the last tillage operations (ploughing, harrowing) and evolves during the leys because of climate, earthworms and roots activity, fertilisation, cutting operations or cattle trampling. We tested the effects of the duration of the leys, cattle trampling, and fertilisation on the infiltration of water in the soil profile in managed grasslands. The experiment was situated within the dairy crop rotation on loamy sand at the Foulum experimental farm (Denmark). Irrigation experiments were performed in the 1st and the 3rd year of pasture, with or without slurry application or grazing, and in winter rye. Each plot was irrigated during an hour with 18.5 mm... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions; Biodiversity and ecosystem services. |
| Ano: 2012 |
URL: http://orgprints.org/20673/4/20673.pdf |
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