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Registros recuperados: 137
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Mangfoldighed i den økologiske græsmark Organic Eprints
Eriksen, J.; Strandberg, B.; Søegaard, K..
Anvendelse af mange-arts-blandinger i græsmarker til produktion kan øge nytteværdien i form af forbedrede vilkår for bestøvende insekter, øget ressourceudnyttelse, kulstoflagring, udbyttestabilitet, husdyrsundhed og produktkvalitet. Det er hypotesen i et nyt projekt – EcoServe - hvor målet er at designe græsmarker, som både øger naturværdien og giver en økonomisk bæredygtig fødevareproduktion.
Tipo: Newspaper or magazine article Palavras-chave: Biodiversity and ecosystem services.
Ano: 2011 URL: http://orgprints.org/19890/4/19890.pdf
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Mangfoldighed i den økologiske græsmark Organic Eprints
Eriksen, J.; Strandberg, B.; Søegaard, K..
Mange-arts-blandinger i græsmarker til produktion kan øge nytteværdien i form af forbedrede vilkår for bestøvende insekter, øget ressourceudnyttelse, kulstoflagring, udbyttestabilitet, husdyrsundhed og produktkvalitet. Det er udgangspunktet i et projekt – EcoServe - hvor målet er at designe græsmarker, som både øger naturværdien og giver en økonomisk rentabel produktion.
Tipo: Newspaper or magazine article Palavras-chave: Soil; Biodiversity and ecosystem services.
Ano: 2012 URL: http://orgprints.org/22045/7/22045.pdf
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Mangfoldighed i marken Organic Eprints
Eriksen, J..
Mange arter øger nytteværdien, og målet i et nyt projekt er at designe græsmarker, som både øger naturværdien og giver en økonomisk bæredygtig fødevareproduktion.
Tipo: Newspaper or magazine article Palavras-chave: Biodiversity and ecosystem services.
Ano: 2011 URL: http://orgprints.org/19889/1/19889.pdf
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Measurement of CO2 evolution in situ Organic Eprints
Vinther, F.P.; Eriksen, J..
Soil respiration is a major flux in the global carbon cycle, and accurate measurement of soil CO2 efflux is crucial in ecosystem carbon budgets. The CO2 efflux is the result of two processes; namely the CO2 production from root and soil respiration, and the transport of CO2 to the atmosphere. Traditionally, soil CO2 fluxes have been measured in chambers covering small patches of the soil by using either a static chamber method, where enclosures are left for 24 hr. and CO2 is collected in soda lime, or a dynamic chamber method, where enclosures are left for a shorter period (minutes) during which CO2 is registered with an infrared gas analyzer. These chamber methods have a number of disadvantages including soil disturbance while placing the chamber,...
Tipo: Conference paper, poster, etc. Palavras-chave: Air and water emissions.
Ano: 2001 URL: http://orgprints.org/1815/1/Finn_Vinther_and_Jorgen_Eriksen.doc
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Miljøeffekter af trynering og græsmarksstyring Organic Eprints
Eriksen, J..
Ved Danmarks JordbrugsForskning er undersøgt effekten af ringning for både drægtige og diegivende søer. Formålet var samtidigt at undersøge effekten af trynering og dyretæthed på adfærd, græsdække og næringsstofafsætning. I forsøget, som foregik fra maj til slutningen af september, indgik søer med og uden ring. For søer uden ring anvendtes enten kontinuert brug af samme fold eller dobbelt belægning og foldskifte halvvejs.
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Pigs; Air and water emissions.
Ano: 2006 URL: http://orgprints.org/10047/1/10047.doc
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Multispecies grasslands for crop productivity and carbon storage Organic Eprints
Eriksen, J.; Mortensen, T.; Søegaard, K..
Organic grasslands have long been recognized for their provision of ecosystem functions and services and this may be further increased by inclusion of appropriate herb species. Inclusion of herb species in grasslands has in the present experiment shown to increase yield stability. Furthermore, the data presented here has indicated some potential of species known to have deeper and denser rooting systems to increase belowground biomass, an important asset for C sequestration in grasslands
Tipo: Conference paper, poster, etc. Palavras-chave: Pasture and forage crops; Nutrient turnover; Air and water emissions.
Ano: 2013 URL: http://orgprints.org/24521/1/24521.pdf
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N2-fixation and residual effect of four legume species and four companion grass species Organic Eprints
Rasmussen, J.; Søegaard, K.; Eriksen, J..
Inclusion of forage legumes in low-input forage mixtures improves herbage production and soil fertility through addition of nitrogen (N) from N2-fixation. The impact of different grass–legume mixtures on the N contribution of the forage mixture has rarely been investigated under comparable soil and climatic conditions. We conducted a field experiment on a sandy soil at two nitrogen levels with seven twospecies forage mixtures: alfalfa, bird’s-foot trefoil, red clover, or white clover in mixture with perennial ryegrass, and white clover in mixture with meadow fescue, timothy, or hybrid ryegrass. We found high N2- fixation of more than 300 kg N ha−1 from both red clover and alfalfa even when the two mixtures received 300 kg total-N ha−1 in cattle slurry....
Tipo: Journal paper Palavras-chave: Crop combinations and interactions; Farm nutrient management.
Ano: 2012 URL: http://orgprints.org/20635/4/20635.pdf
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Nitrate leaching and N2-fixation in grasslands of different composition, age and management Organic Eprints
Eriksen, J.; Vinther, F.P..
Cut grassland systems usually have high N efficiency and consequently low nitrate leaching, whereas the introduction of grazing animals increases the loss potential dramatically (Jarvis, 2000). It has been demonstrated that nitrate leaching from unfertilised grass-clover swards is lower than from mineral-N fertilized swards grazed by cattle. The possible explanation for this is that the N2 fixation by pasture legumes is regulated by a natural feedback mechanism driven by soil inorganic N levels. The feedback mechanism acts as a limit to N inputs from legumes and consequently regulates the potential for N losses (Ledgard, 2001). Here is reported 5 years of nitrate leaching from four cropping sequences with different grassland frequency and management for...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover.
Ano: 2004 URL: http://orgprints.org/3666/1/3666.doc
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Nitrate leaching and N2-fixation in grasslands of different composition, age and management Organic Eprints
Eriksen, J.; Vinther, F.P..
Introduction Cut grassland systems usually have high N efficiency and consequently low nitrate leaching, whereas the introduction of grazing animals increases the loss potential dramatically (Jarvis, 2000). It has been demonstrated that nitrate leaching from unfertilised grass-clover swards is lower than from mineral-N fertilised swards grazed by cattle. The possible explanation for this is that the N2 fixation by pasture legumes is regulated by a natural feedback mechanism driven by soil inorganic N levels. The feedback mechanism acts as a limit to N inputs from legumes and consequently regulates the potential for N losses (Ledgard, 2001). In this paper we report 5 years (1997-2002) of nitrate leaching from four cropping sequences with different...
Tipo: Conference paper, poster, etc. Palavras-chave: Surveys and statistics.
Ano: 2003 URL: http://orgprints.org/1409/1/Eriksen.doc
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Nitrate leaching and N2-fixation in grasslands of different composition, age and management Organic Eprints
Eriksen, J.; Vinther, F.P.; Søegaard, K..
Grass-legume associations may offer a way of improving the N efficiency of dairy farming, but may also have adverse impact on the environment by increased leaching losses. Nitrate leaching from four cropping sequences with different grassland frequency and management (long-term grazed, long-term cut, cereals followed by 1 and 2-year grazed leys) were investigated on a loamy sand in central Jutland for both unfertilised grass-clover (perennial ryegrass [Lolium perenne L.]/white clover [Trifolium repens L.]) and fertilised perennial ryegrass (300 kg N/ha) during 1997-2002. Furthermore, one year (2001) of N2 fixation in 1, 2 and 8-year-old grass-clover pastures was determined. Nitrate leaching from grazed unfertilised grass-clover was always considerably...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2004 URL: http://orgprints.org/3664/1/3664.pdf
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Imprime registro no formato completo
Nitrate leaching and N2-fixation in grasslands of different composition, age and management Organic Eprints
Eriksen, J.; Vinther, F.P..
Cut grassland systems usually have high N efficiency and consequently low nitrate leaching, whereas the introduction of grazing animals increases the loss potential dramatically (Jarvis, 2000). It has been demonstrated that nitrate leaching from unfertilised grass-clover swards is lower than from mineral-N fertilised swards grazed by cattle. The possible explanation for this is that the N2 fixation by pasture legumes is regulated by a natural feedback mechanism driven by soil inorganic N levels. The feedback mechanism acts as a limit to N inputs from legumes and consequently regulates the potential for N losses (Ledgard, 2001). In this paper we report 5 years (1997-2002) of nitrate leaching from four cropping sequences with different grassland frequency...
Tipo: Conference paper, poster, etc. Palavras-chave: Pasture and forage crops; Production systems.
Ano: 2003 URL: http://orgprints.org/1822/1/Eriksen.doc
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Nitrate leaching and spring wheat bread making quality following cultivation of grasslands of different composition, age and management Organic Eprints
Eriksen, J.; Pedersen, L.; Jørgensen, J.R..
The influence of sward botanical composition and ley age on grassland residual effects, quality of spring wheat and subsequent nitrate leaching was investigated. Grazed grasslands of different age (1, 2 and 8 production years) and composition (unfertilised grass-clover and fertilised perennial ryegrass) were ploughed and followed by spring wheat and spring barley. For reference, an adjacent field without grassland history but with the same crop sequence in 2002-2003 was treated with increasing quantities of N fertiliser. Yields and N uptake of spring wheat following grasslands always exceeded those of the reference plots with a history of cereal production. The nitrogen fertiliser replacement values of grass-clover and ryegrass were 59-100 and 72-121 kg...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Soil; Air and water emissions.
Ano: 2006 URL: http://orgprints.org/10042/1/10042.pdf
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Nitrate leaching following cultivation of contrasting temporary grassland. Organic Eprints
Eriksen, J.; Søegaard, K..
The N-surplus in grazed grassland is much higher than in cut grassland. Therefore, the residual effects of three years of temporary grassland on nitrate leaching in the following cereal crop were determined. Grassland managements were either cut leys or grazing with dairy cows in both pure grass and grass-clover mixtures. The cows were fed two levels of N in the supplements. Grassland management had little effect on the subsequent nitrate leaching, which ranged from 6 to 36 kg N ha-1, even though the surplus after three years of grassland ranged from 36 to 984 kg N ha-1. This indicates that substantial losses occurred during the grassland period. Application of fertiliser-N to the cereals had a much larger effect on nitrate leaching. It is concluded that...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2000 URL: http://orgprints.org/149/1/437.ppt
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Nitrate leaching from an organic dairy crop rotation: the effect of manure type, N-input and improved crop rotation Organic Eprints
Eriksen, J.; Askegaard, M.; Kristensen, K..
Four management systems combining high and low livestock densities (0.7 and 1.4 LU ha-1) and different types of organic manure (slurry and straw based FYM) were applied to an organic dairy crop rotation (barley [undersown] – grass-clover – grass-clover – barley/pea – oats – fodder beet) between 1998 and 2001. The effects of the management systems on crop yields and nitrate leaching were measured. In all four years nitrate leaching, as determined using ceramic suction cups, was higher in the three crops following ploughing of grass-clover than under the barley or grass-clover. Overall, no significant differences in nitrate leaching were observed between the management systems. However, the replacement of the winter wheat crop used in the earlier...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2004 URL: http://orgprints.org/1824/1/paper.doc
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Nitrate leaching from silage maize Organic Eprints
Hansen, E.M.; Eriksen, J..
During the last 20 years the area with maize in Denmark has increased dramatically and reached 163,000 ha in 2008. Silage maize is easy to grow, is a suitable fodder for cows and goes well with grass-clover in the diet. This means that silage maize is often found in crop rotations with grass-clover on sandy soils in western Denmark. The ploughing in of grass-clover fields poses a serious risk of increased nitrate leaching on a coarse sandy soil, even when carried out in spring. With increased maize cropping, there is therefore a need for strategies to reduce nitrate leaching after ploughing of grass-clover.In the ICROFS project, OrgGrass, we examined the effect of catch crop and slurry application on nitrate leaching from maize after a spring-ploughed...
Tipo: Newspaper or magazine article Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2009 URL: http://orgprints.org/17876/1/17876.pdf
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Nitrate leaching in crop rotations with grass-clover as influenced by sward age, grazing, cutting and fertilizer regimes Organic Eprints
Eriksen, J.; Askegaard, M.; Søegaard, K..
Grazing animals have profound effects on pastoral systems including nutrient removal by grazing and redistribution through excreta. Generally, in grazed pastures the conversion of consumed N into product is low and a substantial quantity of N (>70%) is recycled through the direct deposition of animal excreta. This low N utilization by grazing animals reflects the relatively high concentrations of N required for metabolic functions and optimum growth of plants compared to that needed by the grazing ruminant for amino acid and protein synthesis (Haynes and Williams, 1993). Increasing the N concentration in grass, such as by increasing the rate of N fertiliser application, can result in a substantial N surplus (i.e. N inputs – N outputs in products). For...
Tipo: Journal paper Palavras-chave: Air and water emissions; Farm nutrient management.
Ano: 2012 URL: http://orgprints.org/20637/4/20637.pdf
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Nitrate leaching in grazed grasslands of different composition and age Organic Eprints
Eriksen, J.; Vinther, F.P..
In a field experiment at Research Centre Foulum a suction cup technique was used to investigate nitrate leaching from grassland depending on composition (grass-clover or perennial ryegrass), management (grazing or cutting) and age of the swards. In 1997-2001 was investigated the successive nitrate leaching from 4-7 year old grazed grass-clover and ryegrass with cut plots of similar age and spring barley as reference. In 2000-2001 the simultaneous nitrate leaching from newly established swards, swards grazed for 1 and 7 years and swards cut for 7 years was investigated. In the newly established swards nitrate leaching from grass-clover and ryegrass were similar but at increasing sward age nitrate leaching from the fertilized ryegrass increased dramatically...
Tipo: Book chapter Palavras-chave: Nutrient turnover.
Ano: 2002 URL: http://orgprints.org/160/1/cfp404.pdf
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Nitrate leaching in maize after ploughing of grass-clover Organic Eprints
Hansen, E.M.; Eriksen, J..
No summary yet
Tipo: Journal paper Palavras-chave: Air and water emissions; Farm nutrient management.
Ano: 2012 URL: http://orgprints.org/20648/1/art_majs09.pdf
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Nitratudvaskning fra majs Organic Eprints
Hansen, E.M.; Eriksen, J..
Gennem de sidste 20 år er majsarealet i Danmark steget kraftigt, og i 2008 blev der dyrket majs på 163.000 ha. Majs til ensilage er let at dyrke og passer godt ind i en foderplan med kløvergræs til malkekøer. Majs indgår derfor ofte i sædskifter med kløvergræs på sandet jord. Ompløjning af kløvergræs udgør en risiko for øget udvaskning af nitrat fra grovsandet jord, selv hvis der pløjes om foråret. Med den øgede majsdyrkning er der behov for effektive strategier til at reducere nitratudvaskningen i majs efter ompløjning af kløvergræs. I FØJO III-projektet OrgGrass har vi undersøgt effekt af efterafgrøde og gylletilførsel på nitratudvaskning fra majs efter forårspløjet kløvergræs.
Tipo: Newspaper or magazine article Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2009 URL: http://orgprints.org/17873/1/17873.pdf
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Nitrogen and sulphur management: challenges for organic sources in temperate agricultural systems Organic Eprints
McNiel, A.M.; Eriksen, J.; Bergström, L.; Smith, K.S.; Marstorp, H.; Kirschmann, H.; Nilsson, I..
A current global trend towards intensification or specialization of agricultural enterprises has been accompanied by increasing public awareness of associated environmental consequences. Air and water pollution from losses of nutrients, such as nitrogen (N) and sulphur (S), are a major concern. Governments have initiated extensive regulatory frameworks, including various land use policies, in an attempt to control or reduce the losses. This paper presents an overview of critical input and loss processes affecting N and S for temperate climates, and provides some background to the discussion in subsequent papers evaluating specific farming systems. Management effects on potential gaseous and leaching losses, the lack of synchrony between supply of nutrients...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2005 URL: http://orgprints.org/5470/1/5470.pdf
Registros recuperados: 137
Primeira ... 1234567 ... Última
 

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