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Registros recuperados: 38
Primeira ... 12 ... Última
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A model simulation analyses of nitrate leaching – does soil organic matter pool structure or catch crop growth parameters matter most? Organic Eprints
Pedersen, Anders; Petersen, Bjørn Molt; Eriksen, Jørgen; Hansen, Søren; Jensen, Lars Stoumann.
Modelling of soil organic matter (SOM) turnover has often been developed in order to or to predict crop fertilser demand or to analyse environmental impact of different agriculture management practices. Mechanistic simulation models can be used to predict the mineralization of nitrogen (N) in added organic matter, e.g. from animal manure or incorporated crop residues, and the timing of N availability to the succeeding crops. In this way, mechanistic models may be used to avoid excessive fertilisation and hence to minimise nitrate leaching. The objective of this work was therefore to analyse the consequences of applying different SOM and crop modules (differing in pool structure or parameterisation) in the soil-plant-atmosphere model Daisy on the simulated...
Tipo: Journal paper Palavras-chave: Nutrient turnover Crop combinations and interactions Recycling; Balancing and resource management Air and water emissions.
Ano: 2007 URL: http://orgprints.org/4622/2/4622.pdf
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Afgræsning af græsblandinger med bælgplanter og cikorie Organic Eprints
Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen.
Græsblandinger med hvidkløver, rødkløver, lucerne og cikorie havde alle en god foderkvalitet og gav mulighed for en høj produktion af differentieret mælk ved betydelig grad af afgræsning. Det kræver afgræsningssystemer tilpasset den enkelte græsblanding at få en optimal produktion.
Tipo: Newspaper or magazine article Palavras-chave: Farming Systems.
Ano: 2007 URL: http://orgprints.org/10845/1/10845.pdf
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Carbon footprint from cheese produced on milk from Holstein and Jersey cows feed hay differing in proportion of herbs Organic Eprints
Kristensen, Troels; Søegaard, Karen; Eriksen, Jørgen; Mogensen, Lisbeth.
The objective of the study was to assess the impact on emission of green house gasses (GHG) from production of cheese based on milk from different type of hay and breed of cows, and as an integrated part to give figures for emission from production of hay in climate lees favorable for on field hay drying. Emission of GHG was estimate using life cycle assessment with kg of milk and kg of energy corrected milk (ECM) delivered to the dairy factory, and kg of cheese at the retailor level in Denmark as functional units. Allocation at farm gate, between milk and meat, was made by biological relation between energy requirement to milk and meat production or economic allocation and at the dairy between cheese and whey using either economic allocation or system...
Tipo: Journal paper Palavras-chave: Production systems; Farm economics; Air and water emissions; Biodiversity and ecosystem services.
Ano: 2014 URL: http://orgprints.org/26477/7/26477.pdf
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Comparative environmental assessment of three systems for organic pig production in Denmark Organic Eprints
Halberg, Niels; Hermansen, John E.; Kristensen, Ib Sillebak; Eriksen, Jørgen; Tvedegaard, Niels.
Organic pig production has emerged as an alternative to the intensive conventional pig production in Europe with the animals confined indoors and often an imbalance between livestock and land for feed production and manure utilisation. The organic systems aim at improving animal welfare by supporting the pig’s natural behaviour (Hermansen et al., 2003), and improving soil fertility by better linking crop and livestock production from an agro-ecological point of view. The differences between organic and conventional pig production is more fundamental than for example differences between dairy production systems, which may be why the share of pig herds within the organic holdings is considerably lower than the percentage of pig herds in conventional...
Tipo: Conference paper, poster, etc. Palavras-chave: Environmental aspects; Pigs.
Ano: 2008 URL: http://orgprints.org/15585/1/15585.pdf
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Design af kløvergræsmarker med urter til kvægfoder Organic Eprints
Søegaard, Karen; Eriksen, Jørgen.
Urter, som etableres sammen med kløvergræs, er udsat for stærk konkurrence. Nogle kan klare sig, mens andre har brug for hjælp. Hvis græsmarkerne reelt skal være artsrige, er det derfor nødvendigt at designe græsmarkerne, så der tages hensyn til de enkelte urters konkurrenceevne.
Tipo: Newspaper or magazine article Palavras-chave: Pasture and forage crops.
Ano: 2015 URL: http://orgprints.org/29968/1/NyKvaegforskning%20_2_2015.pdf
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Ecological properties of earthworm burrows in an organically managed grass-clover system Organic Eprints
Krogh, P.H.; Lamandé, M.; Eriksen, Jørgen; Holmstrup, Martin.
Earthworms have long been recognized for their soil engineering capacities. Since the creation of the ecosystem service concept the utilitarian perception of nature has gained a lot of attention and funding for research. Hence, we selected earthworms and their burrowing activities to enable an assessment of their influence on water movement and nutrient release. The study went on in autumn where earthworm population densities and their burrowing activities were quantified in plots of third year clover-grass crops differing in fertilisation and the manner of removing the biomass either by grazing or cutting. We found very high biomasses as expected for clover-grass about 200 g wet earthworm weight m-2. The common earthworm association typical to our region...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Biodiversity and ecosystem services; Farm nutrient management.
Ano: 2001 URL: http://orgprints.org/20690/9/20690b.pdf
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EcoServe: Økosystem Funktioner og Services af Biodiversitet i Græsmarker Organic Eprints
Eriksen, Jørgen; Thomsen, Henning C..
Multifunktionalitet med positive effekter på natur og samfund er et centralt element i økologisk jordbrug, og høj biodiversitet er afgørende herfor. Græsmarker har det største potentiale for at yde denne service, men økologiske græsmarker er store og biodiversiteten på dyrkningsfladen er lav.
Tipo: Web product Palavras-chave: Dairy cattle Pasture and forage crops Food security; Food quality and human health Recycling; Balancing and resource management Markets and trade Biodiversity and ecosystem services Consumer issues.
Ano: 2011 URL: http://orgprints.org/20056/1/index.html
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Effect of deep-rooted plant species on 15Nitrogen uptake and herbage yield in temporary agricultural grasslands Organic Eprints
Pirhofer-Walzl, K.; Eriksen, Jørgen; Rasmussen , Jim; Soegaard, Karen; Høgh-Jensen, Henning; Rasmussen, Jesper.
Aim is to ncrease of plant diversity has been suggested to enhance grassland productivity and resource use efficiency. Most studies on agricultural grasslands have focused on functional diversity of mixtures comprising legumes and non-legumes, but there is little knowledge of plant nutrient acquisition from deep- and shallow-rooted grassland plant species. To investigate whether deep-rooted (chicory: Cichorium intybus L.; Lucerne: Medicago sativa L.) and shallow-rooted (perennial ryegrass: Lolium perenne L.; white clover: Trifolium repens L.) grassland plant species differ in herbage yield and depth dependent soil N-access, we investigated in the field if 1) a mixture comprising shallow- and deep-rooted grassland plant species has greater herbage yields...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions.
Ano: 2012 URL: http://orgprints.org/20647/4/20647.pdf
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Effect of four plant species on soil 15N-access and herbage yield in temporary agricultural grasslands Organic Eprints
Pirhofer-Walzl, Karin; Eriksen, Jørgen; Rasmussen , Jim; Høgh-Jensen, Henning; Søegaard, Karin; Rasmussen, Jesper.
Positive plant diversity-productivity relationships have been reported for experimental semi-natural grasslands (Cardinale et al. 2006; Hector et al. 1999; Tilman et al. 1996) as well as temporary agricultural grasslands (Frankow-Lindberg et al. 2009; Kirwan et al. 2007; Nyfeler et al. 2009; Picasso et al. 2008). Generally, these relationships are explained, on the one hand, by niche differentiation and facilitation (Hector et al. 2002; Tilman et al. 2002) and, on the other hand, by greater probability of including a highly productive plant species in high diversity plots (Huston 1997). Both explanations accept that diversity is significant because species differ in characteristics, such as root architecture, nutrient acquisition and water use efficiency,...
Tipo: Journal paper Palavras-chave: Crop husbandry; Biodiversity and ecosystem services; Environmental aspects.
Ano: 2013 URL: http://orgprints.org/23296/1/PLANT%20AND%20sOIL.pdf
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Effect of Herbage on Milk Composition Organic Eprints
Fretté, Xavier C.; Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen; Sørensen, John; Nielsen, Jacob H..
A grazing study was performed in 2006 over three two-week periods in May, June and August at the organic research station Rugballegaard, Denmark, where a herd of 48 Holstein dairy cows was split into four groups of 12 cows. Each group grazed one of four swards: 1) lucerne, 2) red clover, 3) white clover and 4) white clover with chicory, all four in mixture with perennial ryegrass. Milk and grass samples were analyzed to study the effect of each sward type on milk composition as well as seasonal variations.
Tipo: Working paper Palavras-chave: Denmark.
Ano: 2008 URL: http://orgprints.org/14796/1/Artikel_milk%2Dgrass%2Dcomposition%2D2008%2D09%2D23.doc
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Environmental life cycle assessment of organic grass protein from multispecies mixtures Organic Eprints
Knudsen, Marie Trydeman; Dorca-preda, Teodora; Djomo, Sylvestre Njakou; Kristensen, Troels; Ambye-Jensen, Morten; Møller, Henrik B.; Dupont, Y.L.; Cong, W-F; Eriksen, Jørgen.
Including grass leys in organic arable rotations has potentially several benefits such as suppression of certain weeds, increased biodiversity (i.e. pollinators), increased soil carbon sequestration and productivity among others. The biomass from the grass mixtures can be refined into protein feed concentrate for monogastrics that can partly replace imported soybean, while the fibre fraction can be used as ruminant feed or for biogas. The grass mixtures can also be used directly for biogas. Increasing diversity of the mixtures will potentially also increase the yield stability and the benefits for biodiversity (pollinators), while the number of cuts per year will also have an effect. Thus, the use of multispecies mixtures in organic arable rotation for...
Tipo: Journal paper Palavras-chave: Air and water emissions; Biodiversity and ecosystem services.
Ano: 2020 URL: http://orgprints.org/35188/1/Knudsen%20et%20al.%20%28manuscript%29%20Environmental%20LCA%20of%20organic%20grass%20protein.doc
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Exchangeable potassium and potassium balances in organic crop rotations on a coarse sandy soil Organic Eprints
Askegaard, Margrethe; Eriksen, Jørgen; Olesen, Jørgen E..
Crops on sandy soils (<5% clay) are exposed to K deficiency due to the small release and high leaching losses of K. Reliable tools are needed to improve the K management in cropping systems with limited K input, such as organic farming where import of nutrients are restricted according to the EC regulations. We investigated K balances and exchangeable K (Kexch) changes in an organic crop rotation experiment. Potassium leaching decreased from 42 kg ha-1 in 1998/99 to 21 kg ha-1 in 2000/01 as an average of a crop rotation (spring barley, grass-clover, winter wheat and pea/barley) with manure application and without catch crops. In the same period, spring Kexch decreased from 5.0 to 3.0 mg K 100 g-1 soil (0-20 cm). The retention of the straw K left in the...
Tipo: Journal paper Palavras-chave: Nutrient turnover Crop combinations and interactions Cereals; Pulses and oilseeds Air and water emissions Composting and manuring.
Ano: 2003 URL: http://orgprints.org/3898/1/3898.pdf
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Exchangeable potassium in soil as indicator of potassium status in an organic crop rotation on loamy sand. Organic Eprints
Askegaard, Margrethe; Eriksen, Jørgen.
In organic agriculture, where K may be a limited resource, reliable tools are important in the assessment of K availability in the soil in order to avoid K deficiency. We investigated the effect of four organic farming systems on the exchangeable K in the plough layer of a six-course crop rotation from 1994 to 1997. The accumulated K balances over the four years varied between -49 and +120 kg K ha-1 and the corresponding exchangeable K (0-20 cm) in autumn 1997 was 7.1 and 9.6 mg K 100 g soil-1, respectively, as an average of the crop rotation. The exchangeable K fraction responded to the K application in manure and to the crop in the rotation. In an additional experiment, no yield response to K was found, despite a low level of exchangeable K. The...
Tipo: Journal paper Palavras-chave: Farming Systems.
Ano: 2002 URL: http://orgprints.org/391/1/AE2002.pdf
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FieldEco – a multi-purpose biologically driven food web model Organic Eprints
Axelsen, Jørgen Aagaard; Sønderskov, Mette; Bruus-Pedersen, Marianne; Tybirk, Knud; Eriksen, Jørgen.
We here present a food web model (FieldEco) that has been constructed to simulate complicated eco-system processes in a food web that includes both the soil and above ground ecosystems and connec-tions between them. FieldEco has been designed to work at the species level. The model is driven by climatic input, and both the population dynamics and the interactions between species are simulated according to the ideas presented by Gutierrez (1996). FieldEco is equipped with a user interface from which it is possible to design an ecosystem of interest from a list of parameterised species. Presently, this list of parameterised species consists mainly of species that are common in Danish agricultural fields, and it is possible to manipulate their biological...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Soil biology; Biodiversity and ecosystem services.
Ano: 2004 URL: http://orgprints.org/4659/2/4659.pdf
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Forage herbs improve mineral composition of grassland herbage Organic Eprints
Pirhofer-Walzl , K.; Søegaard, Karen; Høgh-Jensen, Henning; Eriksen, Jørgen; Sanderson, M.A.; Rasmussen , Jim; Rasmussen, Jesper.
Provision of an adequate mineral supply in the diets of ruminants fed mainly on grassland herbage can present a challenge if mineral concentrations are suboptimal for animal nutrition. Forage herbs may be included in grassland seed mixtures to improve herbage mineral content, although there is limited information about mineral concentrations in forage herbs. To determine whether herbs have greater macro- and micromineral concentrations than forage legumes and grasses, we conducted a 2-year experiment on a loamy-sand site in Denmark sown with a multi-species mixture comprised of three functional groups (grasses, legumes and herbs). Herb species included chicory (Cichorium intybus L.), plantain (Plantago lanceolata L.), caraway (Carum carvi L.) and salad...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions.
Ano: 2011 URL: http://orgprints.org/19333/1/19333.pdf
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Full or partial outdoor rearing of slaughter pigs – effects on performance, carcass quality and nutrient load Organic Eprints
Hermansen, John E.; Eriksen, Jørgen; Strudsholm, Karin.
An experiment with slaughter pigs from weaning to slaughter including five treatments and five replicates was carried out at the Danish organic experimental station, Rugballegård. Treatments included full or partial outdoor rearing of the pigs, and the replicates covered the seasonal effects. Pigs fed ad libitum indoors had a significantly lower feed consumption (5 MJ ME /kg gain), a lower lean percentage (2.3% points), and a higher backfat depth (1.1 mm, P < 0.05) than pigs fed ad libitum outdoors. Compared with outdoor pigs fed ad libitum, restricted feeding outdoors resulted in a significantly lower daily gain (107 g), a lower feed consumption (6.3 MJ ME/kg gain), higher lean percentage (2.1% points), and a reduced backfat (1.8 mm) (P <0.001). The...
Tipo: Conference paper, poster, etc. Palavras-chave: Pigs.
Ano: 2005 URL: http://orgprints.org/4368/4/4368%2DHermansen_etal_4p_revised%2Ded.pdf
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Græsmarkens sammensætning og mælkens smag Organic Eprints
Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen.
Enclosed files were presented at workshop april 3rd 2008
Tipo: Report Palavras-chave: Crop combinations and interactions; Feeding and growth.
Ano: 2008 URL: http://orgprints.org/19690/1/19690a.pdf
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Har søers rodeintensitet indflydelse på udvaskning - eller nytter tryneringning overhovedet Organic Eprints
Studnitz, Merete; Eriksen, Jørgen; Strudsholm, Karin.
Det er en almindelig antagelse, at tryneringning af udegående søer mindsker udvaskning af nitrat og andre næringsstoffer fra græsmarkerne, og at miljøet dermed skånes. Man kan se, at ringning forhindrer søerne i at rode, hvorved græsdækket holdes intakt på en stor del af marken det meste af året. Men fak-tisk ved vi ikke, om udvaskningen fra en mark med ringede søer er mindre end fra en mark, hvor søer kan rode. Det er vist, at der er væsentlig udvaskning fra områder omkring fodersted, sølehuller og hyt-ter fra marker, hvor søerne har været tryneringet. Det kan tænkes at denne punktforurening er værre for vandmiljøet end en jævn spredning af samme forurening. Fra forsøg med ringede og ikke ringede søer ved vi, at søerne ikke lider ved at have trynering....
Tipo: Journal paper Palavras-chave: Pigs.
Ano: 2002 URL: http://orgprints.org/1880/1/Oko%2Dkongres_2002.doc
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Herbs in grasslands - effect of slurry and grazing/cutting on species composition and nutritive value Organic Eprints
Søegaard, Karen; Eriksen, Jørgen; Askegaard, Margrethe.
Herbs are established in many organic grasslands due to their expected beneficial properties for nutritive value and biodiversity. However, knowledge about grassland herbs is limited. Three mixtures were therefore established at different grazing/cutting management and slurry applications. The competitiveness of the species varied greatly. Plantain (Plantago lanceolata) and lucerne (Medicago sativa) competed best under cutting; in contrast, chicory (Cichorium intybus) competed best under grazing. Caraway (Carum carvi), burnet (Poterium sanguisorba) and lotus (Lotus corniculatus) had a relative low competitiveness. Slurry application did not affect the proportion of non-leguminous herbs. The nutritive value differed: caraway had the highest and plantain the...
Tipo: Conference paper, poster, etc. Palavras-chave: Pasture and forage crops.
Ano: 2008 URL: http://orgprints.org/14677/1/editor_soegaard.pdf
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Impact of organic pig production systems on CO2 emission, C sequestration and nitrate pollution Organic Eprints
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
Registros recuperados: 38
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