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| Registros recuperados: 38 | |
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| 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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| Pirhofer-Walzl, K.; Rasmussen , Jim; Høgh-Jensen, Henning; Eriksen, Jørgen; Soegaard, Karen; Rasmussen, Jesper. |
| Legumes play a crucial role in nitrogen supply to grass-legume mixtures for ruminant fodder. To quantify N transfer from legumes to neighbouring plants in multi-species grasslands we established a grass-legume-herb mixture on a loamy-sandy site in Denmark. White clover (Trifolium repens L.), red clover (Trifolium pratense L.) and lucerne (Medicago sativa L.) were leaflabelled with 15N enriched urea during one growing season. N transfer to grasses (Lolium perenne L. and xfestulolium), white clover, red clover, lucerne, birdsfoot trefoil (Lotus corniculatus L.), chicory (Cichorium intybus L.), plantain (Plantago lanceolata L.), salad burnet (Sanguisorba minor L.) and caraway (Carum carvi L.) was measured. Neighbouring plants contained greater amounts of N... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions. |
| Ano: 2012 |
URL: http://orgprints.org/20645/4/20645.pdf |
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| Søegaard, Karen; Sehested, Jakob; Eriksen, Jørgen; Askegaard, Margrethe; Mogensen, Lisbeth; Jensen, Søren K.. |
| Urter i græsmarken er blevet undersøgt i forsøg på fem økologiske kvægbrug og ved Foulum. Vækst, konkurrenceevne, foderværdi og mineralindhold i de enkelte arter i tre forskellige blandinger er undersøgt for betydningen af gylletilførsel, slæt/afgræsning og markens alder, og variation mellem gårde er beskrevet. De enkelte urter viste generelt det samme mønster på de forskellige steder, hvilket gør det muligt med generelle konklusioner. En oversigt over konklusioner for de enkelte urter er vist på sidste side af bilaget. Cikorie og vejbred var de stærkeste og indeholdt derudover en stor andel mineraler. Kommen var også forholdsvis stærk, især under slætforhold. Bibernelle og kællingetand var forholdsvis svage konkurrenter, men mange steder var der dog en... |
| Tipo: Report chapter |
Palavras-chave: Farming Systems; Animal husbandry; Feeding and growth; Farm nutrient management. |
| Ano: 2010 |
URL: http://orgprints.org/17910/1/17910.pdf |
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| Rasmussen , Jim; Søegaard, Karen; Pirhofer-Walzl, Karin; Eriksen, Jørgen. |
| 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 two-species 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: Pasture and forage crops. |
| Ano: 2011 |
URL: http://orgprints.org/19451/4/19451.pdf |
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| Askegaard, Margrethe; Eriksen, Jørgen. |
| . In organic farming, potassium (K) deficiency may become a significant problem due to import restrictions. Knowledge about potential K leaching in systems with different K budgets is therefore important for effective agricultural management. We investigated the effect of four organic farming systems (two livestock densities in combination with two types of organic manure) on crop yields, K leaching and K balances in a six course crop rotation from 1993/94 to 1997/98. Average K concentrations in soil water extracted by means of ceramic suction cups at 1 m depth were 0.6 mg K l-1 corresponding to a K leaching loss of 1.5 kg ha-1 yr-1,which was less than expected from values reported in the literature. Variation in K budgets from –12 to +30 kg ha-1 yr-1 did... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems. |
| Ano: 2000 |
URL: http://orgprints.org/390/1/AE2000.pdf |
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| Eriksen, Jørgen; Høgh-Jensen, Henning. |
| Biological N2 fixation in clover is an important source of N in low external-N input farming systems. Using the natural 15N-abundance method, variations in N2 fixation were investigated in grazed and mowed plots of a ryegrass/white clover field. Ryegrass 15N varied considerably, from 0.2 to 5.6‰ under mowed conditions and from -3.3 to 11.6‰ under grazed conditions. Variations in 15N in white clover were lower than in ryegrass, especially in the mowed plots (SE = 0.05‰, n = 20). The variations in the percentage of nitrogen derived from the atmosphere (%Ndfa) in white clover were highest in the grazed plots where it ranged from 12 to 96% (mean = 64%) compared with the mowed plots where it ranged from 64 to 92% (mean = 79%). Thus, the N2 fixation per unit... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 1998 |
URL: http://orgprints.org/139/1/PLSO7762.doc |
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| Müller-Stöver, Dorette; Hauggaard-Nielsen, Henrik; Eriksen, Jørgen; Ambus, Per; Johansen, Anders. |
| A laboratory incubation study with clover grass pasture soils of seven different ages (0, 1, 2, 3, 4, 5, and 16 production years) was carried out to determine initial soil carbon (C) and nitrogen (N) stocks and potentials for greenhouse gas emissions (N2O and CO2). Compared with the soil from the recently established pasture, an increase of total soil C and N was observed along with pasture age. Greenhouse gas emissions were low and not significantly different among the soils from younger pastures (0–5 years), but especially N2O emissions increased markedly in the soil from 16-year-old grass–clover. Low emissions might mainly be due to an early C limitation occurring in the soils from younger pastures, which was also corroborated by decreasing levels of... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general Composting and manuring Recycling; Balancing and resource management Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/20915/7/20915.pdf |
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| 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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| Müller-Stöver, Dorette; Hauggaard-Nielsen, Henrik; Eriksen, Jørgen; Ambus, Per; Johansen, Anders. |
| A laboratory incubation study with clover grass pasture soils of six different ages (0, 1, 2, 3, 4, 5, and 16 production years) was carried out to determine initial soil carbon (C) and nitrogen (N) stocks and their effects on initial greenhouse gas (GHG) emissions (N2O and CO2) after soil incorporation of the grass-clover pastures. Compared to the soil from the recently established pasture, a significant increase of total soil C and N was observed after 2 years, which was generally increasing with pasture age. GHG emissions were not significantly different among the soils from younger pastures (0 to 5 years), but especially N2O emissions increased markedly in the soil from 16-year old grass-clover. This might mainly be due to an early carbon limitation... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general Composting and manuring Recycling; Balancing and resource management Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/18978/4/18978.pdf |
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| Søegaard, Karen; Eriksen, Jørgen; Mortensen, Tine B.. |
| There is growing interest in establishing highly biodiverse grasslands that are also capable of maintaining high yields. In order to design successful multispecies mixtures it is necessary to know the competitiveness of individual species and how different management regimes affect this. Some species can survive in highly productive pastures, while others need nursing in special mixtures if they are to make a significant contribution to the forage. This is investigated in the ECOSERVE project and has also been studied in the earlier ORGGRASS project. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Pasture and forage crops. |
| Ano: 2013 |
URL: http://orgprints.org/24759/6/24759.pdf |
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| 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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| 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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| 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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| Registros recuperados: 38 | |
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