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Registros recuperados: 5
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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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Globalisation as a challenge or opportunity for organic farming Organic Eprints
El-Nagger, Ahmed; Ounmaa, Andres; Muukka, Eija; Zaleckas, Ernestas; Abraityté, Gerda; Jansons, Imants; Rasmussen, Jim; Ahnström, Johan; Pirhofer-Walzl, Karin; Jensen, Katherine O’Doherty; Jørgensen, Kirstine F.; Sarunaite, Lina; Bleidere, Mara; Knudsen, Marie Trydeman; Pugliese, Massimo; Nielsen, Merete Højrup Møller; Mugurerza, Natalia Bellostas; Bakewell-Stone, Petra; Hansen, Preben Klarskov; Al-Kufaishi, Sermed Adil Abed-Ali; Kobayashi, Sofie; Rydberg, Torbjörn; Klubova, Vera; Liorancas, Viktoras; Høgh-Jensen, Henning.
During one intensive week in October 2005, the authors were gathered to discuss the impact that globalisation has on the Organic Food Systems and the opportunities that globalisation opens up for developing these systems. The meeting took place as a Ph.D. course under the auspices of the Research School of Organic Farming and Food Systems (SOAR; www.soar.dk). All participants research within Organic Agriculture and Food Production in one way or another.
Tipo: Journal paper Palavras-chave: Food security; Food quality and human health "Organics" in general Food systems Markets and trade Values; Standards and certification.
Ano: 2006 URL: http://orgprints.org/9333/1/9333.pdf
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N2-fixation and residual N effect of four legume species and four companion grass species Organic Eprints
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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Næringsstofdynamik i græsmarker med kløver og urter Organic Eprints
Pirhofer-Walzl, Karin; Korsgaard, Maren.
Der er ikke megen viden om urter i omdriftsgræsmarker. For at undersøge næringsstofdynamikken i græsmarker med kløver og urter udførte jeg markforsøøg på forsøgsgården i Foulum i 2007 og 2008. Forsøgene viser at urter har et potentiale til at forbedre en kløvergræsmark.
Tipo: Report chapter Palavras-chave: Crop health; Quality; Protection Weed management Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/27431/6/27431.pdf
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Performance of multi-species grassland mixtures. Mineral accumulation, nitrogen transfer and nitrogen uptake Organic Eprints
Pirhofer-Walzl, Karin.
This thesis is located within the framework of research on temperate agricultural grasslands. Plant diversity in temperate agricultural grasslands is impoverished today. Many conventional grasslands in Europe consist of simple grass mixtures, sometimes monocultures. Organic and increasingly conventional grasslands are sown as mixtures of grasses and legumes and from time to time as multi-species mixtures that include forage herbs. Temporary grasslands are regularly resown or incorporated in a crop rotation and produce ruminant fodder. Some studies indicate that various forage herbs have traits that may complement grass-legume mixtures; among others, increased macro- and micromineral concentration. Hence multi-species grassland mixtures, comprising grasses,...
Tipo: Thesis Palavras-chave: Crop combinations and interactions.
Ano: 2011 URL: http://orgprints.org/20646/4/20646.pdf
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