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| Registros recuperados: 65 | |
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| Rasmussen, Jesper; Helgadóttir, Á.; Frankow-Lindberg, B.; Loges, R.; Eriksen, J.. |
| Sources of inorganic and organic N leaching from grass-clover mixtures at field sites in Denmark, Germany and Iceland were investigated. Grass or clover was labelled with 15N-urea four times (autumn 2007, spring, summer and autumn 2008) prior to the leaching season in autumn and winter 2008. Soil water was sampled at 30 cm depth and analyzed for 15N-enrichment of dissolved inorganic N (DIN) and dissolved organic N (DON). Most 15N was recovered in DON for both labelled grass and clover at all sites. At the Danish site, grass and clover contributed more to the DON pool than the DIN whereas the opposite was observed at the German and Icelandic sites. The results show that both clover and grass contribute directly to N leaching from the root zone in mixtures,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Nutrient turnover. |
| Ano: 2010 |
URL: http://orgprints.org/17880/4/17880.pdf |
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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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| Henriksen, Christian Bugge; Rasmussen, Jesper; Søgaard, Carsten. |
| In the original ridge tillage system as practiced in the US Corn Belt, ridges are formed during the growing season. Several studies have documented that this can reduce leaching of nutrients and improve fertilizer efficiency. This study was conducted to determine whether ridges formed in autumn can be used as an alternative to ploughing to reduce N leaching during autumn and winter, and thereby increase growth and N uptake of a subsequent unfertilized crop. A factorial field experiment with tillage and residues as factors was conducted during 1998-2000. Tillage treatments were autumn ridging and ploughing. Residue treatments were stubble, stubble+straw and stubble+liquid manure in order to create a gradient of C/N ratios. From the time of harvest until... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Farming Systems; Soil tillage. |
| Ano: 2005 |
URL: http://orgprints.org/3952/1/3952.pdf |
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| Rasmussen, Jesper; Kaltoft, Pernille. |
| Holdninger er vigtige, selvbekræftende og konservative Nogle holdninger er overfladiske, mens andre er dybe, da de er kædet sammen med basale værdier hos det enkelte menneske. Det er de dybere holdninger, vi beskæftiger os med i det følgende. Denne type holdninger har betydning for hvordan vi oplever og forstår verden, og hvordan vi handler. Holdningerne og værdierne hjælper os med at finde sammenhæng og mening i tilværelsen, og de får os til at føle harmoni mellem det vi opfatter som rigtigt, og det vi gør. Holdninger er selvbekræftende, fordi vi har behov for at opleve sammenhæng mellem oplevelse, forståelse og handling. De dybe holdninger er konservative, fordi vi ikke kan ændre dem fra den ene dag til den anden. Dette er godt, fordi vi ville komme... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Surveys and statistics. |
| Ano: 2002 |
URL: http://orgprints.org/450/1/Holdninger%2Dkons.pdf |
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| Rueda-Ayala, Victor; Rasmussen, Jesper; Gerhards, Roland. |
| Side effects of herbicides and increasing prevalence of organic farming nduce the need of further developments in mechanical weed control. Mechanical weed control is mainly associated with cultivating tillage (e.g. tertiary tillage), but also primary and secondary tillage influence weeds. Cultivating tillage is performed in growing crops with harrows, hoes, brushes and a number of special tools for intra-row weed control. Inter-row cultivations have been used in many decades in row crops and perform in general well. To increase their capacity and accuracy, guidance systems are important to steer the hoes along the rows. The success of inter- and intra-row cultivation is highly influenced by selectivity factors. The control mechanisms of all cultivating... |
| Tipo: Book chapter |
Palavras-chave: Soil tillage; Weed management. |
| Ano: 2010 |
URL: http://orgprints.org/17843/4/17843.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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| Brandsæter, Lars O.; Mangerud, Kjell; Rasmussen, Jesper. |
| Pre- and post-emergence weed harrowing were studied in spring cereals in different environments and with two types of harrows in Norway during 2004–2006. The objectives were to investigate interactions between pre and post-emergence weed harrowing and the importance of harrow type. We hypothesised that pre- and post-emergence harrowing interact positively, that a combination gives more stable weed control effects than pre- and post-emergence weed harrowing used alone, and that a harrow type with bent tines is more aggressive and suitable on hard-packed soils than a harrow with strait tines. The results only supported the last of these hypotheses. Post-emergence weed harrowing controlled a certain percentage of the present weeds, and this percentage was... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2012 |
URL: http://orgprints.org/21137/4/21137.pdf |
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| Registros recuperados: 65 | |
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