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| Registros recuperados: 117 | |
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| Holst, Niels; Riemens, Marleen; Rasmussen, Ilse A.. |
| Perennial herbs can be difficult to manage because of their underground storage organs which live sheltered from observation and control. In this paper, we describe the development of a population dynamics model for two perennial weeds, Cirsium arvense and Tussilago farfara. The model is physiologically based and includes plant growth and development, and mowing as a control option. Model performance was compared with field data from monospecific stands of C. arvense in Denmark and Netherlands and of T. farfara in Denmark. Finally, optimal mowing strategies were explored with the model. |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2012 |
URL: http://orgprints.org/20650/4/20650.pdf |
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| Holst, Niels; Melander, Bo; Rasmussen, Ilse A.; Hansen, Preben Klarskov. |
| Field studies on perennial weeds, such as Cirsium arvense, are necessary to study the systemic effects of weed control. In this study we analyse the responses in above-ground C. arvense biomass and crop yield from results obtained in two organic field experiments, both combining stubble cultivation with post-harvest catch crops. A range of catch crops was investigated, varying in both species mixture and method of establishment, yet stubble cultivation was the only treatment found to reduce C. arvense density. The effect was even seen only in one year when a harsh winter acted synergistically with soil tillage. C. arvense exhibited density-dependent growth, in terms of above-ground biomass at harvest, with an estimated max. exponential growth rate of... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2012 |
URL: http://orgprints.org/20590/4/20590.pdf |
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| Rasmussen, Ilse A.; Holst, Niels. |
| A simulation model of the population dynamics of annual weeds and how it is affected by crop rotation, cultivation practices and weed control was presented by Rasmussen et al. (2002). The model aims to predict the development of a certain weed species in order to plan crop rotation and cultivation practices to minimise the risk of proliferation. The model does not predict the exact number of weeds expected to be found in a certain year or crop, but rather the general development over a number of years. It included the most important processes of the weed life cycle: seed survival in the soil, seed placement in soil after tillage, seed germination depending on soil depth, time of year and tillage and weed physiological development. The component describing... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2004 |
URL: http://orgprints.org/3933/1/3933.doc |
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| Rasmussen, Ilse A.; Holst, Niels. |
| We developed a simple model to predict seed production from seedling density and estimated its six parameters for Chenopodium album and Papaver rhoeas from literature data, supplemented with field data on P. rhoeas seed production in Denmark. Parameter values were specified by their expected ranges rather than just point estimates, which enabled us to determine the expected ranges of seed production at given seedling densities. The model will be incorporated into a larger model framework presented earlier for a more complete description of annual weed seedbank dynamics in a crop rotation. We found the seed production (y) of P. rhoeas to be larger than reported earlier from UK; the relation to weed biomass (x) per m2 was curvilinear, y=6015∙x0.8153 seeds... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2003 |
URL: http://orgprints.org/3434/1/3434.doc |
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| Olesen, Jørgen E.; Askegaard, Margrethe; Rasmussen, Ilse A.. |
| The possibilities for increasing grain yields and reducing N leaching losses in organic ce-real production through manipulation of crop rotation design were investigated in a field experiment on different soil types in Denmark from 1997 to 2000. Three experimental fac-tors were included in the experiment in a factorial design: 1) proportion of grass-clover and pulses in the rotation, 2) catch crop (with and without), and 3) manure (with and with-out). Three four-course rotations were compared (Table 1). Two of the rotations had one year of grass-clover as a green manure crop, either followed by spring wheat or by winter wheat. The grass-clover was replaced by winter cereals in the third rotation. Animal ma-nure was applied as slurry in rates corresponding... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2003 |
URL: http://orgprints.org/1809/1/B0071.doc |
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| Rasmussen, Ilse A.; Jensen, Allan Leck. |
| The OK-Net Arable project has launched a platform aimed at filling the gap in the exchange of information between farmers across Europe. Farmers’ needs were taken into account at every stage of development in order to make it easy for them to use. The platform is available in 10 languages (English, Bulgarian, Danish, Dutch, Estonian, French, German, Hungarian, Italian and Latvian) and the solutions are divided according to the most relevant topics in organic arable farming: Soil quality and fertility, nutrient management, pest and disease control, weed management and solutions for specific crops. Not only can farmers and advisors find solutions and engage with each other, they can also propose solutions. The intention is that this will help fill the... |
| Tipo: Report |
Palavras-chave: Knowledge management. |
| Ano: 2016 |
URL: http://orgprints.org/32268/1/OK_Net_WP4_D4.1_Knowledge%20Platform_20161013.pdf |
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| Kata, Gócs; Rasmussen, Ilse A.; Moeskops, Bram; Padel, Susanne; Micheloni, Cristina; Willer, Helga. |
| This deliverable is part work package 4 of the OK-Net Arable Horizon 2020 project, which started on 1 March 2015 and finished on 28 February 2018. The aim of OK-Net Arable is to promote and exchange knowledge among farmers, farm advisers and scientists with the objective to increase productivity and quality in organic arable cropping all over Europe. Within the 3-year project, a knowledge platform was created (farmknowledge.org) to provide access to a wide range of tools and resources, that can help to improve organic production. While, the platform was launched in October 2016, it was platform was continuously improved during the course of the project and tools were added until the end of the project. Setting up the farmknowledge platform was a success.... |
| Tipo: Report |
Palavras-chave: Crop husbandry; Knowledge management. |
| Ano: 2018 |
URL: http://orgprints.org/36334/1/OK_Net_Arable_D4.4_17_May.pdf |
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| Rasmussen, Ilse A.; Thomsen, Henning C.; Askegaard, Margrethe; Olesen, Jørgen E.. |
| Kløvergræs opformerer kvik, men reducerer tidsler. Efterafgrøder opformerer kvik, men ikke tidsler, sammenlignet med stubbearbejdning. Når man har problemer med rodukrudt, er det vigtigt at forstå, hvordan sædskifte og andre kulturforanstaltninger påvirker rodukrudtet, både på kort og langt sigt. Desværre findes der kun få data for den langsigtede effekt af kløvergræs som grøngødning og efterafgrøder på rodukrudt. I det økologiske sædskifteforsøg (Askegaard et al. 2004), som blev anlagt i 1996, har vi fulgt udviklingen af især kvik og tidsler frem til nu, og det giver os mulighed for at udtale os om betydningen af de forskellige faktorer. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Weed management. |
| Ano: 2006 |
URL: http://orgprints.org/7923/1/7923_paper.pdf |
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| Melander, Bo; Rasmussen, Ilse A.; Holst, Niels; Hansen, Preben Klarskov. |
| Perennial weeds can be a major constraint to organic crop production in several North European 26 countries. Preventive and cultural control measures may not suffice when infestations with perennials 27 become severe. Direct control actions applied between crops can then be necessary to reduce the 28 problems. We conducted two experiments, one on a sandy loam and one on a sandy soil, respectively, in 29 Denmark, with the aim of studying the efficacy of different implement types and strategies. The 30 treatments were employed against mixed stands of perennials after harvest of spring barley in two 31 consecutive years. Time of treatment, cultivation depth and combinations of implements constituted the 32 strategies. Treatment effects were evaluated in the... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2012 |
URL: http://orgprints.org/22000/7/22000.pdf |
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| Melander, Bo; Rasmussen, Ilse A.; Holst, Niels; Hansen, Preben Klarskov. |
| Perennial weeds can be a major constraint to organic crop production in several North European 26 countries. Preventive and cultural control measures may not suffice when infestations with perennials 27 become severe. Direct control actions applied between crops can then be necessary to reduce the 28 problems. We conducted two experiments, one on a sandy loam and one on a sandy soil, respectively, in 29 Denmark, with the aim of studying the efficacy of different implement types and strategies. The 30 treatments were employed against mixed stands of perennials after harvest of spring barley in two 31 consecutive years. Time of treatment, cultivation depth and combinations of implements constituted the 32 strategies. Treatment effects were evaluated in the... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2011 |
URL: http://orgprints.org/20625/4/20625.pdf |
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| Rasmussen, Ilse A.; Sønderskov, Mette; Damgaard, Christian; Kristensen, Kristian. |
| The impact of crop rotation, nutrient levels and use of catch crops on effect of E. repens on a sandy soil at Jyndevad on yield of winter wheat (2006), spring barley (2007-2008) and faba bean (2006-2008) was studied in an existing organic crop rotation experiment (Olesen et al., 2000; Rasmussen et al., 2006). Some of the objectives were to determine the yield loss at different levels of infestation of the weed, and to determine whether this relationship was influenced by the treatments. For all crops, the treatments had a high impact on the yield. The two treatments that had no manure applied for up to 12 years consistently had the lowest yields. In spring barley, the two treatments with manure and with catch crops consistently had the highest yields. In... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Weed management. |
| Ano: 2009 |
URL: http://orgprints.org/18379/1/18379a.pdf |
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| Rasmussen, Ilse A.; Melander, Bo; Askegaard, Margrethe; Kristensen, Kristian; Olesen, Jørgen E.. |
| Elytrigia repens is a rhizomatous perennial weed prevalent in organic cropping systems in Scandinavia. This study analysed the population dynamics of E. repens in a long-term crop rotation experiment on coarse sand in Denmark in order to gain insights into the factors influencing its population changes, especially those important for outbreaks of E. repens infestations. Data were obtained from three cycles of four-year crop rotations with various cash crops and annual grass-clover subjected to four treatment combinations: with and without animal manure and with and without catch crops. E. repens was controlled by different tillage and mowing strategies between and within crops. Pulses and spring cereals caused the highest population increases, especially... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2014 |
URL: http://orgprints.org/25677/13/25677.pdf |
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| Bliss, Katie; Padel, Susanne; Cullen, Beth; Ducottet, Charline; Mullender, Samantha; Rasmussen, Ilse A.; Moeskops, Bram. |
| Organic farming is knowledge intensive. To support farmers in improve yields and organic agriculture systems, there is a need to improve how knowledge is shared. There is an established culture of sharing ideas, successes and failures in farming. The internet and information technologies open-up new opportunities for knowledge exchange involving farmers, researchers, advisors and other practitioners. The OK-Net Arable brought together practitioners from regional Farmer Innovation Groups across Europe in a multi-actor project to explore how online knowledge exchange could be improved. Feedback from the groups was obtained for 36 'tools', defined as end-user materials, such as technical guides, videos on websites informing about practices in organic... |
| Tipo: Journal paper |
Palavras-chave: Soil tillage Education; Extension and communication Weed management. |
| Ano: 2018 |
URL: http://orgprints.org/32860/2/Bliss_Exchanging%20knowledge_32860.pdf |
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| Registros recuperados: 117 | |
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