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| Registros recuperados: 24 | |
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| Rasmussen, I.A.; Meier, J.; Willer, H.. |
| Organic Eprints is an Open Access archive for research in organic food and farming. While based in Europe, it is international and open for deposits from all over the world. Since the start in 2002, the archive has steadily grown to over 10,000 deposits in 2010. Open Access enables more users to download and read the deposited papers, and this may lead to increased citations. Development of a platform based on Organic Eprints among other agriculture-related archives should make search even stronger. All researchers who work with organic food and farming are encouraged to register and deposit their work in Organic Eprints. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Technology transfer; Research communication and quality. |
| Ano: 2011 |
URL: http://orgprints.org/19568/7/19568a.pdf |
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| Holst, N.; Rasmussen, I.A.; Bastiaans, L.. |
| Mathematical modelling is a commonly used tool for studying the long-term dynamics of weed populations in agriculture. This was reflected in our review by the large number of scientific papers (134 original publications) and the continuing need to gain an overview over this fast developing field (20 previous review papers were found). In this article, we provide a more comprehensive review than earlier seen, striving to include all relevant publications. Thus, we cover models of the population dynamics of 60 weed species in 40 crops. An online, accompanying database provices an indexed bibliography. Despite the large variation in crops, weeds and geography, the models were surprisingly similar in their approach: structured around the weed life cycle,... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2007 |
URL: http://orgprints.org/11345/1/wre534.pdf |
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| Rasmussen, I.A.; Askegaard, M.; Olesen, J.E.; Kristensen, K.. |
| We investigated the effects on annual weeds of location, weed control, manure application and catch crops and their interactions in a crop rotation with cereals and pulses for grain during conversion to organic farming in order to better understand the combined effects of management. An experiment with a four-year crop rotation (spring barley/undersown ley, grass-clover, winter wheat, pea/barley) was carried out from 1997 to 2000 under organic conditions at three locations in Denmark with four treatments: with and without catch crop, and with and without manure. Mechanical weed control was reduced or absent in cereals or pulses with undersown catch crops or grass-clover. Manure application increased weed biomass, but not the proportion of total biomass... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Weed management. |
| Ano: 2006 |
URL: http://orgprints.org/7904/1/7904.pdf |
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| Rasmussen, I.A.; Askegaard, M.; Olesen, J.E.. |
| A crop rotation experiment was established in 1997 at three locations representing different soil types and climates. Three factors were tested: crop rotation, catch crop and manure. Catch crop reduced nitrate leaching, but prohibited stubble cultivation. The use of catch crops resulted in increased levels of perennial weeds (E. repens) at one location, while at another; the level of C. arvense was not affected by catch crops, when compared with the use of stubble cultivation. Management of perennial weeds should include considerations of where in a crop rotation to use stubble cultivation, and this should preferably not be after a pulse crop. Catch crops are a more profitable way to manage C. arvense than stubble cultivations. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Weed management. |
| Ano: 2005 |
URL: http://orgprints.org/6070/1/6070a.pdf |
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| Rasmussen, I.A.; Halberg, N.. |
| An analysis of the effect of 15 years of research in organic food systems in Denmark showed that it has had a high impact on the development of the sector. There are three main reasons: First of all, the content of research programs and the funded projects have been closely aligned with the needs of the industry as expressed by farmers, advisors and organizations. Second, many of the projects have had close contact to advisors and farmers securing continuous dissemination resulting in rapid application of results. Third, due to the close contact between researchers and users the research design has been adapted to ensure that treatments to be tested are as relevant and practical as possible, without compromising the scientific standards. Besides the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Research communication and quality. |
| Ano: 2013 |
URL: http://orgprints.org/23220/8/23220a.pdf |
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| Rasmussen, I.A.; Bastiaans, L.; Holst, N.; Grundy, A.; Melander, B.. |
| A three-day workshop on modelling weed population dynamics partially sponsored by the European Weed Research Society (EWRS) was held in October 2006 at Research Centre Flakkebjerg. 24 participants attended the workshop from 8 countries, mainly Europe and USA. The aim of the workshop was to gather some of those active and interested in the field, i.e. most of the participants had either published papers on weed population dynamic models or had a model under development. By gathering these people, it was our hope to learn from each other and possibly benefit by increasing the knowledge and use of each other's work. The EWRS saw the workshop as an opportunity to interconnect some of the work going on in (at least) three working groups: Weed Seed Germination... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2007 |
URL: http://orgprints.org/11348/1/WeedDynamics_keynote_Rasmussen_rev2.doc |
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| Rasmussen, I.A.; Askegaard, M.; Olesen, J.E.. |
| Catch crops reduced nitrate leaching in both rotations at Jyndevad. The same tendency was seen in one rotation at Flakkebjerg. At Jyndevad, stubble cultivations decreased Elymus repens density in the treatments without catch crops. Application of manure decreased the E. repens density in one rotation. At Flakkebjerg, there was a lower infestation of C. arvense in the rotation with than without grass-clover, with least biomass in the crop the year after grass-clover. There was no significant difference between the biomass of C. arvense in the treatments with and without catch crop, in spite of the fact that stubble cultivations and row hoeing were carried out without catch crops. The reason was most likely that the nutrients retained in the topsoil by the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Weed management. |
| Ano: 2007 |
URL: http://orgprints.org/11346/1/abs_6.1_Ilse_Rasmussen.doc |
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| Rasmussen, I.A.; Askegaard, M.; Olesen, J.E.. |
| In long-term organic crop rotation experiments for cereal production, stubble cultivation to control perennial weeds increased nitrogen leaching compared to catch crops grown after harvest. Stubble cultivation contributed to the control of Elymus repens on a sandy soil, but not to the control of Cirsium arvense on a loamy soil. Manure application had a tendency to decrease E. repens density in one rotation at the sandy soil. Grass-clover green manure decreased C. arvense in the succeeding crops. Despite high infestations of perennial weeds, yields were at the same level with as without stubble cultivation. The results point to an important dilemma in organic farming: should the farmer control perennial weeds in the stubble at the expense of losing nitrogen... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Weed management. |
| Ano: 2005 |
URL: http://orgprints.org/6072/1/6072a.pdf |
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| Rasmussen, I.A.; Bastiaans, L.; Holst, N.; Grundy, A.; Melander, B.. |
| A three-day workshop on modelling weed population dynamics partially sponsored by the European Weed Research Society (EWRS) was held in October 2006 at Research Centre Flakkebjerg. 24 participants attended the workshop from 8 countries, mainly Europe and USA. The aim of the workshop was to gather some of those active and interested in the field, i.e. most of the participants had either published papers on weed population dynamic models or had a model under development. By gathering these people, it was our hope to learn from each other and possibly benefit by increasing the knowledge and use of each other's work. The EWRS saw the workshop as an opportunity to interconnect some of the work going on in (at least) three working groups: Weed Seed Germination... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2007 |
URL: http://orgprints.org/11347/1/Ilse_Rasmussen%2D06%2D02.doc |
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| Grundy, A.C.; Peters, N.C.B.; Rasmussen, I.A.; Hartmann, K.A.; Sattin, M.; Andersson, L.; Mead, A.; Murdoch, A.J.; Forcella, F.. |
| Experiments with the germination of two weed species from different origins under different climatic conditions has led to modelling their germination and emergence. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2002 |
URL: http://orgprints.org/1476/2/1476.pdf |
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| Rasmussen, I.A.; Askegaard, M.; Olesen, J.E.. |
| Long-term control of perennial weeds create a challenge in organic farming, especially in ar-able farming. Perennial weeds are most often controlled by tillage, often stubble tillage after harvest of cereals or short-term tillage during the summer (Melander et al., 2005). Tillage leads to increased leaching of nutrients (Askegaard et al., 2005), which is unacceptable for the environment and in turn renders the succeeding crop less competitive compared to the peren-nial weeds – thus initiating a vicious circle. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Weed management. |
| Ano: 2007 |
URL: http://orgprints.org/11349/1/NJF07_10_Rasmussen2.doc |
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| Holst, N.; Rasmussen, I.A.; Bastiaans, L.. |
| We evaluated models of weed population dynamics based on an analysis of their assumptions, biological rationale, flexibility, documentation, accessibility, demand for parameter estimation and documented validity. We arrived at general recommendations regarding which modelling approach should be applied in order to address different application domains. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2005 |
URL: http://orgprints.org/6060/1/6060.pdf |
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| Rasmussen, I.A.. |
| Cirsium arvense is difficult to control and mechanical control may result in yield loss or nutrient leaching. Growing a competitive crop such as grass clover has earlier been seen to reduce the infestation. This paper describes a test of different competitive crops (oilseed rape and fibre hemp) comparing the infestation with that occurring with one or two years of grass clover. Oilseed rape did not grow well and was not very competitive, while C. arvense infestation was reduced the year after growing fibre hemp or grass-clover. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Weed management. |
| Ano: 2011 |
URL: http://orgprints.org/19571/7/19571a.pdf |
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| Cirujeda, A.; Melander, B.; Rasmussen, K.; Rasmussen, I.A.. |
| Field trials were made at a single Danish and two Spanish locations. In Denmark winter wheat was sown at 24 cm spacing allowing hoeing in the inter-row area. Hoeing speeds of 2, 5 and 8 km h-1 were tested at the end of tillering, at the beginning of stem elongation and at both times. The crop was harrowed immediately afterwards at the same speed. In the Spanish locations the winter barley was sown at a spacing of 12 cm and harrowed only at either pre-emergence plus post-emergence or once post-emergence at mid-tillering at 2, 4, 6 and 8 km h-1. The depth of the soil layer thrown into the cereal row was measured. This layer ranged between 0.4 cm and 1.4 cm depending on the site and on the treatment, but was generally higher with a single treatment at all... |
| Tipo: Journal paper |
Palavras-chave: Weed management Cereals; Pulses and oilseeds. |
| Ano: 2003 |
URL: http://orgprints.org/1521/1/WR_Cirujedaetal.pdf |
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| Grundy, A.C.; Peters, N.C.B.; Rasmussen, I.A.; Hartmann, K.A.; Sattin, M.; Andersson, L.; Mead, A.; Murdoch, A.J.; Forcella, F.. |
| The emergence behaviour of weed species in relation to cultural and meteorological events was studied. Dissimilarities between populations in dormancy and germination ecology, between-year maturation conditions and seed quality and burial site climate, all contribute to potentially unpredictable variability. Therefore, a weed emergence data set was produced for weed seeds of Stellaria media and Chenopodium album matured and collected from three populations (Italy, Sweden and UK). The seeds were collected in two consecutive seasons (1999 and 2000) and subsequently buried in the autumn of the same year of maturation in eight contrasting climatic locations throughout Europe and the USA. The experiment sought to explore and explain differences between the... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2003 |
URL: http://orgprints.org/1472/1/1472.pdf |
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| Registros recuperados: 24 | |
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