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Registros recuperados: 24
Primeira ... 12 ... Última
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15 years of research in organic food systems in Denmark – effects on the sector and society Organic Eprints
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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'All models are wrong - but some are useful' - a report from an EWRS workshop on modelling weed population dynamics Organic Eprints
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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Computer model for simulating the long-term dynamics of annual weeds under different cultivation practices Organic Eprints
Rasmussen, I.A.; Holst, N.; Pedersen, L.; Rasmussen, K..
A model is being developed which describes the population dynamics of annual weeds and how it is affected by crop rotation, cultivation practices and weed control. The model aims to predict the development of a certain weed species in order to plan crop rotation and cultivation practices to minimize 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. The model includes documented knowledge, as well as informal expert knowledge, on seed survival in the soil, seed placement in soil after tillage, seed germination with respect to placement in soil, time of year and tillage, weed development in response to crop competitiveness...
Tipo: Conference paper, poster, etc. Palavras-chave: Production systems; Weed management.
Ano: 2002 URL: http://orgprints.org/1506/1/EWRS_pcwc02_Rasmussen_IA.pdf
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Crop rotation and crop management effects on cereal yields in arable organic farming in Denmark Organic Eprints
Olesen, J.E.; Askegaard, M.; Rasmussen, I.A.; Kristensen, K..
One of the main challenges in organic crop production is to ensure high and stable crop yields. In this study we used data from a 12 year old crop rotation experiment in Denmark to estimate the contribution of various management factors to yields of winter and spring cereals. The experiment included three factors in two replicates: 1) Grass-clover green manure crop (with and without), 2) catch crop (with and without), and 3) animal manure (with and without). Animal manure was the most important factor for increasing grain yield of cereal crops, but also grass-clover and catch crop contributed considerably to increasing yields. The grass-clover had a larger long-term effect on grain yields on the sandy loam soils than on the sandy soil. Yields were...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop combinations and interactions Cereals; Pulses and oilseeds Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/20050/1/ISOFAR_Yield_Final_.pdf
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Development of weeds in organic crop rotation experiments Organic Eprints
Rasmussen, I.A.; Askegaard, M.; Olesen, J.E..
Weeds are a major problem in organic farming. Preventive as well as curative measures must be utilised to manage the weeds and avoid proliferation. Besides direct weed control measures, many different aspects of planning and management in the cropping system affect the proliferation of weeds. However, it has rarely been investigated how the whole system affects weed populations.
Tipo: Conference paper, poster, etc. Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Weed management.
Ano: 2005 URL: http://orgprints.org/6069/1/6069a.pdf
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Effects on weeds of management in newly converted organic crop rotations in Denmark Organic Eprints
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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Emergence of Chenopodium album and Stellaria media of different origins under different climatic conditions Organic Eprints
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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Emergence of Chenopodium album and Stellaria media under different climatic conditions Organic Eprints
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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Field weed population dynamics: a review of model approaches and applications Organic Eprints
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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Field weed population models: a review of approaches and application domains Organic Eprints
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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Kvik og tidsler i sædskifteforsøgene Organic Eprints
Rasmussen, I.A..
Effekten af tiltag mod kvik og tidsler er forskellig afhængig af jordtype, sædskifte, afgrøde, gødskning og år.
Tipo: Newspaper or magazine article Palavras-chave: Crop combinations and interactions; Weed management.
Ano: 2008 URL: http://orgprints.org/14678/1/OJ_08_407_12.pdf
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Long-term organic crop rotation experiments for cereal production - perennial weed control and nitrogen leaching Organic Eprints
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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Management of perennial weeds and nitrogen leaching in arable cropping systems Organic Eprints
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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OK-Net Arable online knowledge platform Organic Eprints
Rasmussen, I.A.; Jensen, A.L.; Jørgensen, M.S.; Kristensen, H.; Conder, M.; Micheloni, C.; Moeskops, B..
The complexity of organic farming requires farmers to have a very high level of knowledge and skills, but exchange on organic farming management techniques remains limited. The thematic network OK-Net Arable under Horizon 2020 has the aim to improve the exchange of innovative and traditional knowledge among farmers, farm advisers and scientists to increase productivity and quality in organic arable cropping in Europe. An online platform for knowledge exchange has been created, offering innovative education and end-user material as well as communication opportunities between actors. A number of specific tools – providing information about how to put existing knowledge from research and practice into use – have been chosen. They are presented on the platform...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop husbandry; Technology transfer.
Ano: 2017 URL: http://orgprints.org/31457/1/NJF_2017_495_Rasmussen_OKNETArable.doc
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Økologisk forskning og udvikling gennem 15 år - effekter i erhverv og samfund Organic Eprints
Halberg, N.; Kledal, P.R.; Rasmussen, I.A.; Mathiesen, C.; Sørensen, L.S.; Madsen, K.H..
ICROFS har lavet en samlet analyse af, hvilke effekter den danske økologiforskning i perioden 19996-2010 har haft på den økologiske sektor og samfundet i øvrigt. Denne publikation indeholder således analysens vigtigste konklusioner og sætter fokus på, hvordan resultaterne fra forskningsprogrammerne FØJO I-III samt CORE Organic er blevet brugt i erhverv og samfund.
Tipo: Report Palavras-chave: "Organics" in general.
Ano: 2012 URL: http://orgprints.org/22535/1/22535.pdf
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Økologiske sædskifter til korn - kan produktionen øges? Organic Eprints
Rasmussen, I.A.; Askegaard, M.; Olesen, J.E..
Hvordan kan sædskiftet indrettes så den økologiske kornproduktion øges uden at bæredygtigheden mindskes? Dette centrale spørgsmål belyses med nye resultater fra det økologiske sædskifteforsøg, der i 1996/97 blev anlagt på tre lokaliteter i Danmark og som nu har kørt to rotationer.
Tipo: Journal paper Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Weed management.
Ano: 2004 URL: http://orgprints.org/6071/1/6071.pdf
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Organic Eprints - making research in Organic Food and Farming more visible Organic Eprints
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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Organic Eprints - the international archive for research publications about organic agriculture Organic Eprints
Rasmussen, I.A..
Organic Eprints is an open, on-line archive for research in organic food and farming with more than 10,000 publications - and growing rapidly. There are 15,000 registered users of Organic Eprints. All use of the archive is free of charge. The archive contains scientific and popular articles, reports, presentations, project descriptions, books and other research publications. For each publication there is a short summary along with bibliographic and other information. In most cases, the full articles are freely available for download. The workshop aims to make the participants aquainted with Organic Eprints, so that they in the future can use the system for searching for research publications and other information about research in Organic agriculture and...
Tipo: Conference paper, poster, etc. Palavras-chave: Technology transfer; Research communication and quality.
Ano: 2011 URL: http://orgprints.org/19569/4/19569.pdf
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Organic research and development 1996-2010 - effects on industry and society Organic Eprints
Halberg, N.; Kledal, P.R.; Rasmussen, I.A.; Mathiesen, C.; Sørensen, L.S.; Jespersen, L.M.; Madsen, K.H..
This publication contains the most important conclusions from the analysis and focuses on how the results from the research programmes DARCOF I-III and CORE Organic have been implemented in industry and society.
Tipo: Report Palavras-chave: Research methodology and philosophy; Denmark.
Ano: 2012 URL: http://orgprints.org/22534/1/22534.pdf
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Perennial weed control and nitrogen leaching in long-term organic crop rotation experiments for cereal production Organic Eprints
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
Registros recuperados: 24
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