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| Registros recuperados: 30 | |
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| Rasmussen, Ilse A.; Hansen, Preben Klarskov. |
| Kornafgrøder og –sorter har forskellig evne til at undertrykke ukrudt. Dette skyldes blandt andet sortens evne til at skygge for lyset og optage vand og næringsstoffer. For sorter med en samlet god konkurrenceevne gælder at: de er langstråede de har kraftig bladmasse gennem vækstsæsonen de har en hurtig fremspiring og vækst Denne viden er udnyttet til at beregne et konkurrenceindeks af sorten overfor ukrudt. De fleste forsøg vedrørende disse forskelle er gennemført under konventionelle forhold, hvor niveauet af næringsstoffer er højt, og ukrudt og andre skadevoldere bekæmpes kemisk. Under økologiske forhold vil der oftest være en lavere og mere varierende forsyning med næringsstoffer. For at afklare om dette har en betydning for... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Crop combinations and interactions Weed management. |
| Ano: 2005 |
URL: http://orgprints.org/5917/1/5917.PDF |
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| Hansen, Preben Klarskov. |
| At the time for weed control, either chemical or physical, the potential yield of the crop (and thus the potential size of the yield loss due to weeds) is very uncertain, as only a minor part of the growing season has passed and the time for the major yield formation is after the weed control. The aim of this study was to investigate four scenarios of using sensor-based reflectance, vegetation cover- and canopy structure measurements in the early growth stages to estimate the potential yield of four pure spring barley varieties and four variety mixtures of spring barley grown in competition with weeds under two different nutrient levels in two years. |
| Tipo: Working paper |
Palavras-chave: Crop health; Quality; Protection Weed management. |
| Ano: 2007 |
URL: http://orgprints.org/11354/1/11354.doc |
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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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| 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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| Rasmussen, Ilse Ankjær; Holst, Niels; Graglia, Enrico; Hansen, Preben Klarskov; Melander, Bo; Mathiassen, Solvejg Kopp; Kudsk, Per; Jensen, Peter; Boelt, Birte; Madsen, Katrine Hauge. |
| Ukrudtsplanters livsprocesser, f.eks. spiring, vækst og blomstring, og samspil med andre organismer, f.eks. andet ukrudt, afgrøder og insekter. |
| Tipo: Book chapter |
Palavras-chave: Weed management. |
| Ano: 2004 |
URL: http://orgprints.org/4593/1/4593.pdf |
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| Lund-Nielsen, Tina; Mejer, Helena; Gunnarsson, Carina; Hansen, Preben Klarskov; Grigalaviciene, Ilona. |
| The document is an assessment for the SOAR summerschool in 2003, and describes the results from interviews with the scientists Dr. Johanna Björklund, Centre for Sustainable Agriculture, Swedish University of Agricultural Sciences, Sweeden and Ass. Prof. Dr. Thomas van Elsen, Department of Organic Farming and Cropping Systems, University of Kassel,Germany |
| Tipo: Report |
Palavras-chave: Research methodology and philosophy; Policy environments and social economy; "Organics" in general; Indicators and other value-laden measures; Landscape and recreation; Biodiversity and ecosystem services. |
| Ano: 2003 |
URL: http://orgprints.org/3487/1/3487.pdf |
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| Olesen, Jørgen E.; Hansen, Preben Klarskov; Berntsen, Jørgen; Christensen, Svend. |
| Cereal crop species and varieties differ in competitive ability against weeds mainly as influenced by differences in canopy architecture. The FASSET crop model was used to separate the effects of a number of crop traits on the suppressive ability of winter wheat varieties and the ability to tolerate weeds. The model simulated the competition between different varieties of winter wheat and a sown grass mixture for light, water and nitrogen. Crop physiological parameters of eight varieties and one variety mixture were estimated from measurements in a 3-year field experiment. The parameters estimated were thermal time from emergence to flag leaf appearance, thermal time from flag leaf appearance to anthesis, thermal time from anthesis to yellow ripeness,... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds Weed management. |
| Ano: 2004 |
URL: http://orgprints.org/3654/1/JEOA044.pdf |
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| Hansen, Preben Klarskov. |
| Controlling weeds in spring cereals grown under organic conditions is mostly done by post emergence weed harrowing, where spring tines of the weed harrow control weeds by uprooting and/or covering small weeds plants with soil. In situations with relatively large weed plants and relatively small crop plants, there are increased risks for crop damages by soil coverage or other mechanical damages of the crop leaves. These damages are increasing with increasing weed control intensity, and are resulting in reduced crop growth immediately after weed harrowing. There are risks that the reduced growth reduces final crop yield too. However, there is some evidence that there are varietal differences in the tolerance to weed harrowing. The aim of this study was... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Weed management Breeding; Genetics and propagation. |
| Ano: 2005 |
URL: http://orgprints.org/5913/1/5913.pdf |
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| Registros recuperados: 30 | |
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