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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 815
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Zur Bedeutung einer stark gegliederten Feldflur für die Entwicklung von Ackerwildkraut-Gesellschaften. Beispiele aus Thüringen und Nordhessen. Organic Eprints
van Elsen, Thomas; Scheller, Ute.
Die regionale Gliederung der Feldflur unterscheidet sich je nach Nutzungsgeschichte der Agrarlandschaft erheblich. Die Bedeutung einer stark gegliederten Feldflur für artenreiche Ackerwildkraut-Gesekkschaften wird anhand floristischer und vegetationskundlicher Untersuchungen in zwei benachbarten Gebieten beiderseits der hessisch-thüringischen Grenze dargestellt. Teile des nordhessischen Werra-Meißner-Kreises sind noch heute durch eine infolge Realteilungs-Erbrechts zersplitterte Feldflur und das Vorherrschen von Nebenerwerbs-Landwirtschaft geprägt, während im thüringischen Obereichsfeld die großflächige Bewirtschaftung durch LPG-Nachfolgeorganisationen dominiert. Die erfolgte Ausräumung der Agrarlandschaft und der damit verbundene Verlust an...
Tipo: Journal paper Palavras-chave: Weed management; Biodiversity and ecosystem services.
Ano: 1994 URL: http://orgprints.org/4801/1/vE_Scheller_1994.pdf
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Weed harrowing in seeded onions Organic Eprints
Melander, Senior scientist Bo; Hartvig, Technician Peter.
Different aspects of using weed harrowing for weed control in organic onions are presented and discussed.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 1995 URL: http://orgprints.org/1764/1/Weed_Harrowing.pdf
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Yield responses of weed-free seeded onions [Allium cepa (L.)] to hoeing close to the row Organic Eprints
Melander, Senior scientist Bo; Hartvig, Technicians Peter.
The paper contains results from field experiments looking at the possibilities for hoeing very close to the crop row in seeded onions.
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 1997 URL: http://orgprints.org/1763/1/Yield_responses.pdf
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Optimization of the adjustment of vetical axis rotary brush weeder for intra row weed control in row crops Organic Eprints
Melander, Senior scientist Bo.
Vertical axis rotary brush weeding is an option for mechanical intra-row weed control in organic row crops. The paper contains information about appropriate adjustment and operation of the brush weeder in direct-sown onion.
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 1997 URL: http://orgprints.org/1762/1/Optimization_of.pdf
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Weed control with inter-row hoeing in cereals Organic Eprints
Lötjönen, Timo; Mikkola, Hannu.
Our tasks is to study in Finnish conditions, how to build a cheap hoe suitable for cereals, which are the benefits of inter-row hoeing and to find out the capacity of this method.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 1997 URL: http://orgprints.org/11272/1/njf.pdf
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Regulering af ukrudt Organic Eprints
Rasmussen, Ilse A.; Melander, Bo; Rasmussen, Karsten; Rasmussen, Jesper.
I økologisk plantedyrkning er ukrudtsreguleringen baseret på et samspil mellem forebyggelse og bekæmpelse, hvor forebyggelse spiller en langt større rolle end i den konventionelle dyrk-ning. I korn og andre tætsåede afgrøder er forebyggelsen den væsentligste komponent i ukrudtsreguleringen, hvorimod det er den direkte bekæmpelse, der udgør grundlaget for dyrk-ning af rækkeafgrøder så som gulerødder, løg, roer og kartofler. Den økologiske ukrudtsregu-lering kendetegnes ved kompleksitet, da der dels anvendes mange forskellige metoder, og dels anvendes metoder med langsigtede effekter i dyrkningssystemet. Formålet med denne artikel er at give overblik over de anvendte metoder. Artiklen er opbygget således at der først er et afsnit om behovet for...
Tipo: Report chapter Palavras-chave: Weed management.
Ano: 1997 URL: http://orgprints.org/254/1/5.PDF
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Ikke så mens du høster Organic Eprints
Koesling, Matthias.
Dagens treskere har nådd et høyt teknisk nivå når det gjelder for eksempel renhet av korn i tanken, lite tresketap og vedlikeholdsbehov. Likevel må treskere ta en del av skylden for at det fortsatt vokser en god del frøugras i kornåkrene.
Tipo: Journal paper Palavras-chave: Weed management; Buildings and machinery.
Ano: 1997 URL: http://orgprints.org/6549/1/MKoesling__Ikke__saa__mens_du_hoester.pdf
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Economic Aspects of Physical Intra-Row Weed Control in Seeded Onions Organic Eprints
Melander, Senior scientist Bo.
The paper presents a model to calculate the costs for weed control in organic row crops. The model makes it possible to analyse the economic consequences of different weed control strategies in row crops. Particularly the time needed for hand-weeding had a strong impact on the costs.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 1998 URL: http://orgprints.org/1510/1/IFOAM_98_NYVERSION1.pdf
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Desk study on the control of weeds in organic arable and horticultural production systems OF0152 Organic Eprints
Anon,.
The Ministry is seeking to encourage an expansion of organic farming with a research programme to provide information of benefit to organic farmers and to policy makers. The lack of a reliable and effective weed control system that does not rely on herbicides, has been highlighted as the major problem in limiting the growth of organic farming in the UK. Studies have been made that are aimed specifically at developing organic weed control techniques. There has also been work on non-chemical methods for dealing with weeds in conventional systems. Research in weed biology, population dynamics, and competition modelling from conventional systems also provide valuable information for improving weed control strategies. In addition, research into novel and...
Tipo: Report Palavras-chave: Weed management.
Ano: 1998 URL: http://orgprints.org/10110/2/weeds_in_organic_arable_and_horticulture_OF0152.pdf
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Anvendelse af falsk såbed, blindharvning og flammebehandling i højværdiafgrøder Organic Eprints
Melander, Senior scientist Bo.
På baggrund af nærværende undersøgelse med såløg har det ikke været muligt at påvise væsentlige forskelle mellem blindharvning og flammebehandling anvendt 1-2 dage før løgenes fremspiring. Da blindharvning er en betydelig billigere og mere miljøvenlig metode end flammebehandling, vil det være relevant yderligere at undersøge mulighederne for at anvende blindharvning i højværdiafgrøder. Undersøgelserne viste også, at tidspunktet for blindharvning godt kan foregå 4-6 dage før fremspiring frem for 1-2 dage før, uden at effekterne mod ukrudt derved svækkes væsentligt. Tidligere blindharvning kan være ønskeligt i øverligt såede kulturer som såløg og -porre for at mindske risikoen for at skade kulturfrøenes kimstængler. Falsk såbed anvendt i såløg havde...
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 1998 URL: http://orgprints.org/1616/1/PLANTV11.pdf
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Tidsler - en gave fra himlen Organic Eprints
Borgen, Anders.
Tidsler og andet udkrudt er ikke kun en irriterende udbyttebegrænsende faktor, men også en indikator.
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 1998 URL: http://orgprints.org/34198/1/tidsler.html
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Bekämpfungserfolg bei mechanischer Unkrautregulation Organic Eprints
Laber, Hermann; Stützel, Hartmut.
Zwar sind Hacken und Striegeln altherbrachte Verfahren; doch wie hoch ist ihr Bekämpfungserfolg in der Praxis und wie läßt er sich, insbesondere im Reihenbereich, steigern? Mit welchen Nebenwirkungen auf die Kulturen ist zu rechnen? Die Untersuchungen gliederten sich in zweijährige Erhebungsuntersuchungen auf ökologisch bewirtschafteten Möhren- und Zwiebelschlägen in Praxisbetrieben nördlich von Hannover sowie Versuche auf den Flächen des Instituts für Gemüse- und Obstbau der Universität Hannover. Insgesamt konnten in den beiden Versuchsjahren 1995 und 1996 Daten von 5 Möhren- und 5 Zwiebelschlägen in landwirtschaftlichen Fruchtfolgen dreier Praxisbetriebe erfaßt werden. Bei den Betriebsleitern, die alle Hackmaßnahmen selbst durchführten, handelte es...
Tipo: Journal paper Palavras-chave: Vegetables; Weed management.
Ano: 1998 URL: http://orgprints.org/1192/1/1192%2Dlaber%2Dh%2Det%2Dal%2D1998%2Dbekaempfungserfolg.pdf
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Einflussfaktoren auf den Bekämpfungserfolg beim Hacken Organic Eprints
Laber, Hermann; Stützel, Hartmut.
Erhebungen in Praxisbetrieben und Feldversuche haben bei den gleichen Kulturen - Möhren und Zwiebeln - enorme Unterschiede im Bekämpfungserfolg durch Hacken gezeigt (Gemüse Nr. 10/98 - siehe www.orgprints.org/00001192). So konnten in einigen Fällen im Zwischenreihenbereich Bekämpfungserfolge von 100% und selbst im Reihenbereich von nahezu 80% gefunden werden, wo hingegen in anderen Fällen deutlich schlechtere Ergebnisse erzielt wurden. Die Ergebnisse der Modell- und Feldversuche verdeutlichen, daß für einen befriedigenden Bekämpfungserfolg beim Hacken vier Punkte beachtet werden müssen: - Der Boden sollte trocken, höchstens leicht feucht sein. - mindestens ein Tag nach dem Hacken sollte sonniges, trockenes Wetter herrschen. Jeder Millimeter mehr...
Tipo: Journal paper Palavras-chave: Vegetables; Weed management.
Ano: 1998 URL: http://orgprints.org/1195/1/1195%2Dlaber%2Dh%2Det%2Dal%2D1998%2Deinflussfaktoren.pdf
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Laboratory assessment of crop tolerance to selective flaming Organic Eprints
Vanhala, Petri; Rahkonen, Jukka.
We developed a laboratory method which enables researchers of thermal weed control to assess crop tolerance to selective flaming. We have tested cabbage and red beet tolerance to flaming with this method.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 1998 URL: http://orgprints.org/11240/1/Wye.pdf
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Interactions between soil cultivation in darkness, flaming, and brush weeding when used for in-row weed control in vegetables Organic Eprints
Melander, Senior scientist Bo.
Interactions between soil cultivation in darkness, flaming and brush weeding on in-row weeds in vegetables were studied in two field experiments.
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 1998 URL: http://orgprints.org/1663/1/Interactions_between.pdf
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PERCEPTIONS OF LEAFY SPURGE BY PUBLIC LAND MANAGERS, LOCAL DECISION MAKERS, AND RANCH OPERATORS; SUMMARY AgEcon
Sell, Randall S.; Bangsund, Dean A.; Leistritz, F. Larry; Nudell, Daniel J..
A survey of 459 ranchers, 56 local decision makers, and 50 public land managers (565 total) was conducted to evaluate managerial, institutional, and social factors that may affect the rate and extent of implementation of various leafy spurge (Euphorbia esula L.) controls. The study focused on a five-county region in Montana, North Dakota, South Dakota, and Wyoming. The questionnaire focused on weed management in general and specifically on the perceptions and attitudes of ranchers, land managers, and local decision makers who have been directly and indirectly affected by leafy spurge.
Tipo: Working or Discussion Paper Palavras-chave: Leafy spurge; Weed management; Rancher opinion; Public land manager opinions.; Farm Management; Resource /Energy Economics and Policy.
Ano: 1998 URL: http://purl.umn.edu/23236
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PERCEPTIONS OF LEAFY SPURGE BY PUBLIC LAND MANAGERS, LOCAL DECISION MAKERS, AND RANCH OPERATORS AgEcon
Sell, Randall S.; Bangsund, Dean A.; Leistritz, F. Larry; Nudell, Daniel J..
A survey of 459 ranchers, 56 local decision makers, and 50 public land managers (565 total) was conducted to evaluate managerial, institutional, and social factors that may affect the rate and extent of implementation of various leafy spurge (Euphorbia esula L.) controls. The study focused on a five-county region in Montana, North Dakota, South Dakota, and Wyoming. The questionnaire focused on weed management in general and specifically on the perceptions and attitudes of ranchers, land managers, and local decision makers who have been directly and indirectly affected by leafy spurge.
Tipo: Working or Discussion Paper Palavras-chave: Leafy spurge; Weed management; Rancher opinion; Public land manager opinions.; Farm Management; Resource /Energy Economics and Policy.
Ano: 1998 URL: http://purl.umn.edu/23399
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Determination of the critical period of weed control in corn using a thermal basis. Repositório Alice
BEDMAR, F.; MANETTI, P.; MONTERUBBIANESI, G..
Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period fo weed control in maize (Zea mays L.). The treatment consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed removal ranged from 222 to 416 and 128 to 261 accumulated thermal units respectively, to prevent yield losses of 2.5%. Weed biomass proved to be inverse t the crop yield...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Weed interference; Weed management; Accumulated thermal units; Nonlinear regression; Interferencia de plantas daninhas; Manejo de plantas daninhas; Unidades termicas acumuladas; Regressao nao-linear.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/88836
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Abflammen von Säzwiebeln im Nachauflauf Organic Eprints
Laber, H.; Baumgarten, B.; Stützel, H.; Wonneberger, C..
Einleitung: Für den ökologischen Anbau von Säzwiebeln ist das Abflammen ein wesentliches Glied in der Kette der Maßnahmen zur Unkrautregulation, ohne das ein großflächiger Anbau nicht denkbar wäre. Anders als bei der Möhre und anderen Arten, bei denen das Abflammen vor Auflauf der Kultur durchzuführen ist, sind bei Zwiebeln auch Behandlungen im Nachauflauf möglich. In der Praxis taucht aber immer wieder die Frage auf, bis zu welchem Entwicklungsstadium das Abflammen erfolgen kann, ohne die Pflanzen nachhaltig zu schädigen. Im Rahmen einer Diplomarbeit (LABER 1990) wurden die Auswirkungen unterschiedlicher Abflammtermine bei Säzwiebeln näher untersucht. Fazit: - Abflammbehandlungen im Nachauflauf der Zwiebeln reduzieren den Aufwand beim ersten...
Tipo: Journal paper Palavras-chave: Vegetables; Weed management.
Ano: 1999 URL: http://orgprints.org/1218/1/1218%2Dlaber%2Dh%2Det%2Dal%2D1999%2Dsaezwiebeln.pdf
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Cultural methods for controlling docks in organically farmed grassland (extension 1998-99) (OFT0115T) Organic Eprints
Hopkins, Mr Alan.
Docks are considered to be one of the main weed problems of grassland. The absence of an effective non-chemical control may be a deterrent to organic-conversion for farmers accustomed to using herbicides for dock control. This work addresses this problem in the context of MAFF policy to encourage more farmers to adopt organic farming, and to encourage a reduction in the use of herbicides in farming generally. The project was based around hypotheses that physical techniques and management strategies can affect the relative competitiveness of docks within the grass-based sward, and that by exploiting this relative competitiveness the problem can be reduced or contained within acceptable limits. During the initial phase of the project (01/05/95 to...
Tipo: Report Palavras-chave: Weed management.
Ano: 1999 URL: http://orgprints.org/9927/1/Cultural_methods_for_controlling_docks_in_organically_farmed_grassland_OF0115T.pdf
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