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| Registros recuperados: 10 | |
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| Vanhala, Petri; Lötjönen, Timo. |
| Fleråriga rotogräs har ökat i mängd både i konventionell och ekologisk odling i Finland. I synnerhet har åkermolke (Sonchus arvensis) och åkertistel (Cirsium arvense), som båda tål jordbearbetning, förökats. Eftersom de vanligtvis växer från rotutlöpare, har ögräsharvning bara liten effekt på rotogräs. Det behövs antingen kraftigare mekaniska åtgärder eller utnyttjande av grödans konkurrenskraft och andra odlingstekniska metoder. |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2004 |
URL: http://orgprints.org/5794/1/fnytt404.pdf |
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| Vanhala, Petri; Lötjönen, Timo; Hurme, Timo; Salonen, Jukka. |
| Perennial sow-thistle (Sonchus arvensis L.) represents an increasing problem in Finland. Options for mechanical and cultural control of S. arvensis were studied in a field experiment on clay soil under organic production. The experiment consisted of different crop sequences: spring cereal (barley, Hordeum vulgare L., in 2001, oats, Avena sativa L., in 2002) with or without inter-row hoeing and/or stubble cultivation, bare fallow, fibre hemp (Cannabis sativa L.), and ley with mowing. In 2003 the entire field was sown to spring wheat. Crop plant and Sonchus shoot density and dry mass prior to cereal harvest and crop yield were assessed. The control effect was rated: bare fallow > ley > cereal with or without inter-row hoeing > poor growth fibre... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2006 |
URL: http://orgprints.org/16758/1/vanhala2.pdf |
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| Fogelfors, Håkan; Brandsætter, Lars Olav; Graglia, Scientist Enrico; Vanhala, Petri; Salonen, Jukka; Håkansson, Sigurd. |
| In a joint experiment between Norway, Denmark, Finland and Sweden the dormancy of vegetative reproduction in Cirsium arvense, Sonchus arvensis and Elymus repens was studied during the latter part of the vegetation period.The aim of the study was to achieve a more efficient control of these weed species by knowing their reproduction behaviour in the autumn. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Research methodology and philosophy; Weed management. |
| Ano: 2003 |
URL: http://orgprints.org/1730/1/Dormancy.pdf |
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| Vanhala, Petri; Pietola, Liisa. |
| Amendment of soil with peat is an attempt to avoid crop yield variation in the transition to conservation tillage, as it improves seedbed conditions and crop growth in drought-sensitive clay soils. Weed infestations were compared in 1999-2000 between the original and peat-amended clay (Typic Cryaquept, very fine, illitic or mixed) under different autumn tillage systems in an oats-barley rotation. In a field experiment, sphagnum peat (H = 4) had been spread (0.02 m 3 m -2 ) on the soil surface in August 1995. Tillage treatments included mouldboard ploughing (to 20 cm) and stubble cultivations of different working depths (8 or 15 cm) and intensity (once or twice). Weed biomass and density were assessed by an area of 1 m 2 per field plot in August 1999-2000... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2003 |
URL: http://orgprints.org/16752/1/vanhala.pdf |
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| Vanhala, Petri; Lötjönen, Timo; Salonen, Jukka. |
| In order to study the biology and non-chemical control of perennial weeds, a three-year field experiment was established in 2001 at Vihti, southern Finland. The experiment was placed in a clay soil field under organic production, infested moderately with Cirsium arvense, Elymus repens and Stachys palustris, and heavily with Sonchus arvensis. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2003 |
URL: http://orgprints.org/11140/1/NJF1.pdf |
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| Registros recuperados: 10 | |
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