Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2007
Sammendrag
Identification of up-regulated genes during zearalenone biosynthesis in strains of Fusarium.
Sammendrag
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Sammendrag
We evaluated direct and interactive effects of light quality and intensity, temperature and light, diurnal rhythms, and timing of high relative humidity during long day lengths on sporulation of Bremia lactucae, the causal agent of lettuce downy mildew, using inoculated lettuce seedlings and detached cotyledons. Suppression of sporulation by light was strongly dependent upon temperature and there was little suppression at "10°C. The most suppressive waveband was in the range from 400 to 450 nm, although a lesser effect of wavebands from 450 to 500 and 500 to 550 nm could be detected. At 15°C, near the lower threshold for suppression of sporulation by light, a clear diurnal pattern of sporulation was observed independent of light and darkness. This diurnal rhythm potentially could interact with light and temperature to confound the results of controlled environment studies, and may be the controlling factor in timing of sporulation at low temperatures. Forecasting models that currently use sunrise and sunset to delimit periods conducive to sporulation can be adapted to short nights and extended twilight conditions by incorporating the effects reported herein. Additionally, models of sporulation could be adapted to better reflect a decrease or absence of the suppressive effect of light at
Forfattere
Lene Frost Andersen Trine Husøy Svein Olav Kolset Henrik Jakobsen Jan Alexander Mona-Lise Binderup Knut Helkås Dahl Erik Dybing Wenche Kristin Farstad Livar Frøyland Ragnhild Halvorsen Margaretha Haugen Kåre Julshamn Georg Kapperud Hilde Kruse Øyvind Lie Anne-Katrine Lundebye Helle Margrete Meltzer Judith Ann Narvhus Kristine Naterstad Ingolf Nes Bjørn Næss Jan Erik Paulsen Tore Sanner Janneche Utne Skåre Inger-Lise Steffensen Leif Sundheim Åshild KrogdahlSammendrag
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Forfattere
Eva SkarbøvikSammendrag
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Forfattere
Erlend Nybakk Eric N. HansenSammendrag
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Forfattere
Kristoffer Segerholm Roger Rowell Pia Larsson-Brelid Magnus Wålinder Mats Westin Gry AlfredsenSammendrag
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Sammendrag
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Forfattere
Kjell Mangerud Lars Olav BrandsæterSammendrag
Our objective in an ongoing study is to improving weed harrowing in organic cereal production as well as implementing weed harrowing as an alternative for herbicides in conventional farming. The study includes experiments on three locations during three years. The experiments have included different types of spring tine weed harrows used with different aggressiveness (by differing tine working depths and speeds), cereal developmental stages, soil types (locations) and conditions as well as competition levels (natural variation in severity of weed infestation during three years on three locations). Cereal yield and quality, number and dry matter weight (biomass) of weed and soil water content, soil share strength and soil penetration resistance are recorded. Pre-emergence harrowing, or harrowing at early 1-leaf stage reduced in general weed number and biomass compared to untreated control. The mean weed reduction over locations and years was about 40%, but this reduction was not always significant different to control plots. In general pre-emergence harrowing or at early 1-leaf stage increased the yield compared to untreated, but harrowing at that stage has also under certain circumstances given small yield reductions as well. The combination of pre-emergence harrowing and harrowing at 3-4 leaf stage gave a significant reduction of weed number and biomass compared to untreated control. In general, harrowing twice gave increased cereal yield, but the differences were only significant at one of the locations. The potential benefit of a second harrowing at the 3-4 leaf stage depends on the weed situation, number and biomass, as well as the compatibility of the cereal. Furthermore, our results indicate that the different types of harrows and tines will not do a proper job on all soil types. On light soils all of them have given satisfying results. A normal tine (7 mm bent Einböck or a 10 mm long straight CMN) is not rigid enough on soil types that build a crust after rain. An 8 mm bend Einböck tine, however, broke down the crust and gave increased cereal emergence on such soils. On the other hand it is important not to adjust this tine to aggressive when there is no crust. Other trial show that in stony soils a straight tine will pick up less stones compared with a bent one, stones witch can damage the combine harvester. Our result from one of the location (medium light soil with stones) indicate no difference in yield, reductions in weed number or biomass pr m² with a straight tine compared width a bent one.
Forfattere
Christian UhligSammendrag
The concept of native plant material is increasingly acknowledged and practically applied all over Europe. The main objective of this paper is to suggest the use of organic material from early succession plant species as conceptual material for revegetation efforts in general, and as alternative materials for the production of erosion control mats in particular.