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.
2008
Forfattere
Erik ChristiansenSammendrag
Among thousands of bark beetle species worldwide, only a handful is able to attack and kill trees on a large scale. One of these is the 8-toothed spruce bark beetle, Ips typographus L., indigenous to the Palaearctic forests and recently introduced into North America. In Europe, the main host is the Norway spruce, Picea abies (Linnaeus) Karsten; in Eastern Asia, including Japan, the main hosts are spruces of the P. jezoensis group. In unmanaged forests, these beetles play an important ecological role by killing old trees and stands, thus promoting biomass recycling and ecosystem rejuvenation. Foresters who are faced with extensive tree mortality do not, however, welcome this activity: managed forests of Europe have lost hundreds of millions of trees in recurring outbreaks
Forfattere
Inger Sundheim FløistadSammendrag
CABI gjennomfører i 2008 en web-basert spørreundersøkelse om invaderende fremmede plantearter
Forfattere
Eva SkarbøvikSammendrag
Det er ikke registrert sammendrag
Forfattere
Eva SkarbøvikSammendrag
Det er ikke registrert sammendrag
Forfattere
David Barton Marianne Bechmann Hans Olav Eggestad J. Moe Toumi Saloranta S. Kuikka Phil HaygarthSammendrag
Det er ikke registrert sammendrag
Sammendrag
Este proyecto de validación de sistemas ganaderos sostenibles en mérica Central usando metodologías participativas ha mejorado el entendimiento de ese tipo de sistemas entre los pequeños productores ganaderos y extensionistas. Sin embargo la falta de esos servicios públicos dificultó el desarrollo del proyecto, el cual respondió lentamente en encontrar vías alternativas.
Forfattere
Espen GovasmarkSammendrag
Det er ikke registrert sammendrag
Forfattere
Bjørn Molteberg Trygve S. Aamlid Frank Enger Anne A. Steensohn Åge SusortSammendrag
From 2003 to 2006, three varieties of velvet bentgrass (Agrostis canina), thirteen varieties of creeping bentgrass, nine varieties of colonial bentgrass (Agrostis capillaris), four varieties of slender creeping red fescue Festuca rubra var. trichophylla): thirteen varieties of chewings fescue (Festuca rubra var. commutata), and one variety of annual bluegrass (Poa annua var. reptans) were evaluated for establishment rate, overall turf quality (visual merit), tiller density, color, leaf fineness, per cent living plant cover, winter injury, disease resistance, spring green-up, daily height growth, and thatch accumulation in trials on USGA-spec. putting greens at the Bioforsk research stations Landvik (58°N, 12 m a.s.l.) and Apelsvoll (61°N, 250 m a.s.l.) in south-east Norway. These experimental sites are considered representative for the southern/coastal and the northern/ continental zone of Scandinavia, respectively. The trials were mowed three times per week to 3 mm for bentgrass species and annual bluegrass and to 4-5-5.0 mm for red fescues; fertilized with easily soluble, small-grain mineral fertilizer every second week, and otherwise managed as putting greens with respect to irrigation, vertical mowing, aeration and topdressing. The greens were not open to regular play, but articifial wear was imposed by rolling friction-drums with golf-spikes over the trials three timers per week. On average for varieties within each species, velvet bentgrass had the highest visual merit scores at both experimental sites. Velvet bentgrass had higher density and finer leaves than any other species in the study. Along with colonial bentgrass, it also had better winter survival than creeping bentgrass, red fescue and annual bluegrass. The main disadvantage of velvet bentgrass is its rapid formation of thatch; this problem must be resolved before a general recommendation for use of velvet bentgrass on Scandinavian putting greens can be given. Next to velvet bentgrass, colonial bentgrass and creeping bentgrass were ranked as the most suitable species for golf courses in the northern/continental and southern/coastal zone, respectively. Red fescues should be preferred on golf courses not using fungicides and with limited maintenance budgets. While annual bluegrass `True Putt" cannot be recommended for putting greens in any part of Scandinavia, the ranking of varieties within each species depended, for the most part, on climatic zone. Based on overall performance in this project, a list of recommended varieties are presented for the Scandinavian putting greens.
Sammendrag
Lack of automatic weed detection tools has hampered the adoption of site-specific weed control in cereals. An initial object-oriented algorithm for the automatic detection of broad-leaved weeds in cereals developed by SINTEF ICT (Oslo, Norway) was evaluated. The algorithm ("WeedFinder") estimates total density and cover of broad-leaved weed seedlings in cereal fields from near-ground red-green-blue images. The ability of "WeedFinder" to predict 'spray'/'no spray' decisions according to a previously suggested spray decision model for spring cereals was tested with images from two wheat fields sown with the normal row spacing of the region, 0.125 m. Applying the decision model as a simple look-up table, "WeedFinder" gave correct spray decisions in 65-85% of the test images. With discriminant analysis, corresponding mean rates were 84-90%. Future versions of "WeedFinder" must be more accurate and accommodate weed species recognition.
Forfattere
Trygve S. Aamlid Oiva Niemelainen Maire Rannikko Terje Haugen Sanni Junnila Tatsiana Espevig Åge SusortSammendrag
This report presents first year results from a two year project evaluating the plant growth regulator Primo MAXX® (trineexapac-ethyl) on Nordic golf courses.