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
Tor J. JohansenSammendrag
Det er ikke registrert sammendrag
Sammendrag
From 2002 to 2006, the annual dropout rate of certified organic farmers averaged 7.3 %. A project was started in 2007 to explore farmer"s reasons for opting out of certified organic production. Important factors were public regulations including standards for organic farming, agronomy, economy, and farm exit. While many organic farmers with relatively small holdings have opted out, farmers with more land and larger herds tend to convert to organic agriculture. The trend towards larger-scale farms in organic than in conventional agriculture, encouraged by the design of the organic farming payments, challenges the organic principles of diversity and fairness. Means should be considered to ensure that small organic enterprises are also economically viable.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Hallvard JensenSammendrag
Predation has a fundamental role in aquatic ecosystems, but the relative importance of factors governing prey selection by predators remains controversial. In this study, we contrast five lakes of a subarctic watercourse to explore how prey community characteristics affect prey selection and growth of the top predator brown trout. The brown trout was a morph/species- and size-specific pelagic predator, selecting the small-sized, pelagic whitefish morph or vendace over the benthic whitefish morphs. In all lakes, the average prey size increased with predator size, but small-sized prey were also included in the diet of large predators. The selection of small-sized, pelagic prey fish appeared to be a favourable foraging strategy for the brown trout, yielding higher growth rates and an earlier ontogenetic shift to piscivory.
Forfattere
Marcel Van Oijen Stig Morten Thorsen Ad Schapendonk Mats HøglindSammendrag
Conclusion: The process based model for timothy seems to capture the essential dynamics of the grassland model in both summer and winter.
Forfattere
jihong liu clarkeSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Reidun PommerescheSammendrag
Andelslandbruk er direkte omsetning og dialog mellom gårdbrukere og forbrukere. Opplegget er at forbrukere kjøper andeler av gårdens produksjon, for en avgrenset periode om gangen, og får så ut sin andel av grønnsaker, frukt og bær utover i sesongen. Det er nå etablert tre andelsgårder i Norge.
Forfattere
Peder GjerdrumSammendrag
Cost and revenue related to kiln drying are described. A calculation model compatible with a sawmill\"s profit and loss account is suggested. Typical cost items for a Scandinavian sawmill and from European litterature are reported. Cost for shrinkage/distortion/quality losses and investment/depriciation and maintenance for kilns and other technical equipment. It is claimed that better models and intensified calculation will improve sawmill profitability.