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.
2005
Forfattere
Birger VenneslandSammendrag
During the 1980s Norway was troubled with overcapacity in the agricultural sector. The rural development support scheme (RDSS) was introduced. Farmers were encouraged to invest in forestry-related projects and rural business. More than 15 evaluations of the RDSS are undertaken, all of them having severe methodological weakness. The following study introduces a new tool, when analyzing a public support scheme like the RDSS in Norway. Data envelopment analysis (DEA) is a multi-input, multi-output optimization model used to measure relative efficiency of the best practice counties. The analysis is a two-stage study. In step one, it is found that 13 of the 18 (72%) counties in Norway are generating less output in the form of employment from a given level of the RDSS-budget than technically possible. In step two, a reallocation of the budget is shown for the purpose of maximizing the output of job establishments in rural Norway. The DEA is seen as a useful tool in measuring the efficiency of the RDSS at regional level in Norway.
Forfattere
Pommeresche, Reidun Reidun PommerescheSammendrag
Det er ikke registrert sammendrag
Forfattere
Ola Wågbø Oddmund HjukseSammendrag
Det er ikke registrert sammendrag
Forfattere
Astrid Johansen Anna HaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Tore SkrøppaSammendrag
Det er ikke registrert sammendrag
Forfattere
Bernt-Håvard ØyenSammendrag
Det er ikke registrert sammendrag
Forfattere
Gunhild Børtnes Ruth MordalSammendrag
Åtte navnesortar og tre frøparti av merian vart prøvde ut ved Planteforsk Kise og ein del andre stader i åra 1999 til 2004. Merian må dyrkast som eittårig plante i Norge. Unge stilkar og blad, både friske og tørka, blir brukt som krydder i kjøtt og fiskerettar. Merian er også mykje brukt i pizza, tomat, egg- og osterettar.
Forfattere
Astrid Oberson Erik JonerSammendrag
Microbial uptake and immobilization of P, and its subsequent release and redistribution, play central roles in the biogeochemical cycling of P in soil. Soil microorganisms constitute a pool of mostly labile organic P compounds that are rapidly hydrolysed once the cells are disrupted. The size of this pool mainly depends on soil type, land use and the related content of soil organic matter and can, therefore, in agricultural soils be affected through organic matter management. The quantities of microbial P extractable after fumigation-extraction reported for mineral topsoils across different ecosystems and litter layers encompass a range from 1 to around 200 mg P kg-1, or between 0.5 and 26% of the total P content in the corresponding soils. Because fumigation does not release all microbial P, the total amount of microbial P can be up to several times higher. Current estimates are precise enough to detect changes in the microbial P pool as a result of changes in land use, agricultural practices or environmental factors. Refined methods are still needed to quantify P fluxes through the soil microbial biomass and to describe mechanisms and ecological interactions between microorganisms and their substrates at the physiological, biochemical and molecular level. In soils with small P contents, microbial activity does not suffer from P limitation to the same extent as plants, as soil microorganisms have highly efficient mechanisms to acquire P. Progress has been made in our understanding and quantification of organic P mineralization, and the factors determining microbial immobilization and re-mineralization sequences are better understood. Studies of P turnover using radioisotopes have revealed a highly dynamic nature of the microbial P pool even in the absence of changes in microbial P. Here, we will review recent advances in radiotracer studies of P turnover and emphasize the importance of trophic interactions, microenvironments and aspects of specific microbial life-cycles that have a major impact on turnover rates and subsequent release of microbial P in soil.
Forfattere
Hege StubberudSammendrag
Det er ikke registrert sammendrag
Forfattere
Serikstad, Grete LeneSammendrag
Det er ikke registrert sammendrag