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
Espen Govasmark Trine Aulstad SognSammendrag
Innhold av selen (Se) i grovfôr og matkorn i Norge er lavt vurdert i forhold til gjeldende normer for daglig behov til henholdsvis melkeku og sau, og til mennesker. Det finnes i dag ingen kjente akseptable gjødselkilder for Se i økologisk landbruk som øker innholdet av Se i grovfôr og/eller matkorn.
Forfattere
Espen GovasmarkSammendrag
Det er ikke registrert sammendrag
Forfattere
Espen Govasmark Bal Ram Singh John A. MacLeod Mark G GrimmettSammendrag
Selenium (Se) deficiency in Scandinavian soils is a common problem, and crops generally contain inadequate amounts to meet human need. This study shows a relationship of the Se concentration in spring wheat (Triticum aestivum L., c.v. 'Helena') and leaching water with timing of nitrogen (N) [as ammonium nitrate (NH4NO3)] and Se [as sodium selenate (Na2SeO4)] application. Ammonium-nitrate was applied by two methods (i) whole amount at sowing and (ii) in split application as 75% at sowing and 25% at stem elongation. Selenate was applied at cereal growth stages after sowing, e.g., tillering, stem elongation, head emergence, and milking. Split N application in comparison to one N application increased the grain protein content from 12.1 to 13.7 mg g(-1), and grain Se was increased from 0.8 to 1.1 mg kg(-1) when Se was applied at stem elongation and from 0.6 to 0.9 mg kg(-1) when applied at heading. The highest Se concentration in plant was achieved with the split N application and Se application at stem elongation or heading. Selenium leaching losses increased with increasing selenium concentration in the wheat grains. No differences in Se leaching losses were obtained with split N application. Applying selenate and ammonium-nitrate together after tillering increased the grain Se concentration, but did not affect the potential leaching of Se, and thus could be considered as an appropriate time of application of these elements.
Forfattere
Espen GovasmarkSammendrag
Det er ikke registrert sammendrag
Forfattere
Espen GovasmarkSammendrag
Det er ikke registrert sammendrag
Forfattere
Peder GjerdrumSammendrag
Pine (Pinus sylvestris) heartwood and pine sapwood can, in several respects, be considered two different timber products. Sapwood demonstrates open structures that easily adsorb moisture and is vulnerable to bio-chemical disintegration, but also more easily painted, glued or impregnated. Heartwood, on the other hand, is less disposed to moisture fluctuations, hence, more dimensionally stable, and durable. Heartwood content is closely related to cambial age and to the progress of annual ring width. It is also the nature of pine is to grow timber of quite varying quality along the stem. Resins are more abundant near the base, and the knottiness is shifting, following certain patterns from the base upwards. Several of those traits can be identified prior to breakdown, applying specific wood technology knowledge, recent research and standard log scanner equipment. Even with this potential for producing more homogeneous board quality by including heartwood in the breakdown decision basis, one should not forget the practical implications for the sawmill. The cost of keeping separate heartwood quality classes and the risk of mistakes might easily exceed the price gain.
Forfattere
Jan Stenlid Matteo Garbelotto Ursula Kües James B. Anderson Francis Martin Halvor SolheimSammendrag
Det er ikke registrert sammendrag
Forfattere
Jan Stenlid Åke Olson Kerstin Dalman Magnus Karlsson Mikael Brandström Karl Lundén Carl Gunnar Fossdal Matteo Garbelotto Frederick AsiegbuSammendrag
Heterobasidion annosum s.l. causes a devastating root rot in conifer plantations and natural forests throughout the northern hemisphere. The genome sequencing of H. annosum will provide the first comprehensive genetic information on a plant pathogenic homobasidiomycete allowing for new insights into plant-microbe interactions with trees, in particular conifers. It is important to broaden the taxonomic base for understanding the mechanisms of plant-microbe interactions, studying genes and proteins involved, and identifying pathogenicity determinants. Comparative genomics of plant pathogens with a gradient of taxonomic relatedness to H. annosum will help to understand the evolution of such factors. The project involves resequencing of several species in the H. annosum species complex including pathogenic and non-pathogenic species. Comparisons can also be made with fungi with different nutritional relations to plants; necrotrophic, biotrophic and mycorrhizal mutualist. The project integrates genetic approaches e.g QTL mapping with comparative genomics. Data bases generated on genes under positive selection in the sequenced genomes will be compared with candidate genes derived from published QTL mapping and EST-projects but also known pathogenicity factors in other pathosystems.
Forfattere
Åge Arild NyborgSammendrag
Det er ikke registrert sammendrag
Forfattere
Gunnar Austrheim Leif-Jarle Asheim Gunnar Bjarnason Jon Feilberg Anna Maria Fosaa Øystein Holand Kenneth Høegh Ingibjörg S. Jónsdóttir Borgthor Magnusson Lis E. Mortensen Atle Mysterud Erla Olsen Anders Skonhoft Geir Steinheim Gudrun ThórhallsdóttirSammendrag
Det er ikke registrert sammendrag