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
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
Forfattere
Arne StensvandSammendrag
Artikkelen er ein omtale av Signum (aktive stoff: pyraklostrobin og boskalid) og inkluderer resultat frå utprøvingar av preparatet i Noreg.
Forfattere
Arild AndersenSammendrag
Livssyklus hos potetsikade har blitt kartlagt. Det er bare en generasjon i året, og de voksne overvintrer utenfor åkren. Effekten av sikadeangrep av ulik størrelse på potetavlingen ble målt ved å telle opp voksne sikader i juni og nymfer i juli, og sammenholde angrepet med avlingen på høsten. Gjennomsnittlig reduksjon av avlingen var 75 kg/daa per sikadenymfe per blad. Tilsvarende forsøk med teger ble startet opp i 2007.
Forfattere
Arild AndersenSammendrag
Livssyklus hos potetsikade (Empoasca vitis) har blitt kartlagt. Effekten av sikadeangrep av ulik størrelse på potetavlingen ble målt ved å telle opp voksne sikader i juni og nymfer i juli, og sammenholde angrepet med avlingen på høsten. Tilsvarende forsøk med teger ble startet opp i 2007.
Sammendrag
A possible cost-effective real-time patch spraying implementation against seed-propagated broad-leaved weeds in cereals is a camera mounted in front of the tractor taking images at feasible distances in the direction of travel, on-board image analysis software and entire boom switched on and off. To assess this implementation, manual weed counts (0.25 m(2) quadrats) in a 1.5 m x 2 m grid, were used to simulate camera outputs. Each quadrat was classified into 'spray' and 'not spray' decisions based on a threshold model, and the resulting map defined the 'ground truth'. Subsequently, 'on/off' spraying at larger control areas where sizes were given by the boom width and image distance, and spraying decision controlled by weed status at the single quadrat simulating the camera's view, were simulated. These coarser maps were compared with 'ground truth', to estimate mapping error (area above threshold not sprayed), spraying error (area below threshold sprayed), total error (sum of mapping and spraying error) and the herbicide reduction. Three levels of the threshold model were tested. Results were used to fit models that predict errors from boom width and image distance. Size of control area did not on average affect the magnitude of the simulated herbicide reductions, but the bigger the control area the higher the risk that the simulated herbicide reduction deviate from the reduction in 'ground truth'. Mean simulated herbicide reductions were 42-59%, depending on threshold level. Only minor differences due to threshold level were seen for mean mapping and spraying errors at given spraying resolutions. Using original threshold level and image distance 2 m, predicted total errors for boom widths 2 m, 6 m, 20 m and 40 m would be 6%, 10%, 16% and 17%, respectively. Results indicate that control area should not exceed about 10 m 2 if acceptable total error is maximum 10%.
Forfattere
Svein Solberg Dan J. Weydahl Erik NæssetSammendrag
Det er ikke registrert sammendrag
Forfattere
David Bredström Patrik Flisberg Mikael RönnqvistSammendrag
In this paper we discuss some computational experiments on simulating refinery operations. We compare an integrated approach with recursively solving a production planning and sales planning problem. We test two different descriptions of the demand behaviour. The first is based on a fixed lower and upper limit and the second on a demand that varies with the product price. We also test the impact of different number of time periods in the planning horizon. We simulate the behaviour when detailed information of the demand is available.