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
Knut Anders HovstadSammendrag
Landscape and population dynamics in Taraxacum officinale
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Bernt-Håvard Øyen Vegard GundersenSammendrag
Skogreisingen som ideologisk ”folkebevegelse” etter andre verdenskrig hadde sin bærende ide vesentlig knyttet til ressursoppbygging for å styrke næringsgrunnlaget for gardsbrukene, lokalsamfunn og den trebaserte industrien. De landskapsmessige, visuelle sidene ved skogreisingen ble i de første tiårene tillagt liten eller ingen vekt. Fremover ser vi det som viktig å øke forståelsen for konsekvensene av de tiltak som settes inn, også på det visuelle plan. Kompetanse i forhold til landskapsdesign bør sterkere inn i forvaltning og hos entreprenører og skogeiere. Forskningsbehovene på feltet er diskutert med dette som bakteppe.
Forfattere
Bjørn FrantzenSammendrag
Artikkelen er basert på forfatterens egne erfaringer gjennom 20 års arbeid i Russland
Forfattere
Helge SjursenSammendrag
Landøyda tilhører den biologiske gruppen flerårige, stedbundne med rotstokk. Stengelen er opprett og sterkt greinet ovenfor midten, grov, stiv og furete med brun-rød fargetone. Bladene ved basis er stilkete og finnet med fjærdelte småblad som er utvidet mot spissen. De øvre bladene er sittende, finnet med taggete småblad. Planten har smørgule blomsterkorger i flate halvskjermer. Forekommer i natureng, beitemark og tørrbakke, langs skogkanter, veier og grøfter. Liker best sur, lettere sand-, grus- og moldjord. Opptrer som ugras i eng og beite. Vanlig i kyst- og fjordstrøk til Sogn og Fjordane. Planten er giftig for storfe og hest, men vrakes vanligvis av husdyrene. Bekjempelse: Bør hogges av før frøsetting. Kan også bekjempes ved å grave opp rotstokken. Glyfosat (Roundup) og fenoksysyrer er effektive.
Forfattere
Geir Wæhler GustavsenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Phytophthora infestans is an important pathogen on potato and tomato during the winter seasons in the north of Vietnam and all the year around in Lam Dong province in the south of Vietnam. Data from earlier studies of isolates of P. infestans collected in 2002-2003 showed that the P. infestans population on tomato and potato from Vietnam still consist of the "old" population. However preliminary studies of P. infestans samples from 2007 indicate that this situation has started to change. Data from aggressiveness tests of P. infestans isolates on tomato and potato showed that the majority of isolates collected from tomato could not infect potato. All tested isolates originating from potato infected both hosts. From 2005-2007, field experiments in tomato and potato using IPM strategies for controlling late blight have been carried out in Lam Dong province and in Hanoi area (north of Vietnam). In these experiments, cultivars with different levels of late blight resistance and different fungicide dosages have been tested. Simple forecasting methods and sanitation procedures were also included in some of the experiments. In Lam Dong, strategies including 7 days fixed spray intervals with full dose of the fungicide mancozeb did not control late blight properly in tomato, and all 4 tomato experiments were terminated early. In the potato experiments use of a more modern fungicide could control late blight using reduced dosages. In the tomato experiments in the north no natural infection of late blight occurred during the experimental period.
Sammendrag
Phytophthora infestans is an important pathogen on potato and tomato during the winter seasons in the north of Vietnam and all the year around in Lam Dong province in the south of Vietnam. Data from earlier studies of isolates of P. infestans collected in 2002-2003 showed that the P. infestans population on tomato and potato from Vietnam still consist of the "old" population. However preliminary studies of P. infestans samples from 2007 indicate that this situation has started to change. Data from aggressiveness tests of P. infestans isolates on tomato and potato showed that the majority of isolates collected from tomato could not infect potato. All tested isolates originating from potato infected both hosts. From 2005-2007, field experiments in tomato and potato using IPM strategies for controlling late blight have been carried out in Lam Dong province and in Hanoi area (north of Vietnam). In these experiments, cultivars with different levels of late blight resistance and different fungicide dosages have been tested. Simple forecasting methods and sanitation procedures were also included in some of the experiments. In Lam Dong, strategies including 7 days fixed spray intervals with full dose of the fungicide mancozeb did not control late blight properly in tomato, and all 4 tomato experiments were terminated early. In the potato experiments use of a more modern fungicide could control late blight using reduced dosages. In the tomato experiments in the north no natural infection of late blight occurred during the experimental period.
Sammendrag
For subsurface solute transport, flux concentrations are key, while usually resident concentrations are measured. Flux concentrations are frequently estimated from resident concentrations by temporal moment analysis. We tested this approach by simulating transport of an injected tracer during steady flow in an aquifer with a heterogeneous saturated hydraulic conductivity. We constructed grid-cell scale breakthrough curves (BTCs) from flux concentrations and approximate BTCs from resident concentrations and estimated flux concentrations. We assembled these BTCs into spatio-temporal leaching surfaces at various aquifer cross-sections for subsequent analysis. Resident concentrations were unsuitable to assess solute movement in the aquifer. Temporal moment analysis worked well when the entire aquifer cross-section was considered, but performed poorer at the grid-cell scale because it approximates the local velocity by the trajectory average. The leaching surfaces served as valuable tools to demonstrate and quantify the limitations of temporal moment analysis.