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
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.
Sammendrag
Insect-induced damages in forests are a major concern for timber production, landscape conservation and ecosystem research. Early detection methods based on remote sensing data can document the severity and spatial extent of ongoing attacks and might aid in designing mitigation measures or even prevention where necessary. In southeastern Norway, a large-scale insect defoliation of pine trees is ongoing. The larvae of the Pine sawfly Neodiprion sertifer reate it with its mass attacks during their feeding on needles in June and July. In the winter before the attack, egg galleries are evident in the needles. This provides a test case for early detection methods and remote sensing techniques for monitoring forest health....
Forfattere
Trygve S. AamlidSammendrag
I dette intervjuet oppfordrer Hans Johan Kjølsrød til større satsing på norsk frøavl, først og fremst av timotei for eksport. Han betoner viktigheten av god rådgivning.
Forfattere
Liv Birkeland (sluttet)Sammendrag
Økologisk mat er et populært innslag på festivaler og andre arrangementer. For å kunne markeds føre maten som økologisk, må man få en godkjenning fra Debio i forkant av arrangementet. Godkjenningen gir deg rett til å benytte Ø-merket i markedsføringen - et merke som 90 prosent av Norges befolkning kjenner igjen.
Forfattere
Espen Tangen Aarnes Martin SmithSammendrag
For dem som ferdes i bjørneområder er det viktig å ha kjennskap til bjørnens adferd, og hvordan man selv skal reagere ved møte med bjørn. God kunnskap på disse feltene vil minske sjansen for uheldige utfall av nærgående møter med bjørn.