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.
2006
Forfattere
Nils VagstadSammendrag
Det er ikke registrert sammendrag
Forfattere
Thomas Hartnik Frans Busser John Jensen Joop HermensSammendrag
During the last years biomimetic extractions have become quite popular to assess the bioavailable fraction in soils and sediments. These techniques can be divided in depleting and non-depleting techniques, those that are based on depletion of the aqueous phase and subsequent desorption of the weakly bound fraction of a compound, and those that try to avoid disturbing the equilibrium between solid and aqueous phase. We have performed experiments that try to identify chemical extraction methods that mimic exposure of earthworms for the non-ionic insecticide "-cypermethrin. The extractable amounts that were achieved by the different extraction techniques were then related to internal concentrations in earthworms and sublethal toxicity for earthworms. Extraction of soil using ß-cyclodextrin was used as a depletive method. The extraction was based on a method developed by Reid et al (2000) and optimized regarding extraction time, cyclodextrin concentration and analysis of the extracted fraction. Non-depletive solid phase microextraction (nd-SPME) was used as a non-depletive technique. As shown earlier the technique can be used to assess concentrations of freely dissolved compound in porewater. Our results show that at low concentrations (< 25 mg/kg) cyclodextrin-extractability correlate well with uptake of "-cypermethrin in earthworm. However, at high concentrations ß-cyclodextrin tends to overestimate uptake in earthworms. Non depletive SPME-extraction precisely mimics the uptake of "-cypermethrin in earthworms both at low and high compound concentrations in soil. Differences between the extraction techniques will be discussed and explanation for the different extraction patterns given.
Forfattere
Erik Næsset Terje Gobakken Annika Kangas Matti Maltamo Ole Martin Bollandsås Tord Aasland Svein SolbergSammendrag
Det er ikke registrert sammendrag
Forfattere
Erik Næsset Terje Gobakken Annika Kangas Matti Maltamo Ole Martin Bollandsås Tord Aasland Svein SolbergSammendrag
Det er ikke registrert sammendrag
Sammendrag
The occurrence of Fusarium (represented by Fusarium spp. and Microdochium nivale) has been recorded in barley, oats and spring wheat seeds in Norway since the 1970-ies as part of the seed quality assessment. Annually a large number of samples representing both certified and farm saved seed from all cereal growing areas, was tested (100 or 200 seeds from each sample) at the Seed Testing Laboratory using the freezing blotter, the Doyer filter paper, and/or the agar plate (PDA) methods. In total, almost 30 000 samples of barley, more than 16 000 samples of oats and more than 9 000 samples of spring wheat were tested. The Fusarium frequencies were recorded in each sample, a mean of all samples was calculated each year for each cereal species, and multiple regressions with weather data from the growing season and also the Fusarium incidences in seed the previous year, were carried out. 69 % of the variation of the incidence of Fusarium in barley seeds was explained by 1) precipitation in July, 2) the incidence of Fusarium the previous year (both significant positive effects), and 3) precipitation in June, 4) temperature in July (both significant negative effects). In oat seed, precipitation in July and incidence of Fusarium the previous year explained 59 % of the variation. In spring wheat, as for barley and oats, precipitation in July and the incidence of Fusarium the previous year contributed positively, whereas precipitation in May and temperature in August had a negative effect.These four factors contributed significantly by 58% to the variation of Fusarium in spring wheat seed. It is concluded that the incidence of Fusarium in seed the previous year and precipitation in July were the main factors affecting the incidence of Fusarium in cereal seeds in Norway.
Forfattere
Gunn Mari StrømengSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Inger HansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Halvor AlmSammendrag
Fagforum Potet
Forfattere
Per Y. SteinsholtSammendrag
Presentasjon av overgangen fra Hveem Forsøksgard til et nytt Fagforum potet på Bioforsk Apelsvoll, samt avtalen mellom HOFF og Apelsvoll, samt status for dette.