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.
2007
Forfattere
Bent J Nielsen Jens G Hansen Hans Pinnschmidt Ragnhild Nærstad Arne Hermansen Vinh Hong Le Asko HannukkalaSammendrag
Influence of weather conditions on sporangia production, release, viability and infection of potato late blight (Phytophthora infestans) was investigated in Denmark, Norway and Finland using Burkard spore traps and exposure of trap plants in field plots. High amounts of sporangia were trapped after night with long periods with high relative humidity. Sporangia produced in one humidity period were mainly released at the first humidity drop in the morning hours, but there were also some "delayed sporangia release". Local new infections occurred mainly during the morning hours when the leaves were still wet. On many days sporangia did not survive until the afternoon and the results indicate that conditions for survival of sporangia and infection are major bottlenecks for the spread and development of the disease
Sammendrag
Empirical evidence that the N dissipation from dairy production depends tightly on the segregation of animals from plant production is provided
Sammendrag
Empirical evidence that the N dissipation from dairy production depends tightly on the segregation of animals from plant production is provided
Forfattere
Solveig Haukeland Arild AndersenSammendrag
Preliminary results from a Norwegian project performed 2005-2008 was presented. It includes identifying the geographical distribution and life cycle of the species in Norway, testing different methods for control in private gardens, and evaluating the nematode Phasmarhabditis hermaphrodita. Foreløpige resultater fra et norsk forskningsprosjekt 2005-2008 ble presentert. Det inkluderer utbredelse og livssyklus i Norge, utprøving av ulike bekjempingsmetoder i privathager, og evaluering av nematoden Phasmarhabditis hermaphrodita.
Forfattere
Solveig HaukelandSammendrag
Entomopathogenic nematodes (EPNs) are commercially available for control of soil dwelling larvae of the vine weevil (Otiorhynchus sulcatus). In Europe several products are available comprising three different species, Heterorhabditis bacteriophora, H. megidis, and Steinernema kraussei. The latter species is for use at low temperatures. Results from several trials using H. megidis and S. kraussei against vine weevil in strawberry fields indicate that low temperature, soil type and possibly the application method are limiting factors that appear to reduce their efficacy. The use of EPNs against vine weevil larvae in the field will be discussed including results from cold-activity studies and application methods.
Sammendrag
Different methods to reduce the population of Arion lusitanicus are being investigated in private gardens naturally infested with the slug. In the laboratory the effect of different mulches are also being tested. Preliminary results from the studies conducted in gardens indicate that physical removal of slugs by picking or trapping and killing is most effective. In arenas in the laboratory, slugs avoided cocoa chips mulch and alginate granules. These studies are on-going and will be completed at the end of 2008. The slug parasitic nematode Phasmarhabditis hermaphrodita has recently been isolated in Norway. It is being studied as a biological control agent of A. lusitanicus. Results so far show that young slugs (0,02 " 0,04g) are most susceptible to infection and death. It also appeared that soil based bioassays gave better and more consistent results than assays using Petri dishes with filter paper. Further studies on the host-parasitic relationship of the nematode and slug are required.
Forfattere
Anne Ragnhild Thomlevold Bastian HoffmannSammendrag
Det er ikke registrert sammendrag
Forfattere
Jon Magne HoltenSammendrag
I økologisk landbruk er det viktig å utnytte alle næringsstoffene på gården. Hvis grønngjødslinga høstes og fermenteres i et biogassanlegg får en både en biorest som er et godt gjødselmiddel og biogass til drivstoff eller oppvarming. Metoden er særlig aktuell i husdyrløs økologisk drift.
Forfattere
Svein Ø. Solberg Kari Bysveen Trygve S. AamlidSammendrag
Subterranean clover (Trifolium subterraneum) as a companion crop during establishment of organic timothy (Phleum pratense) seed crops was examined in four field trials studies in SE Norway from 2001 to 2004. Clover and timothy were either mixed before sowing or seeded in every other row with the possibility of removing winter-surviving plants of clover in the spring of ley year 1. Trifolium alexandrinum, T. resupinatum, T. incarnatum, Melilotus officinalis, Lotus corniculatus and Melicago lupulina were also included in the study, in addition to control plots with no legume companion crop. No manure was applied except to the spring wheat cover crop in the year of establishment. The results showed that subterranean clover was the most promising legume, resulting in a 20 % increase in timothy seed yield in the first seed harvest year. The result could partly be explained by less competition from weeds during the establishment of the seed crop. In autumn of the sowing year, after the wheat had been harvested, subterranean clover covered up to 70 % of the soil surface, leaving less space for weeds. During the following winter, subterranean clover died, leaving more space to the first year timothy seed crop. The positive results with subterranean clover as a companion crop were confirmed by on-farm studies at three different sites. A seed mixture of 0.5-0.7 kg ha-1 timothy and 1.0-1.2 kg ha-1 subterranean clover is now recommended when establishing organic timothy seed crops on farms with no or limited access to manure.
Forfattere
Gunnlaug RøtheSammendrag
Det vert ofte hevda at sauebruk er enkle å leggja om til økologisk drift. Denne påstanden høver godt når ein har rikeleg med areal og mineraljord med høgt innhald av organisk materiale som dominerande jordtype. Vidare er det viktig å ha rikelig og godt beite og romsleg driftsbygning egna for utviding. Lett traktor og veleigna reiskapar vil også vera positivt . Alt avheng likevel av brukaren som skal gjennomføra omlegging av garden til økologisk landbruk og driva etter økolgoiske prinsipp.