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.
2010
Forfattere
Unni AbrahamsenSammendrag
Foredrag under Kursuka 2010 for Norsk Landbruksrådgiving i Stjørdal
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Sissel Hansen Marina A. BlekenSammendrag
The sources of N2O in agricultural soil and strategies to reduce emissions are summarised. The main source of N2O in agricultural soil is denitrification. Conditions for N2O emissions are readily available nitrogen (mainly NO3), a partly anaerobic environment, and readily available carbon. The portion of N2O is greatest with low pH. To decrease N2O emissions from agriculture it is important to increase utilisation of applied nitrogen. Improved utilisation of available manure, reduced nitrogen surplus and improved growth conditions such as soil structure, drainage, and pH are important in this. Data from a longterm field trial with different fertilization and soil compaction are presented. The soil was experimentally compacted by two passes with a tractor, wheel by wheel, shortly before fertilization. Gas fluxes at the soil surface were measured by the soil cover method. In the NPK treatment, soil compaction by tractor traffic in this moist soil increased by two- to threefold the observed N2O emissions per kg of dry matter of feed produced. In cattle slurry treatments the effects of soil compaction on N2O emissions were less pronounced. The observed N2O emission per ha and per unit of production were higher with conventional fertilization than with fertilization adapted to organic dairy farming.
Forfattere
Anita SønstebySammendrag
Det er ikke registrert sammendrag
Forfattere
John Ingar Øverland Lars Tørres HavstadSammendrag
Avlingsresultatene i engrapp har variert for mye til at en kan gi en generell anbefaling om å tynne frøenga om høsten. Resultatene fra ett felt i Vestfold i 2009 tyder imidlertid på at tynning kan være aktuelt når den gjøres kort tid etter pussing tidlig om høsten. Med bakgrunn i resultatene fra feltet med timotei ser det lovende ut med hensyn til å kunne opprettholde avlingen ved bruk av tynning. Størst behov for kjemisk tynning vil det være i timoteifrøenger hvor halmen er fjernet etter tresking. Det er behov for flere forsøk før en kan gi noen endelige anbefalinger.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Dag-Ragnar Blystad Karen Rae Bone May Bente Brurberg Erling Fløistad Roar Moe Arild Sletten D. L. Davies Carl Jonas Jorge Spetz Sonja KlemsdalSammendrag
We have beendoing research on two phytoplasma diseases relevant for Norwegian plantproduction. Theoccurrence of Apple proliferation phytoplasma in NorwayOurinstitute was made aware of suspicious symptoms in 1996. A few trees of apple‘Summerred’ in Gvarv, Telmark County, had symptoms looking like appleproliferation. This case initiated a survey. The first samples were analyzed inEngland. Later we have done the PCR-diagnosis in our own lab.During asurvey carried out from 1996 to 1998, Apple proliferation was found in 14orchards: 1 experimental orchard inTelemark County, 4 orchards in Vestfold County, 4 orchards in Hordaland Countyand 5 orchards in the County of Sogn og Fjordane.Appleproliferation has later also been found at other locations. From this we canconclude that this quarantine disease is found in almost all importantfruit-producing districts. It is important to follow the situation to stopfurther spread of this disease. All infected trees have been eradicated.Theamount and distribution of Poinsettia branch-inducing phytoplasma in poinsettiaFree-branchingpoinsettias (Euphorbia pulcherrima) were first introduced during the sixties throughthe Norwegian cultivar ‘Annette Hegg’. The identity of the “branching agent”,was proven to be a phytoplasma, termed Poinsettia branch-inducing phytoplasma(PoiBI) (Lee et al. Int. Journal of Syst. Bacteriology 48,1153-1169.1998).Without phytoplasma, poinsettias grow tall, and produce very few branches.We havestudied the relative amount and distribution of PoiBI in poinsettia and howthis relates to branching in different cultivars grown under different lightlevels and temperatures using a quantitative PCR assay (TaqMan). Results fromthis work were presented.
Forfattere
Dag-Ragnar BlystadSammendrag
Det er ikke registrert sammendrag
Forfattere
Solveig HaukelandSammendrag
The slug parasitic nematode Phasmarhabditis hermaphrodita is commercially available for slug control in many European countries and is mainly used in home gardens against the grey field slug Deroceras reticulatum. It is also used to a certain extent against Arion lusitanicus even though the larger (adult) stages appear to be unaffected. Few studies have examined the efficacy of this nematode on all developmental stages of A. lusitanicus. Results from on-going studies on the effect of P. hermaphrodita on slug eggs and practical use of P. hermaphrodita will be presented.