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
Audun KorsæthSammendrag
Det er ikke registrert sammendrag
Sammendrag
Norwegian agriculture has, as in most western-European countries, gone through several periods of change during the last 100 years. Pronounced changes have occurred in production systems and the spatial organisation of farm land, as well as agricultural policy. During the last 50 years, official statistics document a marked decline in the number of active farms. This decline has caused concern, as Norway traditionally has had an agricultural policy that emphasises self-sufficiency and rural settlement. Yet statistics also show that the amount of agricultural land in use has remained the same. This is usually explained through a larger proportion of tenanted land, as technological progress has allowed production levels to be maintained with a smaller workforce. Studies elsewhere in Europe show, however, that tenancy may not promote the same levels of investment and landscape management as owner occupation. To assess the potential impact of this change on Norway's landscape (and its value as both a cultural and tourism resource) we analyse tenancy patterns in Norwegian agriculture between 1999 and 2003. In particular we note that, even if owner occupation remains strong nationally, when the statistics are broken down by municipality, tenancy has increased significantly in some areas. This has left large areas of land managed as tenancies by a relatively small number of farmers, including parts of the iconic west coast fjords. We conclude therefore that further work is urgently required to establish whether the effects of tenancy seen elsewhere apply to Norway, whether this exposes key landscapes to increased risk of abandonment and if so what appropriate political responses there could be.
Forfattere
Lena Jakob Carl-Einar AmundsenSammendrag
Denne rapporten gir et revidert forslag til terskelverdier for de 16 stoffene og stoffgruppene det er definert terskelverdier for i Veileder 1:2009. Blant disse 16 stoffene og stoffgruppene er 11 inkludert i dagens vannforskrift (vedlegg IX). Forslag til terskelverdier for 15 andre stoffer og stoffgrupper som har utslippskilder relevant for norske forhold er også utarbeidet og inkludert i rapporten. Disse stoffene (se tabell 1) ble valgt ut på bakgrunn av aktuelle norske kilder (flyplasser, veier, metall- og aluminiumsindustri, skyte- og øvingsfelt, sigevann og avløpsvann). Stoffenes fysisk-, kjemiske og biologiske egenskaper (vannløselighet, fettløselighet, toksisitet etc.) ble også lagt til grunn for valget. Terskelverdiene som er foreslått er basert på at organismer som lever i vann som er påvirket av grunnvann ikke skal påvirkes negativt over tid pga forekomst av det aktuelle stoffet. Terskelverdiene som er valgt skal være beskyttende for både helse- og miljø. Vendepunktsverdien er satt til 75 % av terskelverdien. For bekjempningsmidler og PAH anbefales det å etablere terskelverdier for enkeltforbindelser. Organismer som lever i vann setter ofte strengere krav til innhold av forurensende stoffer enn mennesker. Terskelverdier for bekjempelsesmidler, kloroform, arsen, kadmium, bly, kvikksølv, krom, nikkel, kobber og fluorid er for eksempel lavere enn dagens grenseverdier for drikkevann.
Forfattere
Agnar Kvalbein Trygve S. AamlidSammendrag
Resultat fra første forsøksår med test av fem sorter innenfor raigras, engrapp og rødsvingel.
Forfattere
Steve Goldberg Kristin Kaspersen Jan Netland Øyvind Overskeid Trygve StølanSammendrag
Det er ikke registrert sammendrag
Forfattere
Therese With Berge Steve Goldberg Kristin Kaspersen Jan Netland Publikasjonsforfatter Trygve StølanSammendrag
Det er ikke registrert sammendrag
Forfattere
Therese With Berge Steve Goldberg Kristin Kaspersen Jan Netland Øyvind Overskeid Trygve StølanSammendrag
Det er ikke registrert sammendrag
Forfattere
Therese With Berge Steve Goldberg Kristin Kaspersen Jan Netland Øyvind Overskeid Trygve StølanSammendrag
Det er ikke registrert sammendrag
Forfattere
Trygve S. Aamlid Bjørn Molteberg Frank Enger Jan Tangsveen Trond Olav Pettersen Åge Susort Anne A. SteensohnSammendrag
Due to pesticide restrictions, harsh winters and the special light/temperature conditions at high latitudes, turfgrass variety testing in USA, UK or central Europe has limited relevance for the Nordic countries. Therefore, we recommend to seed companies wanting to introduce varieties in this region to have their candidates evaluated independently in the two contrasting climatic zones characterizing the Nordic countries. In June 2009, Scotts International B.V. and Bioforsk Turfgrass Research Group signed a contract for three years evaluation of two varieties of perennial ryegrass (Lolium perenne), one variety of creeping red fescue (Festuca rubra ssp. rubra) and two varieties of Kentucky bluegrass (Poa pratensis) at the Bioforsk research stations Apelsvoll (northern, mostly continental climatic zone) and Landvik (southern, mostly coastal climatic zone). Both trials were seeded in late June / early July 2009 and established well. Since about six weeks after seeding, the varieties were mowed to at 15 mm two to three times per week and otherwise maintained as a golf course fairway. This report from the establishment year shows that the candidate varieties were on level with the widely used control varieties for establishment rate. For other characters, it is too early to draw conclusions.
Sammendrag
The results from two field trials (Landvik and Apelsvoll) showed that the use of a proper combination of nitrogen rate and topdressing level is very important for thatch control. In coastal areas with ample rainfall, velvet bentgrass should be dusted with find sand every week or at least every other week, totalling around 10-14 mm per season. Nitrogen rate should be held at a level just to get an acceptable color. Weekly grooming, monthly verticutting and spiking twice a year are also needed to control thatch on velvet bentgrass greens, but heavy mechanical treatments should be avoided due to slow recuperative capacity of velvet bentgrass.