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
Sammendrag
Clonal plants of Leuzea charthamoides and Rhodiola rosea and plants from one seedpopulation of Serratula coronata were grown at 5 different temperature treatments in a phytotrone. The treatments were 9, 15, 21 day/9 night and 21 degrees. All these treatments had 24 hours of light. In addition there was one treatment at 21 degrees with only 12 hours day. At 21 degrees the growth was reduced by short days for all species. Rhodiola grow best at low temperatures (9 degrees) and results indicate that it prefers differentiated day/night temperatures. On the contrary Serratula grows best at 21 degrees, and had a very slow growth at 9 degrees. The analysis of the level of adaptogens is not available yet.
Forfattere
Ragnhild Hafskjold Nærstad Arne Hermansen Tore BjorSammendrag
A series of field trials combining cultivars with different levels of resistance to Phythophtora infestans and different haulm killing methods was conducted in 1997, 1998 and 1999 to assess the contamination potential of the haulm. In addition, the frequency of tubers with late blight was assessed after harvest and storage, combining effects of pretreatment infection, infection by the haulm at harvest and the development of the disease during storage. Haulm killing was performed by diquat (200, 400, 600 g a.i. ha-1), half cutting of the haulm in combination with diquat (100, 200, 300 g a.i. ha-1) or full cutting of the haulm. In those treatments where haulm killing was performed purely chemically the haulm remnants¿ contamination potential tended to increase at reduced doses. Full mechanical destruction gave as low a contamination potential as application of the full dose of chemical haulm killer. However, there were no consistent differences between the haulm killing treatments in the frequency of blighted tubers after harvest and storage. This indicates that the input of chemical haulm killers may be reduced. There was a large difference between years in tuber blight after harvest and storage, which confirms that climatic factors are of major importance for tuber infection. The large difference found between the cultivars in the frequency of tuber blight indicates that tuber resistance should be an important part of integrated late blight disease management.
Forfattere
Kathrine Høybakk Anita Tøsse T. Nilsen Silje Engdal Bent Håvard Hellum Jens Rohloff Mette Thomsen Odd Georg NilsenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Introduction: The aim of the present study was to investigate how a temperature increase during autumn will affect frost hardening, winter survival and spring growth of perennial ryegrass (Lolium perenne L.) on a coastal location in Norway, at the present and a future CO2 level. Conclusions: The predicted increase in CO2 will have a limited effect on the frost hardening in this environment. A temperature increase of 2 "C in the autumn will delay hardening and reduce the frost tolerance to some extent. However, the best available cultivars will in most cases be frost hardy enough even with this small reduction.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Sissel Hansen Marina A. Bleken Bishal SitaulaSammendrag
The effects of fertilization and tractor traffic on N2O emission and CH4 uptake in an agricultural soil were studied in a long-term field trial with different fertilization and soil compaction. The soil was a well-drained sandy loam and the crop rotation was rich in leys and legumes adapted to organic farming practise. The fertilization treatments reported here are: Conventional fertilization practise; compound fertilizer with NH4NO3 (NPK), cattle slurry high, cattle slurry level adjusted to organic fertilization practise (CSO), and an unfertilized treatment. 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. Conventional fertilization practise (NPK) resulted in 2.1 to 3.4 times higher N2O emissions than with CSO in uncompacted and compacted soil, respectively, in year 7, and 1.0 and 3.0 times higher in year 9. The accumulated CH4 uptake was reduced by 52 % by soil compaction, 50 % on average by fertilization, and 78 % by soil compaction and fertilization combined. Fertilization with NH4NO3 or cattle slurry had similar effects.
Forfattere
Sissel Hansen Marina Azzaroli Bleken Bishal K. SitaulaSammendrag
Det er ikke registrert sammendrag
Sammendrag
A publication has been made by Bioforsk in order to survey the subject of urban green areas and human health and well-being from different perspectives. One important reason for doing such a survey in Norway is to show the government how important the urban green areas are. Bioforsk have several areas that may contribute to a better use of the resources used in Norewegian urban green areas. The institute is developing effective and sustainable strategies for controlling weeds and deceases on plant materials. There is also focus on the design and use of urban soils and how to manage urban green areas in order to obtain good quality and low resource input.
Forfattere
Asrun Elmarsdottir Arne Fjellberg Gudmundur Halldórsson Maria Ingimarsdottir Olafur K. Nielsen Per Holm Nygaard Bjarni D. SigurdssonSammendrag
Recently, there has been increased emphasis on conserving biodiversity, threatened habitats and ecosystems in the Nordic countries. The Nordic countries have signed the Convention on Biological Diversity, thus embracing the target of halting the decline in biodiversity by the year 2010. Therefore it is important to identify the effects that afforestation has on biodiversity and the functioning of ecosystems......
Forfattere
Bernt-Håvard Øyen Per Holm NygaardSammendrag
From the first plantings and experiences in the afforestation areas in West and North Norway it became evident that there was a large potential for increasing the yield by changing tree species, especially from mismanaged broadleaves and pine to dense spruce plantations. The focal point in this chapter will therefore be the experience in Norway, with some examplesfrom other countries.....