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.
2005
Sammendrag
Fondazione Minoprio
Forfattere
Arne SæbøSammendrag
Rogaland i utvikling
Sammendrag
Utvalg av trær i grøntanlegg
Sammendrag
Utvalg av trær i grøntanlegg
Sammendrag
Utvalg av trær i grøntanlegg I. Stressfaktorer.
Sammendrag
Asiatiske trebukker- på vei til Norge?
Forfattere
Liv Synnøve Sognnes Gustav Fystro Samson ØpstadSammendrag
Cultivation and utilisation of peat soil are connected with several problems related to its high water content, weak soil skeleton, low bearing capacity, poor thermal properties and insufficient soil aeration. The problems have become even more pronounced with the increasing weight of agricultural machinery and more frequent harvesting. Also, peat soil is prone to sinking and disruption by frost. Reduced infiltration makes the most productive grass loose in the competition with other inferior types of grass and weeds. During the period 1978"1995, a long-term field trial was conducted on highly decomposed peat soil in order to investigate the impact of adding mineral materials to improve soil characteristics and increase grass yield. Generally, addition of both shell sand and moraine soil improved the physical properties of the soil and grass production. The first nine years, shell sand (400 m3 ha-1) was most efficient. Thereafter, moraine soil (400 and 800 m3 ha-1) seemed most beneficial. This study indicates that additions of shell sand or moraine soil to peat are appropriate methods to improve and conserve the physical properties and cropping potential of these vulnerable soils.
Forfattere
Arne SæbøSammendrag
Kompost og slam til juletre
Sammendrag
Næringsstofmangel hos nordmannsgran kan ofte erkendes på nålefarven. Dette videnblad giver eksempler på nålesymptomer ved mangel på kvælstof, magnesium, kalium og mangan.
Forfattere
May-Guri Saethre Trond HofsvangSammendrag
Timed catches of Cydia pomonella (L.) males in sex pheromone traps were used to investigate the influence of twilight and climatic parameters on the flight activity of the moths at different latitudes. Traps were operated from 15 May until 31 July at several locations between 59ºN and 60ºN in south-eastern Norway, and at Sogndal (61ºN) in western Norway, during 1997-2000. Time and duration of twilights were calculated from May-August for each trap-location, and compared with the activity of C. pomonella. Flight response appeared to be determined by the daily photoperiod, corresponding to time of sunset at the different latitudes involved in the study. This response began about two hours before sunset, and declined around 23:00 and 24:00 hours in the evening, in western and eastern Norway, respectively. Main flight activity in both eastern and western Norway was recorded when temperatures were in the range 10-20 ºC, the relative humidity was above 50 %, and at wind speeds below three m/s at the time of capture. In Norway, light conditions are suitable for C. pomonella flight activity all night long during the entire lifetime of the adult moths. It is concluded that temperature is the limiting factor for flight at high latitudes.