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.
1999
Forfattere
Øyvind Hansen Ole Kristian StornesSammendrag
Denne undersøkelsen har tatt for seg saueholdets utvikling i Nord-Norge. I tillegg har en ønsket å si noe om hva som kan skje i årene framover. Hvilke faktorer er viktigst for økonomien i saueholdet og hva er årsakene til at ulike sauebruk oppnår forskjellige driftsresultat? I Norge har sauetallet økt fra midten av 1970-tallet og fram til i 1996. I 1997 og i 1998 har det vært en tilbakegang. I 1998 var det i hele landet 1 035 215 vinterfôra sauer. For Nord-Norge var sauetallet på topp i 1994 med 171 143 vinterfôra sauer. I 1998 var det 156 325 sauer i Nord-Norge. Driftsgranskingene i jord- og skogbruk har vært et viktig datagrunnlag for denne undersøkelsen. I tillegg er det samlet inn regnskap for året 1997 fra 24 sauebruk fra Nord-Norge. Det er foretatt en spørreundersøkelse blant sauebrukerne i 4 nordnorske kommuner. Disse kommunene var Hemnes, Vestvågøy, Balsfjord og Tana. Den samme spørreundersøkelsen er også gjennomført blant sauebrukerne i driftsgranskingene i jordbruket. Utviklingen i antall sau er hentet fra tilskuddsregisteret. Antall brukere med sau har gått nedover både i Nord-Norge og i resten av landet. I 1991 var det 4155 sauebrukere i Nord-Norge. Dette tallet var redusert til 3085 i 1998. Dette har medført at det med årene har blitt flere sau på hvert bruk som har sau. [...]
Sammendrag
DOC concentrations in soil water in podzols decreased from median values of 37 and 39 mg/l in the F and H layers, respectively, to about 6 mg/l in the B horizon. The decrease was most pronounced in the mineral soil. An increase in concentrations was found in the surface soils in late summer and autumn, apparently due in large part to increased production, which took place in both the canopy and the forest floor, although evaporative concentration of soil water could also have been partially responsible. In the B horizon, increased concentrations of DOC could be observed in the autumn, although these increases were much lower than for the surface horizons. A correlation was found between the surface soil DOC concentrations and the mean surface soil temperature 1 to 2 months previously, which could be due to the buffering effect of sorption processes. However, the increase in the net amount leached could not be clearly attributed to increased temperature. In the autumn, concentrations did not decline immediately when temperature decreased, which may be due to leaching of previously adsorbed organic matter. During the autumn, concentrations of DOC in streams increased in periods of high discharge due to increased input of high-DOC surface soil water. At the same time, DOC concentrations in surface soil water largely decreased, presumably as DOC was washed out. An increase in DOC was not seen in periods of high discharge in the early spring. The highest concentrations of TOC (both with and without flux-weighting) at the weir were also found in the autumn). Correlation of TOC in streamwater with temperature was poor but, for the winter months, often significant. A positive correlation in the winter was probably associated with higher fluxes due to temperature-induced snowmelt. DON, which is the dominant form of dissolved nitrogen at all depths in the podzols at Birkenes, also decreased sharply in concentration in the mineral soil. However, there was an increase in the concentration of DON relative to DOC. The C/N ratio thus decreased downwards in the soil, indicating a possible preferential adsorption of N-poor DOC. Much of the DON in throughfall appeared to be of low molecular weight. This was not the case for DON in soil water.
Forfattere
Tore SkrøppaSammendrag
Det er ikke registrert sammendrag
Sammendrag
Two inbred rapeseed lines differing in aliphatic glucosinolate content and the reciprocal hybrids between them were grown under greenhouse conditions until seed maturity at three levels of sulphur supply. Heterosis was confirmed for seed yield and yield related traits irrespective of sulphur supply. Seeds harvested from the F1-hybrid plants were all high in aliphatic glucosinolates. The line low in aliphatic glucosinolates yielded seeds that were lower in methionine and cysteine than the other genotypes did at all levels of sulphur supply. It was, however, not more severely affected by suboptimal supply than the line high in glucosinolates
Forfattere
Stein Harald HjeltnesSammendrag
Holdbarheit er viktig inann pærer, og må vektleggjast sterkt i seleksjon. I vårt foredlingsprogram blir holdbarheit vurdert både som fastleik og indre nedbryting ved faste intervall, 4-8 og 12 døger etter uttak frå kjølelager. Fruktutviklinga målt ved fruktfastleik var svært variabel ved hausting, men det vart ikkje funne direkte samanheng mellom fastleik og indre nedbryting. Populasjonsgjennomsnitt er presenterte. Clara Frijs og Conference var gode foreldre, medan Broket Juli gav avkom med kort holdbarheit.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
B.N. StafsethSammendrag
Det er ikke registrert sammendrag
Forfattere
Trygve S. AamlidSammendrag
Det er ikke registrert sammendrag
Forfattere
Petter MarumSammendrag
Forage grasses and legumes have traditionally been conserved ex situ in seed banks. One criticism against the ex situ conservation methods is that it stops evolution that occurs in a changing environment. In situ and On Farm conservation is an interesting conservation method in forages. During our recent history a large number of landraces have been adapted to different local growing conditions. Usually the landraces are inferior to commercial cultivars. Grindstad timothy is an exemption, it is the best timothy cultivar in southern Norway. Grindstad is a good example how a landrace evolves over time to changing agricultural practises and demonstrate in a good way how powerful On Farm conservation can be in changing a landrace in a useful direction. In situ conservation should not be seen as an alternative to ex situ conservation, but rather as a useful complementary method.
Forfattere
Owe MartinssonSammendrag
Det er ikke registrert sammendrag