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.
2013
Forfattere
Marianne Lundervik Bøthun Jan Meland Harald Nornes Mekjell MelandSammendrag
Det er ikke registrert sammendrag
Forfattere
Liv Østrem Birger Volden Arild LarsenSammendrag
The potential of ×Festulolium as a forage species for Nordic conditions was investigated by comparing Norwegian candivars (LpFp-T, LmFp-T, LpFp-D-N, LpFp-D-UK) differing in parental origin and ploidy level with commercial cultivars of ×Festulolium (Hykor, Felopa), the parental species perennial ryegrass (Lolium perenne L.) and meadow fescue (Festuca pratensis L.), and timothy (Phleum pratense L.). Plant development was observed as leaf:stem ratio and standardised development stage, and dry matter yield and digestibility were studied throughout two consecutive harvest seasons (2007 and 2008) as an effect of taking the first cut at four maturity stages, namely: 1) vegetative growth, 2) early heading), 3) heading and 4) anthesis, and then consecutive cuts throughout the season. Observations were made at two locations in Norway (61°N, 67°N). Leaf:stem ratio and standardised development stage were affected by maturity stage, and the loloid types of ×Festulolium (Felopa and the candivars) grouped between the parental species as to developmental pattern. The most extreme changes across maturity stages 1-4 in first cut were seen in the festucoid type Hykor (smallest) and in timothy (largest). Across maturity stages 2 and 3, for two years Hykor obtained higher dry matter yield than the other entries, but overall digestible dry matter yield was equal in Hykor and LpFp-T due to the better digestibility in LpFp-T. The lower dry matter yield obtained in ×Festulolium Felopa, the diploid candivars and LmFp-T was mainly due to winter damages. Consistency was found between the locations for the entries investigated. For Nordic growing conditions, in which winter hardiness is required for commercial cultivars, the amphitetraploid breeding approach of perennial ryegrass and meadow fescue should be pursued. It is the parental origin of the candivar LpFp-T, which was comparable to Hykor, the best of the commercial ×Festulolium cultivars, and performed better than the cultivars of the parental species.
Forfattere
Liv Ostrem Birger Volden Arild LarsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Inger MartinussenSammendrag
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Forfattere
Peder Gjerdrum Birger EikenesSammendrag
Strength properties are central for most wood applications. This paper describes variation of and co-variation between various strength parameters observed in clear wood. More than a dozen strength and density parameters were measured, each on ten samples from five different height levels from each of 21 planted, mature spruce trees. In general, strength and coefficient of variation comply with standard listed values. Between strength parameters usually modest, but always positive, correlation was found. Only 53% of the overall strength variation could be extracted in the first principal component, related to density. MOE and MOR are the two most closely correlated traits, and cleavage the one to show weakest connection to all other traits. Compression, MOR and hardness are closest correlated to density; however, the significance of density being partially masked by a considerable variation between samples from similar locations in the stem supposed to demonstrate parallel quality. All traits are stronger correlated to density than to ring width. In addition to density a substantial part, 5 to 30%, of strength variation could be attributed to tree effect, indication a potential for strength improvement by genetic selection. The finding confirms strength parameters to be far from collinear, i.e. strength is truly multidimensional.
Forfattere
Rose Bergslid Arnar Lyche John Eikenes Trond Malmedal Anders ØverbøSammendrag
Å få spredd husdyrgjødsla i rett mengde på rett sted til rett tid har blitt en utfordring for bøndene. Buskapene har blitt færre men større, og bonden har fått mer møkk å håndtere. Mange har for lite gjødsellager og er avhengige av å spre møkk om høsten for å sikre nødvendig kapasitet fram til våren. Med større drift har også transportavstandene til jordbruksarealet økt. Mottrekket er større og tyngre gjødselvogner, men dette har sine negative bieffekter som mer jordpakking og kjøreskader. Myndighetene arbeider med å revidere regelverket som omhandler lagring og spredning av husdyrgjødsel. For å endre praksisen i retning bedre utnytting og mindre næringstap, er det ønske om å skjerpe kravene til bonden. Hvordan håndterer vi gapet mellom praktisk sitasjon og regelverk? Og hvordan forbedrer vi praksisen?
Forfattere
Erik JonerSammendrag
Det er ikke registrert sammendrag
Forfattere
Erik J. JonerSammendrag
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Forfattere
Ingerd Skow HofgaardSammendrag
Det er ikke registrert sammendrag
Forfattere
Ingerd Skow HofgaardSammendrag
Det er ikke registrert sammendrag