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.
2006
Forfattere
Geir Wæhler GustavsenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Six cropping systems, ranging from conventional arable without livestock to organic livestock farming with few arable crops, have been compared since 1989 on a loam soil. Soil structure indicators measured initially included organic matter levels, pore size distribution and air permeability. These parameters were re-measured after 15 years, when the size distribution and stability of aggregates was also measured. A decline in soil structure quality was found in the system with conventional autumn ploughing with no rotational grass. This system had higher bulk density and mean aggregate size than other systems, and lower levels of plant available water and aggregate stability. Opposite trends were related to the proportion of grass leys in the other systems and to their levels of soil organic matter. The latter declined markedly over 15 years in the conventional arable system, and there were smaller declines in most other systems. In an arable system without ploughing, organic matter was maintained and high structural stability was found. This system had high bulk density, but the proportion of small aggregates equalled that found in the systems with ley. Satisfactory soil structure was maintained in systems with 50% leys in the rotation, in agreement with Norwegian long-term studies of the effect of crop rotation type on soil organic matter. Though the deterioration of soil structure in the all-arable system was not extreme, as the soil had good structure initially, the results have serious implications for the sustainability of stockless arable systems on soils with a less favourable starting point.
Sammendrag
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Forfattere
Tormod BriseidSammendrag
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Forfattere
Olav Arne Bævre Øystein Lund Bø Svein GrimstadSammendrag
Den norske veksthusnæringen bruker anslagsvis vel 1 000 GWh per år. Den primære energikilden er i dag elektrisitet fulgt av naturgass/propan. Elektrisk energi er både fleksibel (lys, varme) og enkel i bruk, mens olje er i dag mest å betrakte som ren "back-up"-løsning. Bruk av naturgass er imidelrtid økende i områder hvor den er tilgjengelig. I Rogaland er nå 103 gartnerier knyttet til Lyses gassnettverk, og veksthusnæringen bruker naturgass tilsvarende ca. 180 GWh per år. Det utgjør nesten 50 % av rør-transmitert naturgass i regionen. I artikkelen drøftes mulighetene for bruk av naturgass som energibærer og CO2-kilde, og en bedre utnyttelse av energi generelt.
Sammendrag
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Forfattere
Lars Olav BrandsæterSammendrag
Foredrag om ugras, biologi og ugraskontroll i frøeng
Forfattere
Bjørn Molteberg Bernt Olav HoelSammendrag
Tilgjenglighet: Begrenset
Forfattere
Solveig HaukelandSammendrag
The use of entomopathogenic nematodes against the vine weevil Otiorynchus sulcatus was studied under field conditions. A number of field trials were conducted using two commercial products of EPN, Nemasys H (Heterorhabditis megidis) and Nemasys L (Steinernema kraussei). The results from these trials indicate that low temperature is still a limiting factor for the successful use of EPN against O. sulcatus in Northern Europe. Furthermore it was observed that application methods of EPN in field grown strawberries requires improvement.
Sammendrag
Det er ikke registrert sammendrag