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.
2010
Forfattere
Christer MagnussonSammendrag
S.radicicola is a parasite of barley and grasses like Poa annua and P.pratensis. The life cycle of a Norwegian population of S.radicicola (Poa-race) is studied in the laboratory by inoculating newly germinated P.annua (cv. Leif) with 140 juveniles from field collected galls and keeping the plants at 25˚C and 16 hrs light period. Juvenile stages are separated based on genital development. The first stage (J1) has 1 cell, while the following stages J2, J3 and J4 has 2, 3 and 4 (or more) cells in their genital primordia. J1 (L = 310-350μm) moults in the egg and J2 (L = 330-400μm) is the hatching stage. Nematodes emigrating from field collected galls were all J3:s (L = 360-430μm), and moulted outside the gall to J4 (L = 210-500μm). The first stage to appear in newly formed galls is large J4 (L=500-870 μm), which moults within 5 days to adult (L=820-1980 μm). Egg-laying starts within 13 days and eggs hatch after 22 days. Juvenile development in eggs starts at 5˚C, and 640 degree days are required for completing one generation corresponding to about 30 days at 25˚C. This means that in Norway S.radicicola may have up to 3 generations per year. The fact that J3 exit the galls and the large J4 is the first stage present in newly formed galls makes us speculate that the induction of gall formation occurs from outside by pre-infective J4, which later infects and develop inside the gall. Key Words: Root gall nematode, Subanguina radicicola, Poa annua, life cycle, Norway
Forfattere
Venche TalgøSammendrag
Phytophthora spp., powdery mildews, Neonectria sp. and others
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Use of organic fertilizers in fish pond has been common since ancient times. Applying fertilizers stimulates the growth of phytoplankton, primary producers of the fish food chain. Artificial nitrogen and phosphorus fertilizers are nowadays the main types of nutrients supply in ponds. However, the use of mineral fertilizers is not sustainable due to the use of nonrenewable resource and the impact on the environment. Moreover, the Norwegian government has defined the national ambition that organic food production and food consumption should be more than 15% by 2020. Modern societies produce large amount of organic wastes, which could be reused. Ahead of utilizing such waste as fertilizers in aquaculture, the first step is to gain knowledge about the mineralization patterns in seawater. This knowledge is important to ensure proper supply time and proper amount of nutrients from waste for optimal production with minimal negative impact on the environment This poster will present a study about nitrogen mineralization pattern from organic materials relevant as fertilizers in sustainable aquaculture.
Forfattere
Ingunn ØvsthusSammendrag
Det er ikke registrert sammendrag
Sammendrag
Presentajon av resutlater fra tre års forsøk i prosjektet "Organic protein feed and edible oil from oilseed crops". Resultater fra forsøk med nitrogengjødsling og ulike forgrøder til vårrybs og dodre presenteres. Sykdomssituasjonen i forsøkene diskuteres. Både vårrybs og dodre ser ut til å oppnå et akseptabelt avlingsnivå i økologisk produksjon. Dodre synes å være en interessant ny vekst selv om siste års forsøk viser at vi også her kan få utfordringer med skadegjørere. Det kan se ut som om oljeinnholdet i dodrefrøene varierer i større grad med tilgjengelig nitrogen enn for vårrybs, noe som tyder på at en bør være forsiktig med å tilføre for mye nitrogengjødsel til denne kulturen. Se hele artikkelen
Sammendrag
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Sammendrag
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Sammendrag
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Sammendrag
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