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.
2000
Forfattere
M. Finne A. Rognli Ivar SchjelderupSammendrag
Det er ikke registrert sammendrag
Forfattere
M. Finne A. Rognli Ivar SchjelderupSammendrag
Det er ikke registrert sammendrag
Forfattere
M. Finne A. Rognli Ivar SchjelderupSammendrag
Det er ikke registrert sammendrag
Forfattere
Trygve S. Aamlid O. Heide B. BoeltSammendrag
The flowering requirements of six European varieties of Lolium perenne L. were studied in controlled environments. In experiments on primary induction, flowering was recorded after transfer to long days (LD) in a greenhouse at 12-24°C. In experiments on secondary induction, primary induction was first accomplished at 6°C / 10 h daylength for 12 weeks. When evaluated by the 50% heading criterion, the requirement for duration of primary induction at 6°C / 8 h daylength was
Sammendrag
The early growth of spring barley (Hordeum vulgare L.), Brassica rapa L. ssp. oleifera (DC.) Metzger, Stellaria media (L.) Vill., and Viola arvensis Murray in growth chambers and in shading cages outdoors at different irradiance levels was compared. Leaf area and shoot dry weight were lower outdoors than in growth chambers at similar irradiance and temperature. A simulation model with incorporated temperature and irradiance responses from growth chambers was used to test if outdoor growth could be properly estimated. The correlations between simulated and measured values of leaf area index (LAI) and shoot dry weight were high. However, with some exceptions, overestimations occurred, more for shoot dry weight than LAI, and more for 100% daylight than lower irradiance. The reasons for this are discussed.
Forfattere
Leiv MortensenSammendrag
The short-day plants Begoniaxcheimantha, Chrysanthemum morifolium (one pot and one cut cultivar), Euphorbia pulcherrima (poinsettia) and Kalanchoe blossfeldiana were grown at vapour pressure deficits (VPDs) of 155, 420 and 660 Pa (corresponding to 93, 81 and 70% relative air humidity, respectively). Growth, flowering, keeping quality and water relations were tested
Forfattere
Gustav FystroSammendrag
The use of near infrared reflectance spectroscopy (NIRS) to predict potential carbon (C) and nitrogen (N) mineralisation in Norwegian grassland soils was investigated. Reference values of mineralisation were produced by aerobic incubation of soils, from which the course roots and stubble had been removed. NIRS was calibrated against 70 samples with a wide range in soil characteristics. Another 30 samples, taken from two other sites, were used to validate the predictive accuracy of the NIRS technique. A significant correlation was observed between the reference and NIRS values of potential C and N mineralisation on samples used during the calibration process. Increased error and significant bias occurred occasionally, when new samples were predicted. However, with site-specific calibrations the accuracy of performance was improved. The results of the comparisons with measured C and N mineralisation potentials, suggest that NIRS offers a promising alternative to otherwise time-consuming laboratory incubations, with the additional benefit of being a non-destructive analysis.
Forfattere
G. GuttormsenSammendrag
The nitrogen effect of the previos crop was greatest after winter cabbage, while Italian ryegrass and summer cabbage gave a considerable lower effect
Sammendrag
Brassiceye traps baited with ethylisothiocyanate were modified and used to collect live adults of Delia radicum (L.) and Delia floralis (Fallén) (Diptera: Anthomyiidae) from the field to observe the prevalence of Entomophthora muscae (Cohn) Fresenius and Strongwellsea castrans Batko & Weiser. The traps were highly effective and selective for D. radicum and D. floralis. Of the flies identified, 98.4% in 1996 and 93.7% in 1997 were either D. radicum or D. floralis. In 1997 the maximum mean catch was as high as 82 flies per trap per day, and more than 80% of these were females. During both seasons E. muscae caused relatively high levels of mortality in adult populations of D. radicum and D. floralis. The fungus caused a total infection level of 17.9% in 1996 and 47.7% in 1997 with infection peaks of 82.4% in 1996 and 87.5% in 1997. Both years, a significant positive correlation was found between E. muscae prevalence and temperature. One infection peak was observed for S. castrans in 1996, and during that season the total S. castrans infection level was 18.0%. In 1997, the total S. castrans infection level was as low as 8.1%. There is no strong indication that the prevalence of E. muscae or S. castrans differs between either the fly species or sexes within species.
Forfattere
Tor LunnanSammendrag
Bladfaks har høg avlingskapasitet i eit toslåttssystem. Arten toler betre tørke og er meir varig enn timotei, men fôrkvaliteten er mindre kjent. Ein forsøksserie med fire sortar av bladfaks, Løfar, Leif, Manchar og Carlton, med to sortar av timotei, Grindstad og Bodin, og med to haustetider for førsteslåtten, er kjørt på 20 stader i Sør-Noreg. Fôrprøver er analyserte med NIR for fordøyelegheit, fiberfraksjonar, protein- og mineralinnhald. Bladfaks gav høgare tørrstoffavling enn timotei, spesielt i høgareliggjande strøk. Av sortane gav Leif og Manchar bladfaks og Grindstad timotei best avling. Timotei konkurrerte bra mot bladfaks første engåret, men seinare gav timotei lågare avling og høgare ugrasinnhald i enga enn bladfaks. For å få same fôreiningskonsentrasjon, måtte bladfaks haustast om lag ei veke før timotei i førsteslåtten. Innhaldet av NDF og råprotein var om lag likt for timotei og bladfaks hausta til same tid. Etter lik gjødsling førte bladfaks i middel bort ca. 2 kg nitrogen og 4 kg kalium meir med avlinga enn timotei.