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
Birger VoldenSammendrag
I alt 24 feltforsøk i 1997 og 1998 med fire bygg- og fire havresorter ble utført i forsøks-ringer i alle landsdeler. Det skulle høstes ved skyting og deigmodning, men samtidig for sortene av hver art. Nær halvdelen av feltene ble sådd etter midten av juni, og for flere av dem ble veksttida for kort til at havren nådde deigmodning.I felter høstet etter planen var avlingen ved første høstetid 457 kg tørrstoff pr dekar for bygg og 542 kg for havre. Ved deigmodning hadde avlingen økt med 68% for bygg og 62% for havre. Dette tilsvarer 10"11 kg økt tørrstoffavling pr dekar pr. dag fra skyting til deigmodning. Tidligste byggsort (Arve) hadde størst avling, og seineste sort (Sunnita) hadde minst avling ved tidlig høsting. Ved siste høstetid var det ikke sikker forskjell mellom byggsortene. For havre var det ingen forskjell mellom sortene ved tidlig høsting, men 114 kg større tørrstoffavling av Biri enn Olram ved siste høsting. Det var ingen sikre forskjeller mellom arter og sorter verken i proteininnhold eller in vitro fordøyelighet ved noen av høstingene. Proteininnholdet gikk ned ved utsatt høsting med 2,6"2,8 prosentenheter for begge artene, og fordøyeligheten avtok samtidig med 6,8 prosentenheter for bygg og 8,7 enheter for havre. Lavt protein- og energiinnhold ved sein høsting tilsier at slikt korngrønnfôr ikke nyttes som eneste grovfôr til middels og høgtytende melkekyr
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.