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.
2007
Forfattere
Martin Gierus Anjo Elgersma Michael Kreuzer Ralf Loges Harm J. Smit Håvard Steinshamn Fridhelm Taube Michael WachendorfSammendrag
Resultat frå simulert beiting av belgvekstartar dyrka under ulike klimatiske tilhøve i frå Austerrike i sør til Noreg i nord er presentert
Sammendrag
A series of field trials combining cultivars with different levels of resistance to Phythophtora infestans and different haulm killing methods was conducted in 1997, 1998 and 1999 to assess the contamination potential of the haulm. In addition, the frequency of tubers with late blight was assessed after harvest and storage, combining effects of pretreatment infection, infection by the haulm at harvest and the development of the disease during storage. Haulm killing was performed by diquat (200, 400, 600 g a.i. ha-1), half cutting of the haulm in combination with diquat (100, 200, 300 g a.i. ha-1) or full cutting of the haulm. In those treatments where haulm killing was performed purely chemically the haulm remnants" contamination potential tended to increase at reduced doses. Full mechanical destruction gave as low a contamination potential as application of the full dose of chemical haulm killer. However, there were no consistent differences between the haulm killing treatments in the frequency of blighted tubers after harvest and storage. This indicates that the input of chemical haulm killers may be reduced. There was a large difference between years in tuber blight after harvest and storage, which confirms that climatic factors are of major importance for tuber infection. The large difference found between the cultivars in the frequency of tuber blight indicates that tuber resistance should be an important part of integrated late blight disease management.
Sammendrag
Virkning av fruktorden, polyetylenmulch og tidlig driving på biokjemiske komponenter ble undersøkt i jorbærsorten Korona,
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Foreløpige resultater på effekt av plantestørrelse og herdingsforhold på frosttoleranse i kveke, åkertistel og åkerdylle ble presentert
Sammendrag
Foreløpige resultater på effekt av plantestørrelse og herdingsforhold på frosttoleranse i kveke, åkertistel og åkerdylle ble presentert
Forfattere
Hans OvergaardSammendrag
Knowledge of factors that influence oviposition behavior of malaria mosquitoes is critical to vector control measures aimed at larval habitat modifications and source reduction. Anopheles minimus s.l., an important malaria vector in Southeast Asia, generally breeds in clear, unpolluted water along shaded grassy edges of slow-moving streams. The objective of this study was to determine the influence of vegetation and plant structure on An. minimus s.l. ovipositing females. Twenty gravid female mosquitoes per replication were given a choice to lay eggs in bowls surrounded by different combinations of bare soil, grasses, small-leaved plants, and large-leaved plants. An. minimus s.l. females generally preferred to lay eggs in bowls with vegetation. A significantly higher number of eggs were found in bowls with small-leaved plants compared to bowls with grasses (P large-leaved plants > grasses > soil. Further studies are needed to determine the possible roles of plant structure and factors such as semiochemicals in the different species of the An. minimus species complex. Knowledge of female oviposition behavior is essential for the development of locally adapted approaches to source reduction and breeding site interventions.
Sammendrag
Foreløpige resultater på effekt av økning i temperatur og/eller CO2, samt skygging på etterfølgende gjenvekst ved 5-14 "C av kvekejordstengler og røtter av åkerdylle og åkertistel ble presentert.
Sammendrag
Foreløping resultater på effekt av klimaendring på etterfølgende gjenvekst av kvekejordstengler, røtter av åkertistel og åkerdylle ble presentert.
Forfattere
Trygve S. Aamlid Peter LandschootSammendrag
Spent mushroom substrate (SMS) is used by the turf industry in the northeastern United States for soil improvement. When tilled into soil at high rates, some turfgrass managers claim that SMS inhibits turf seed germination. Our objectives were 1) to determine if fresh SMS inhibits turf seed germination and, if so, which species are most adversely affected; 2) to evaluate whether any inhibition caused by SMS is due to osmotic effects or toxicity of compounds in SMS extracts; 3) to determine if any negative effect of SMS on germination can be eliminated by leaching the SMS-amended soil before seeding; and 4) to assess the performance of SMS on seedling emergence in the field. Germination of nine turfgrass species was evaluated in mixtures made from fresh SMS [electrical conductivity of saturated paste extract (ECe) = 11.9 dS m-1] and a loamy sand soil. Germination inhibition due to SMS was most pronounced in the following order: Colonial bentgrass (Agrostis capillaris L.) > sheep fescue (Festuca ovina L. ssp. hirtula [Hackel ex Travis] Wilkinson) > Kentucky bluegrass (Poa pratensis L.) > hard fescue (Festuca trachyphylla [Hackel] Krajina]) > creeping bentgrass (Agrostis stolonifera L.) > Chewings fescue (Festuca rubra L. sp. commutata [Thuill.] Nyman) = strong creeping red fescue (Festuca rubra L. ssp. rubra Gaud.) > slender creeping red fescue (Festuca rubra L. sp. litoralis [Meyer] Auquier) > perennial ryegrass (Lolium perenne L.). SMS had a stronger negative effect on germination rates (GRs) than on final germination percentages (FGPs). Germination of perennial ryegrass and Kentucky bluegrass on blotter paper moisted with SMS-extracts or polyethylene glycol of equivalent osmotic potentials showed that the inhibition was primarily due to osmotic effects. In an experiment with a 50% soil / 50% SMS (v/v) mixture, Kentucky bluegrass germinated better in pots that had been watered with 133 or 167% of the evaporation rate for ten days prior to seeding than in unleached pots. Although the negative effect of SMS on seed germination was not confirmed in a field study where ECe values never exceeded 4.1 dS m-1, we conclude that incorporation of high rates of SMS represents a potential problem for turfgrass establishment.