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.
2005
Forfattere
Ellen Johanne Svalheim Publikasjonsforfatter Petter Marum Leif Hauge Jørgen UelandSammendrag
Det genetiske mangfoldet i eng- og beiteplanter har vært og er fortsatt en viktigressurs for utvikling av norsk landbruk. Endringer i landbruksdrift fører til at biotoperfor gras og kløver forsvinner med tap av genetisk variasjon som resultat. Norsk genressurssenter arbeider med ulike tiltak for å bevare og utnytte disse ressursene.Denne håndboken henvender seg hovedsakelig til de som jobber med arealplanleggingog forvaltning innen landbruk og miljø på fylkes- og kommunenivå,samt til feltkartleggere og biologer. Den beskriver viktigheten av å ta vare på lokaltilpassetgenetisk materiale hos våre fôrarter innen gras- og kløver. Håndboken skalgi hjelp til å finne fram til verdifulle enger og råd om hvordan de kan bevares forframtiden.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Varslene i VIPS for bladflekksjukdommer i høsthvete var i de fleste tilfelle i godt samsvar med registrert lønnsomhet for bekjempelse i forsøkene. Varslene kom litt for seint i 2008 i for tidlig sådd vårhvete. For vårhvete sådd i mai var varslene i samsvar med forsøksresultatene.Bioforsk-konferansen 2009
Forfattere
Matthias KoeslingSammendrag
In many European countries there has been a substantial increase in the use of nitrogen fertiliser from 1950 to the 80?s. For most of the countries studied, lower prices for wheat in the late 80"s, as an indicator for agricultural plant product prices, leaded to less application of nitrogen fertiliser, presumable because the application was less profitable.
Forfattere
Anne Falk Øgaard Tore KrogstadSammendrag
To avoid over-fertilization of potassium (K) and thereby a mineral composition in the grass crop not optimal for animal health, estimation of K release from soil is important. The analytical methods should therefore predict the total K release from soil. Furthermore, to minimize costs for the farmers they should provide information which remains valid over a period of several years. The relationship between different soil extraction procedures for K and K uptake in ley for three subsequent years after soil sampling was studied in 19 field experiments on a range of mineral soil types in Norway. Potassium determined with solutions that extracted exchangeable K or parts of exchangeable K (0.01 M CaCl2, 0.5 M NaHCO3, 1 M NH4oAc or ammonium acetate lactate) was significantly (p
Forfattere
Anne Falk Øgaard Tore KrogstadSammendrag
Potassium (K) release from sources that are not initially exchangeable is attributed to depletion of interlayer K of micas and clay minerals or weathering of feldspars. The aim of the present study was to estimate the K release from interlayer K. Soil samples from 17 field experiments in ley on a range of mineral soils in Norway were used in the study. The change in K fixation capacity was used as an estimate of depletion of interlayer K. It was assumed that the increase in K fixation capacity during three years of cropping was equivalent to the amount of K depleted from the interlayer positions. Mean K fixation increased in the majority of the soils during three years of grass cropping both with and without K application. The increase in K fixation indicated that without K application the K uptake from interlayer K amounted to 43, 28 and 26% of the K yield for clay soils, high K sandy soils and low K sandy soils, respectively. Including K uptake from exchangeable K in the topsoil and from subsoil, the explained K uptake amounted to 79, 69 and 81% for the three groups of soil, respectively. Simple linear regression analyses showed that the change in K fixation during three years of grass cropping was best explained by the percentage of clay in the soil.
Forfattere
Tor J. JohansenSammendrag
Studies have focused on the progress of diapause and post-diapause development in one early- and one late-emerging population of D. floralis at various temperatures. For the early emerging biotype, diapause progressed gradually at low temperatures and terminated in late spring. For the late emerging biotype also, diapause progressed gradually for a certain period, but did not end, no matter the duration of chilling. For both populations, diapause developed faster at constant 18 ºC compared to combinations with chilling periods, implicating that chilling was not a prerequisite for diapause development. For the late emerging population, results indicated a second phase of diapause development with a threshold temperature of about 7 "C. However, the rate of this second phase development did not increase linearly with temperatures but had an optimum at about 12 "C. Post-diapause development for both populations was similar and had a lower threshold of about 2 "C. Results explain how delayed emergence in some populations are regulated.
Forfattere
Rolf NestbySammendrag
Dette er et spesialnummer med 12 artikler som dekker forsøk påbær og trefrukt (hovedsakelig jordbær) gjennomført av den europeiske COST aksjonen 836. Det sammenstiller noe av de aktivitetene som er utviklet av arbeidsgruppene 3 og 4, henholdsvis med fokus på fysiologi og ernæring.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Many different species of microorganisms have one or more hydrogenase enzymes that reduce protons to molecular hydrogen under certain conditions. Upon sulfur deprivation, green algae can produce relatively large amounts of hydrogen in a sustainable process. The majority of research in this field has focused on Chlamydomonas reinhardtii, but other species of green algae are also able to produce hydrogen under sulfur deprivation. Using PCR reactions, we examined the presence of hydrogenase genes in marine and fresh water species of green algae that were able to produce hydrogen under sulfur deprived conditions. Primers were designed from conserved regions of the sequence of the two hydrogenase genes in C. reinhardtii, and used to screen for the presence of similar gene sequences in other species. PCR products that were sequenced suggest that genes for hydrogenase are present in C. noctigama and other species. Similarities and differences in the sequences of hydrogenase genes between C. reinhardtii and other species, will be presented.