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.
2006
Forfattere
Marit AlmvikSammendrag
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Sammendrag
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Forfattere
Jeanne Perceval Pierre Benoit Marianne Stenrød Ole Martin Eklo Marie-Paule Charnay Enrique BarriusoSammendrag
Metribuzin is commonly used in Norway for weed control in potato crop in rotation with spring barley production. Under temperate climatic conditions, metribuzin dissipation has been widely studied, but in nordic environment data are needed to assess quantitatively the dissipation fate and the risk of leaching. Laboratory incubation studies were conducted at 5, 15 and 28"C to evaluate the influence of temperature on the mineralization of metribuzin in two sandy loam soils sampled in southern and northern Norway and under a temperate climate in France for comparison purposes. Using 14C-labelled metribuzin, mineralization and the evolution of 14C-residues in soil could be observed during an incubation period of 49 days. Total metribuzin mineralization and organic carbon mineralization rates showed a positive temperature response in all soils. Metribuzin mineralization was low, but degradation products were formed and their abundance depended on temperature conditions. Investigation of soil microbial characteristics such as microbial biomass and general microbial activity indicated differences in the composition of the soil microbial population. The evolution of available 14C-metribuzin residues with time gave evidence of a strong temperature effect indicating that in such soils where sorption is weak, biodegradation processes have a major control on metribuzin mobility and persistence.
Sammendrag
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Forfattere
Marianne StenrødSammendrag
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Forfattere
Marianne StenrødSammendrag
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Sammendrag
The aim of this study was to investigate the possible influence of surface topographical features on the spatial variability of glyphosate degradation and some microbial characteristics in sandy loam soil. Soil samples were taken from the ploughed layer across an agricultural field after seedbed preparation for grain (Grue site), and down to 1 m depth under a ridge tilled field (Målselv site), both sites having similar soil textural characteristics (sandy loam soil). Laboratory experiments were performed looking at glyphosate mineralization and soil microbial activity at the Grue site, as well as microbial biomass, activity and substrate utilization patterns at the Målselv site. Microbial biomass and activity decreased, and substrate utilization patterns changed with increasing soil depth, reflecting naturally occurring changes in quantity and quality of soil organic carbon. Further, our results show that considerable spatial heterogeneity in the degradation rate of glyphosate and general carbon utilization exists even across small areas within a single agricultural field. This horizontal variability was observed over several spatial scales, and could not be clearly explained. It evidently arose from differences in environmental factors affecting microbial activity and growth, and topographical features controlling redistribution of water and matter flow patterns were correlated to the investigated soil microbial variables.
Sammendrag
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Forfattere
Inger Sundheim Fløistad Marit Helgheim Jan Netland Joralv Saur Kirsten Tørresen Kjell Wærnhus Agnethe ChristiansenSammendrag
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2005
Forfattere
Marit Almvik Ole Martin Eklo Randi Bolli Marianne Stenrød Jens Kværner Tore Einar Sveistrup Espen HauglandSammendrag
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