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2006

Sammendrag

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.