title: Impact of soil water regime on degradation and plant uptake behaviour of the herbicide isoproturon in different soil types.
abstract: The environmental fate of the worldwide used herbicide isoproturon was studied in four different, undisturbed lysimeters in the temperate zone of Middle Europe. To exclude climatic effects due to location, soils were collected at different regions in southern Germany and analyzed at a lysimeter station under identical environmental conditions. (14)C-isoproturon mineralization varied between 2.59% and 57.95% in the different soils. Barley plants grown on these lysimeters accumulated (14)C-pesticide residues from soil in partially high amounts and emitted (14)CO(2) in an extent between 2.01% and 13.65% of the applied (14)C-pesticide. Plant uptake and (14)CO(2) emissions from plants were inversely linked to the mineralization of the pesticide in the various soils: High isoproturon mineralization in soil resulted in low plant uptake whereas low isoproturon mineralization in soil resulted in high uptake of isoproturon residues in crop plants and high (14)CO(2) emission from plant surfaces. The soil water regime was identified as an essential factor that regulates degradation and plant uptake of isoproturon whereby the intensity of the impact of this factor is strongly dependent on the soil type.
authors.affiliation: Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Institute of Soil Ecology, 85764 Neuherberg, Germany.
authors.forename: Sabine
authors.initials: S
authors.lastname: Grundmann
authors.forename: Ulrike
authors.initials: U
authors.lastname: Doerfler
authors.forename: Jean Charles
authors.initials: JC
authors.lastname: Munch
authors.forename: Bernhard
authors.initials: B
authors.lastname: Ruth
authors.forename: Reiner
authors.initials: R
authors.lastname: Schroll
mesh_terms: D001673:Biodegradation, Environmental; D005618:Fresh Water / Q000737:chemistry; D006540:Herbicides / Q000737:chemistry / Q000378:metabolism*; D010671:Phenylurea Compounds / Q000737:chemistry / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism*
chemical_list: D006540:Herbicides; D010671:Phenylurea Compounds; D012987:Soil; D012989:Soil Pollutants; C028904:isoproturon