title: Pesticide leaching through sandy and loamy fields - long-term lessons learnt from the Danish Pesticide Leaching Assessment Programme.
abstract: The European Union authorization procedure for pesticides includes an assessment of the leaching risk posed by pesticides and their degradation products (DP) with the aim of avoiding any unacceptable influence on groundwater. Twelve-year's results of the Danish Pesticide Leaching Assessment Programme reveal shortcomings to the procedure by having assessed leaching into groundwater of 43 pesticides applied in accordance with current regulations on agricultural fields, and 47 of their DP. Three types of leaching scenario were not fully captured by the procedure: long-term leaching of DP of pesticides applied on potato crops cultivated in sand, leaching of strongly sorbing pesticides after autumn application on loam, and leaching of various pesticides and their DP following early summer application on loam. Rapid preferential transport that bypasses the retardation of the plow layer primarily in autumn, but also during early summer, seems to dominate leaching in a number of those scenarios.
authors.affiliation: Geological Survey of Denmark and Greenland, Department of Geochemistry, Øster Voldgade 10, DK-1350 Copenhagen, Denmark. Electronic address: aer@geus.dk.
authors.forename: Annette E
authors.initials: AE
authors.lastname: Rosenbom
authors.affiliation: Aarhus University, Department of Agroecology, Blichers Allé 20, DK-8830 Tjele, Denmark.
authors.forename: Preben
authors.initials: P
authors.lastname: Olsen
authors.affiliation: Aarhus University, Department of Agroecology, Blichers Allé 20, DK-8830 Tjele, Denmark.
authors.forename: Finn
authors.initials: F
authors.lastname: Plauborg
authors.affiliation: Aarhus University, Department of Bioscience, Vejlesøvej 25, DK-8600 Silkeborg, Denmark.
authors.forename: Ruth
authors.initials: R
authors.lastname: Grant
authors.affiliation: Geological Survey of Denmark and Greenland, Department of Geochemistry, Øster Voldgade 10, DK-1350 Copenhagen, Denmark.
authors.forename: René K
authors.initials: RK
authors.lastname: Juhler
authors.affiliation: Geological Survey of Denmark and Greenland, Department of Geochemistry, Øster Voldgade 10, DK-1350 Copenhagen, Denmark.
authors.forename: Walter
authors.initials: W
authors.lastname: Brüsch
authors.affiliation: Geological Survey of Denmark and Greenland, Department of Geochemistry, Øster Voldgade 10, DK-1350 Copenhagen, Denmark; Novozymes A/S, Krogshoejvej 36, DK-2880 Bagsvaerd, Denmark.
authors.forename: Jeanne
authors.initials: J
authors.lastname: Kjær
mesh_terms: D018556:Crops, Agricultural; D003718:Denmark; D004784:Environmental Monitoring; D060587:Groundwater / Q000737:chemistry*; D006801:Humans; D010575:Pesticides / Q000032:analysis*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical
keywords: Agricultural soils; Early warning monitoring program; Field scale; Pesticide leaching; Risk assessment