Soil properties affecting pesticide leaching - application in groundwater vulnerability mapping in the Czech Republic

摘要

Various pesticide and soil properties affect pesticide leaching into groundwater. In order to assess the risk of pesticide leaching, specific groundwater vulnerability maps were constructed for selected pesticides based on modified DRASTIC methodologywith emphasis on soil cover that plays a key role in pesticide leaching due to adsorption of pesticides on soil particles. The Freundlich equation was used to fit experimental data points of the adsorption isotherms for each pesticide and soil using theaverage n parameter for each pesticide. The multiple linear regressions were used to define pedotransfer rules for the determination of the K_F parameter from the other physical and chemical soil properties. Resulting pedotransfer rules, the soil map ofthe Czech Republic and the Czech soil information system PUGIS were applied for the estimation of the adsorption properties of soils of the Czech Republic. The adsorption parameters K_F represents only one soil factor affecting the contaminant transportthrough the soil cover. The properties of selected pesticides represent wide range of used pesticides from those with none leaching potential to those with very good leaching potential. Specific groundwater vulnerability maps reflect those properties.