ABSTRACT
The penetration of pesticides into the groundwater is influenced by a series of factors. In this process, the physicochemical properties of the compounds used as well as their mobility and persistence play a decisive role. In addition, the practice of application used in agriculture, i.e., frequency and date of application, the quantity used, and the technique of application are of importance. The sites for the field studies had to meet three requirements they are. The pesticides selected should be applied intensively and on an area which is as large as possible. They should include permeable soils with varying contents of organic carbon. They should show a low depth of groundwater level. In the field studies, water samples were taken from tubes directly below the treated surfaces from different depths and examined for the active agents applied.
