Abstract
The purpose of this work was to verify whether facilitated transport enhances the vertical movement of a relatively strongly adsorbing pesticide, and to study whether ionic strength and pH affects the pesticide and particle transport. Experiments were carried out with 20*20 cm undisturbed soil columns taken from the topsoil (sandy loam, typic Hapludalf) from a field under normal cultivation near Røgen, Denmark. The selected pesticide, prochloraz, was applied to the surface as a pulse in solution. Facilitated transport was significant, but was not dominating the transport of the pesticide: about 10% of the pesticide was bound to particles with diameter d > 0.24 μm. Preferential flow and particle transport were the two most important factors determining the amount of pesticide leached. Decreasing ionic strength and increasing pH promoted leaching of particles and pesticide.
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