Abstract
AbstractA laboratory apparatus was constructed to study the leaching behavior of soil‐applied herbicides in disturbed and undisturbed soil columns under vadose zone conditions. The setup was built in such a manner that a broad variety of field conditions regarding rainfall characteristics and soil water tension could be simulated. Long‐term transport experiments up to 3 mo required an automatic withdrawal of the soil percolate and a continuous control and recording of the soil water tension, the applied vacuum, and the amount of precipitation. During the sampling of the leachate, a newly designed lock guaranteed a constant vacuum at the bottom end of the soil column. First experiments with the new apparatus showed an earlier break‐through of terbuthylazine (2‐chloro‐4‐ethylamino‐6‐terbuthylamino‐s‐triazine) and a larger solute dispersion under transient water flow than under steady‐state water flow in a sandy soil.
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