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Laboratory Method for Studying Pesticide Dissipation in the Vadose Zone

Ecosystem Research Center, Bornhoeved Lakes Region, Schauenburger Str. 112, 2300 Kiel, Germany

Bernd Lennartz

Institute for Water Management and Landscape Ecology, Olshausenstr. 40, Christian-Albrechts-Univ., 2300 Kiel, Germany

*Corresponding author.

ABSTRACT

A 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.

Received for publication October 30, 1992.