The movement of C-14-benazolin and bromide in large zero-tension outdoor lysimeters and the undisturbed field

The leaching behavior of C-14-labeled benazolin and bromide in suction-free lysimeters of 0.8 m(2) surface area was compared with a suction base syste m of the same size that was very close to the undisturbed field. Difference s were found in the outflow of leachate and bromide which could be explaine d by the different climatic boundary conditions at the two experimental sit es. The outflow of C-14-activity and benazolin was almost identical with th e two systems, whereas large variabilities in the replicates were found wit hin the systems. Parts of the herbicide and the conservative tracer simulta neously reached the sampling depth in 1.3 m. No differences were found betw een the bromide transport of the undisturbed field and the suction plots.