This study investigates the downslope movement and processes of the herbicide hexazinone within the SBS Zone, a critical area for forestry operations. The research details a trial conducted near Smithers, BC, examining three application rates and two application timings across two distinct soil types to understand the herbicide's behavior. The methodology involved applying hexazinone to the top 100m of soil and monitoring its movement over the subsequent 40m using surface and subsurface soil water collection troughs at 7, 15, and 25m intervals. Additionally, the study utilized hexazinone-sensitive plants, such as rose and aspen, as biological indicators to map the extent of the herbicide's downslope dispersion.

This technical report details a specific environmental study on herbicide movement in a forestry context. The methodology described suggests a focused, empirical approach to understanding soil and water contamination. The findings are likely to be of interest to environmental scientists, forest managers, and regulatory bodies concerned with pesticide application and its ecological impact.