What does the term "bottom placement" refer to in herbicide application?

The term "bottom placement" in herbicide application specifically refers to a method where the herbicide is applied at or near the bottom of a water body. This technique is particularly useful when targeting aquatic plants that grow on or near the bottom substrate, as it allows the herbicide to be effectively delivered to the areas where these plants are rooted. By focusing the application at the bottom, the herbicide can interact more directly with the targeted weeds, improving its efficacy and potentially reducing the volume needed for the treatment.

Moreover, targeting the bottom of the water body can help minimize the unintended impact on non-target organisms that may reside in the upper water column. This strategic placement ensures that the herbicide is concentrated where it is most needed for controlling rooted aquatic vegetation, thereby enhancing the overall effectiveness of the aquatic weed management program.