What is "deep-water injection" in the context of herbicide application?

Deep-water injection refers to a technique used in herbicide application where the herbicide mixture is released deep within the water column, rather than being applied at the surface or at shallow depths. This method is particularly effective for targeting aquatic vegetation that is located below the water's surface, such as submerged plants that may not be effectively controlled by surface applications. By injecting the herbicide deeply, it allows for better dispersion and uptake by the targeted plants, thereby enhancing the effectiveness of the treatment while minimizing the impact on non-target species that might be present at the surface. This method is also beneficial in areas where surface applications may lead to greater volatility or degradation of the herbicide due to environmental conditions.