What term describes the downward movement of pesticides in the soil?

The term that describes the downward movement of pesticides in the soil is leaching. This process occurs when rainwater or irrigation water moves through the soil layers, carrying dissolved pesticides along with it. Leaching is particularly significant in terms of environmental impact, as it can lead to the contamination of groundwater and nearby water bodies if pesticides reach those depths or are carried away from the target area.

Understanding leaching is crucial for professionals responsible for applying herbicides because it influences not only the effectiveness of the pesticide application but also the potential risks associated with water quality and ecosystem health. Being aware of how specific soil types, moisture levels, and rainfall can impact leaching helps in making informed choices about herbicide selection and application timing to minimize unintended environmental consequences.