What does leaching refer to in the context of pesticide application?

Leaching refers to the process by which dissolved substances, including pesticides, are washed out of the soil and percolate down through the soil layers into the groundwater. This phenomenon can happen when rainwater or irrigation water moves through the soil, carrying with it any soluble chemicals present, which can lead to environmental contamination if those chemicals reach the water supply.

Understanding leaching is crucial for pesticide applicators because it emphasizes the importance of application techniques and the timing of applications to minimize the risk of chemicals entering groundwater systems. By recognizing how leaching works, applicators can make informed decisions to protect both the environment and human health while still effectively managing pests.