Indiana Pesticide Applicator Core Practice Exam

What is the term for the movement of water over the land surface away from the target area?

1. Vapor drift

2. Runoff

3. Leaching

4. Spray drift

The correct answer is: Runoff

The term for the movement of water over the land surface away from the target area is runoff. Runoff occurs when precipitation falls to the ground and flows across the land, often carrying with it soil, nutrients, and potentially pesticides, into surrounding areas. This is especially significant in agricultural practices, where the management of water movement can affect both crop health and environmental safety. Other terms provided relate to different processes; for instance, vapor drift refers to the movement of pesticides or other chemicals in vapor form through the air, often due to temperature and wind conditions. Leaching involves the downward movement of dissolved substances through the soil, typically as water percolates downwards, which can lead to contamination of groundwater. Spray drift is the movement of pesticide droplets through the air during application, which can lead to unintended deposition on non-target areas. Understanding these terms helps in managing pesticide application and mitigating environmental impact.