Which factor affects pesticide movement?

• A. Wind speed affects movement
• B. Soil type affects pesticide movement
• C. Pesticide color affects movement
• D. Temperature affects movement

Answer: (B)

Pesticide movement is governed mainly by how the chemical interacts with soil and water, which is determined by soil properties. The soil type sets texture and organic matter content, influencing porosity and how strongly the pesticide sorbs to soil particles. In soils with high clay or organic matter, pesticides tend to bind more, slowing or limiting vertical movement and leaching. In sandy, low-organic-matter soils, there’s less sorption and larger pore spaces, so the chemical can move more readily with infiltrating water, increasing mobility. So, the soil type is the primary factor that decides whether a pesticide stays near the surface, moves downward, or risks reaching groundwater. While wind speed affects how a pesticide is dispersed during application and temperature can affect volatilization and degradation, these factors don’t determine movement through the soil as directly as soil type does. Pesticide color has no impact on its physical movement.