Drift is defined as which of the following?

Drift is defined as which of the following?

• A. The movement of the chemical and its carrier by wind away from the target
• B. The downward movement into the root zone
• C. The uptake by non-target plants
• D. The evaporation of solvent

Answer: (A)

Drift is the movement of the chemical and its carrier by wind away from the target. When spray droplets are light or small, or when wind is present, the spray can be carried off-target before it deposits where you intend it to act. This off-target movement is what we mean by drift and it explains why nearby crops, non-target vegetation, or surfaces can receive unintended residues, sometimes causing damage.

The other descriptions describe processes that aren’t about air-borne transport. Moving downward into the root zone is leaching, not drift. Non-target plant uptake can happen if drift occurs, but it’s a consequence of drift, not the definition. Evaporation of solvent is a phase change that can alter how a spray behaves, but it isn’t about wind carrying droplets away.

To minimize drift, consider factors like droplet size, nozzle type, application height, and weather conditions, and apply only under conditions that reduce off-target movement.