What practices help prevent drift during application?

• A. Apply only at dawn with no regard to wind.
• B. Use appropriate nozzle types and droplet sizes, apply under suitable wind conditions, maintain proper boom height, and avoid inversions or high-temperature conditions.
• C. Increase boom height beyond practical reach.
• D. Use the smallest droplet size regardless of wind.

Answer: (B)

Preventing drift comes down to controlling how and where the spray moves in the air. Choosing the right nozzle types and larger droplet sizes reduces the number of tiny droplets that can be carried off-target by wind. Using a nozzle and droplet size that hit the target with adequate coverage helps balance effectiveness with drift reduction.

Wind conditions matter because air movement carries droplets. Applying under moderate, steady wind helps push droplets toward the crop rather than letting them linger and drift away, while avoiding very calm air or gusty, erratic winds minimizes off-target movement.

Boom height is also crucial. Keeping the spray at the proper height—not too high—limits how far droplets can travel before reaching the target and reduces drift potential.

Inversions and high-temperature conditions create environments where spray droplets stay suspended near the ground or evaporate into finer aerosols, both of which increase drift risk. Avoid spraying when inversions are present or when conditions are excessively hot and dry.

So the best practices combine appropriate nozzle choices and droplet sizes, suitable wind conditions, correct boom height, and avoidance of inversions or high-temperature situations.