What determines overlap for a boom sprayer? (2)

• A. Wind speed, temperature
• B. Nozzle spacing, spray height
• C. Tank mix ratio
• D. Boom width overlap

Answer: (B)

Overlap for a boom sprayer is determined by how the spray from each nozzle covers the target, which mainly depends on nozzle spacing and spray height. If nozzles are spaced far apart, the swaths land farther apart and gaps can occur unless you adjust height or rate; lowering the spray height makes the individual spray patterns land closer together, increasing overlap, while raising height reduces overlap and increases drift. Wind speed and temperature affect drift and volatilization, not the geometric overlap of the spray patterns. Tank mix ratio changes the amount of chemical applied, not how the spray zones meet. Boom width by itself doesn’t set overlap; overlap comes from adjusting nozzle spacing and spray height to achieve even coverage.