Boom height is measured by reference to what distance in relation to the nozzle?

• A. The ground to the nozzle
• B. The middle of the spray pattern to the nozzle
• C. The bottom of the target to the nozzle
• D. The top of the target to the nozzle

Answer: (D)

Boom height is the vertical distance from the nozzle to the top of the crop canopy. Measuring to the top of the target ensures the spray plume intercepts the upper leaf surface where most interception occurs, providing more uniform coverage and reducing off-target drift. Measuring to the ground, the middle of the spray pattern, or the bottom of the target can misalign the spray with the part of the plant that needs protection and increase drift or uneven deposition.