During airblast calibration, what should be sprayed on the calibration plot?

• A. The calibration plot previously selected and measured
• B. The entire field
• C. Only a random area
• D. The adjacent plot

Answer: (A)

Calibrating an airblast sprayer relies on having a known reference area to anchor the measurements. Spraying the calibration plot that you have previously selected and measured provides a precise, defined area with known dimensions and baseline data. This lets you link the spray deposited on that plot to a specific rate and operating setting, so you can accurately translate what you see into correct application rates for the whole field. Spraying the entire field would erase that reference and make it impossible to determine how much spray corresponds to a given setting. Using only a random area or an adjacent plot introduces unknowns and mismatches in area, target, and conditions, which undermines the calibration.