What is the purpose of spin-up and calibration check prior to application?

• A. To check nozzle color
• B. To measure wind speed
• C. To ensure sprayer delivers the correct rate per acre and functioning properly
• D. To calibrate the pesticide storage container

Answer: (C)

The main idea is to ensure the sprayer will deliver the right amount of chemical per acre and that the system is working correctly before you apply. Spin-up brings the pump and sprayer into operation, letting you check for steady flow, stable pressure, leaks, or clogged nozzles at the actual operating conditions. Calibration converts the target rate per acre into real output by considering your travel speed, nozzle flow, and pressure, so you know you’re applying the labeled amount. Together, these checks prevent under- or over-application, protect crops and the environment, and keep you compliant with the label. The other options don’t address application rate or equipment performance: nozzle color isn’t about rate, wind speed is a drift factor handled separately, and storage container calibration isn’t related to spray delivery.