When should you calibrate spraying equipment?

• A. Before use
• B. After the first hour of operation
• C. End of day
• D. Before storage

Answer: (A)

Calibrating before use ensures the sprayer delivers the exact chemical amount per area that the label specifies. This check confirms that the nozzle type, pressure, and travel speed will produce the correct gallons per acre, resulting in uniform coverage and preventing under- or over-application. Doing it at the start accounts for the current equipment condition and field conditions, so you’re applying the product as intended from the first pass. Waiting until after you’ve started, or only calibrating at the end of the day or before storage, can allow drift in rate due to changes in pressure, nozzle wear, or product decisions, leading to turf damage, ineffective control, or environmental risk. If you switch products, change nozzles, or adjust conditions, recalibrate before continuing.