After calibrating a sprayer, what is the purpose of a field check?

• A. To confirm the sprayed volume per area in the field matches the label rate.
• B. To adjust the sprayer’s pump pressure to manufacturer specs.
• C. To verify that the actual application rate in the field matches the label rate.
• D. To determine the color of the spray.

Answer: (C)

The field check is about confirming the actual application rate in the field matches the label rate. Calibration tells you how much chemical you should be delivering under controlled conditions, but field conditions—such as travel speed, nozzle wear, pressure variations, and weather—can change what you actually apply. By measuring the spray over a known area (often with catch cans) and calculating gallons per acre, you verify that the field rate aligns with the label. If it doesn’t, you adjust equipment or operation to bring the rate back to the label specification, ensuring proper efficacy and label compliance.