After completing spraying the calibration plot, what should you do at the filling site?

• A. Determine the rate by dividing gallons of water by area sprayed
• B. Return to the filling site and accurately measure the amount of water needed to refill the tank to the previous level
• C. Refill tank with pesticide
• D. Allow the tank to drain and measure leftover water

Answer: (B)

After finishing the calibration plot, you should return to the filling site and accurately measure the amount of water needed to refill the tank to the level used during calibration. This keeps the tank’s dilution consistent with what you used to calibrate, so the spray rate and application remain accurate in the field. It also avoids introducing new concentrations or wasting product.