Which product must you apply with a calibrated sprayer, given that it requires a set amount per 1,000 square feet?

• A. Herbicide A
• B. Herbicide B
• C. Neither; both can be calibrated with a fixed volume
• D. Both; calibration is optional

Answer: (B)

When a label requires a set amount per 1,000 square feet, you must use a calibrated sprayer because the dose is tied to the area being treated. A calibrated system delivers a known amount of product for each measured area, so as you move across the turf or beds you hit the exact rate specified, regardless of pace, nozzle type, or pressure. Herbicide B has this per-area rate requirement, so calibration is essential to apply the correct amount. Relying on a fixed-volume approach wouldn’t guarantee the right per-area dose and could lead to under- or over-application, or risk plant injury. Calibration is not optional here, and ideas that both products can be applied with a fixed volume or that calibration isn’t necessary wouldn’t reliably meet the label’s per-area specification.