Two types of rates used in sprayer calibration and tank mixing

• A. Flow rate per nozzle; Application speed; Effective sprayed width per nozzle
• B. GPM & MPH
• C. Spray application rate & Formulation rate
• D. GPA & W

Answer: (C)

Two essential rates you manage in sprayer calibration and tank mixing are the spray application rate and the formulation rate.

The spray application rate is how much spray material is delivered to the ground per unit area (usually gallons per acre). This is governed by nozzle flow, travel speed, and nozzle spacing, and it defines how much total spray you apply to the target area. Getting this right ensures effective control while minimizing waste and drift risk.

The formulation rate is how concentrated the spray mix is with active ingredient—how much product is in each gallon of water (or how much product per acre overall). This is set during mixing by calculating how much product to add to the tank so that, when applied at the chosen spray rate, the label rate per acre is met. In practice you determine the total product needed per acre from the spray volume per acre and the label rate, then translate that to the amount of product to add per gallon of mix.

Together, these rates let you calibrate how much liquid you apply and how concentrated that liquid is, ensuring correct delivery of the pesticide according to the label.