Reeves Petroff Pesticide Education Specialist MSU Extension http

• Reeves Petroff • Pesticide Education Specialist • MSU Extension • http: /mtpesticides. org Calibration and Mixing

* Calibration * * * Terms – Steps taken to determine output or delivery rate of sprayer Delivery or Application Rate – Gallons of liquid that is applied, usually per acre. A. k. a. - sprayer output – sprayer volume, application volume Diluent –material used to dilute pesticide concentration at time of application – water Dose -A. k. a rate or labeled rate. Amount of pesticide to apply – per acre Field Speed or travel speed - MPH at which application takes place GPA -Gallons Per Acre – sprayer output – spray volume

Application = Spraying • Types of Applications – Broadcast – Spot • Application Volume – GPA • Pesticide Rate • Acres to spray • How much to add to the tank

One Acre 43, 560 ft 2 Test strip

G Gallons applied to test strip A Acres in Test Strip = G Gallons A Acre

CALIBRATION TEST STRIP METHOD Set up a test strip (L x W) = ft 2 • How much liquid (oz. ) is applied per strip? – Single & multiple nozzles

Oz. applied to test strip Test Strip ft 2 = GPA X 340

Test strip = 15 feet x 15 feet Volume applied = 32 ounces 225 ft 2 x 340 0. 142 x 340 = 48. 3 or 48 GPA =

Find Acres Volume GPA 300 gallons 30 GPA = 10 acres How much to add to the tank Acres x rate 10 Acres x 1 pint per acre 10 pints