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SPRAYER CALIBRATIONS AND CALCULATIONS

APPENDIX K CALIBRATIONS , CALCULATIONS , & CONVERSIONS SPRAYER CALIBRATIONS AND CALCULATIONS1 TABLE K - 1. SPRAYER CALIBRATIONS AND CALCULATIONS Calculation Example Formula 1. Determining the Gallon per Minute (GPM) required of nozzles to achieve a given Gallon per Acre (GPA) Example 1 You want an output of 20 GPA. Your nozzles are 20 feet apart. Your field speed is 5 MPH. How much do you need to collect from each nozzle to achieve 20 GPA? 20 GPA x 5 MPH x 20 = 2000 5940 5940 = GPM per nozzle Example 1a - Convert Gallons per Minute (GPM) to Ounces per Minute (OPM) From Example 1 you have collected GPM from each nozzle. x 128 = 43 OPM per nozzle Example 1b - Convert OPM to GPM You have collected 43 OPM from each nozzle.

Spray the calibration plot uniformly with water, noting the number of seconds required: Time Required to spray plot = _____ seconds. Step 3 Spray into a bucket for same number of seconds. Step 4 Measure the number of ounces of water in the bucket: Volume sprayed = _____ ounces Step 5. (GPA)

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