When applying pesticide sprays, we need to carefully calibrate the tractor mounted sprayer to deliver the exact amount of liquid per minute to ensure proper spray coverage. Typically, you can adjust the sprayer to deliver a required volume of liquid per minute. We use the following formula to calculate the outflow amount (in GPM gallons per minute) of nozzle bank (manifold) to achieve desired gallons of spray per acre (gpa).
Desired ground speed (MPH) = 2 mph
Let's calculate GPM = (100 x 2 x 22) / 1000 = 4.4
So this means, we need to set the nozzle to deliver 4.4 gallons per minute from one side to achieve 100 gpa at 2mph speed as required.
GPM = (GPA x MPH x Row Spacing) / 1000
Example:
Row Spacing (trunk to trunk distance) = 22 feet
Gallons of spray per acre (GPA) = 100 [as recommended by pest control adviser]Desired ground speed (MPH) = 2 mph
Let's calculate GPM = (100 x 2 x 22) / 1000 = 4.4
So this means, we need to set the nozzle to deliver 4.4 gallons per minute from one side to achieve 100 gpa at 2mph speed as required.
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