STEP 2 The boom sprayer traveled 176 feet in 46 

 seconds In the first pass and 50 seconds in the 

 return pass. 



SPEED (MPH) = DISTANCE in FEET X 60 SECONDS 



AVERAGE TIME in SECONDS X 88 FEET 



MPH = 176 X60 = 10569 = 2.5 MPH 

 48 X 88 4224 



STEP 3A. The nozzle tips average 52 ounces per 

 minute (OPM) at a selected pressure of 40 psi. 



GALLON PER MINUTE (GPM) = OUNCES per MINUTE (QPMI 



128 OUNCES per GALLON) 



GPM = 52 = 406 GPM 

 128 



STEP 3B Calculate the delivery of the sprayer to 

 gallons per acre (GPA) if the nozzle spacing on 

 the boom is 24 inches (effective spray pattern for 

 each tip). 



GALLON PER ACRE (GPA) = GPM X 5940 



MPH X NOZZLE SPACING 

 i'« inches 



GPA = .06 X 5940 = 2412 

 2 5 X 24 60 



40.2 GPA 



THE RESULT The sprayer output is 40.2 gallons of 

 water is necessary to cover one acre 



Mix the recommended rate per acre of pesti- 

 cide product to 40.2 gallons of water for each acre 

 to be treated. 



IN SUMMARY 



Calibrating the sprayer is the first step in control- 

 ling pesticide application. With proper and accu- 

 rate sprayer calibration, the operator will apply 

 the appropriate amount of pesticide to control the 

 pest(s) without damaging the target plant, animal, 

 or surface, and will maximize the return on the 

 pesticide investment. 



To do an effective, safe and efficient applica- 

 tion, the equipment must be properly adjusted, 

 calibrated, operated and maintained. Read pesti- 

 cide labels and follow all directions in order to 

 obtain the desired control without harming the 

 environment. ** 



George W. Hamilton is an Extension Educator, Agricultural 

 Resources. UNH Cooperative Extension, in Hillsborough 

 County. His address there is 468 State Route 13 South. 

 Milford. NH 03055: he can be reached at 603-673-2510. 



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 28 



