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Sprayer Calibration <br /> It is critical to know the output of a sprayer in order to be accurate <br /> in adding an herbicide to the tank. <br /> Handgun <br /> 1. Measure a calibration plot that is exactly 18.5 ft X 18.5 <br /> ft(1281h of an acre). <br /> 2. Spray the plot uniformly with water, keeping the <br /> sprayer pressure constant. Note the number of seconds <br /> required. <br /> 3. Spray into a bucket for the same number of seconds, <br /> again keeping the sprayer pressure constant. <br /> 4. Measure the number of ounces of water in the bucket. <br /> 5. Number of ounces of water measured from the bucket <br /> is equal to the number of gallons per acre (GPA)the <br /> sprayer is delivering. <br /> Spray Amount of Herbicide to Add to Each Gallon of Water <br /> Volume in Ounces <br /> (GPA) <br /> Recommended Herbicide Rate/Acre (from label) <br /> 1 oz 4 oz 7 oz 1 Pint 1 Quart <br /> 15 .067 .268 .469 1 2 <br /> 20 .05 .2 .35 0.83 1.67 <br /> 30 .033 .132 .231 0.5 1 <br /> 40 .025 .1 .175 0.42 0.83 <br /> 50 .02 .08 .14 0.33 0.63 <br /> 2 tablespoons =6 teaspoons = 1 fluid ounce =29.57 milliliters <br /> 8 fluid ounces = 1 cup; 2 cups = 1 pint; 2 pints = 1 quart; <br /> 4 quarts = 1 gallon; 1 gallon = 128 fluid ounces <br /> lounce (dry) =28.35 grams; 16 ounces = 1 pound <br /> 1 acre =43,560 square feet; 1 meter= 3.281 feet <br /> 1 gallon of water= 8.3453 pounds of water <br />