![]() Therefore, put (20 × 12 =) 240 gallons of pesticide and carrier in the tank.Ĭalculate the volume of pesticide to mix in the tank Gallons of spray mixture = application rate (gallons per acre) × area to spray (acres) You want to spray a 12-acre field and your sprayer applies 20 gallons per acre. The correct volume of spray is the sprayer application rate multiplied by the number of acres. The pesticide and carrier (water) are added to the tank until the tank is filled to the correct level. Small fields can be sprayed with partially filled tanks. Your spray tank holds 400 gallons and your sprayer application rate is 20 gallons per acre.Īcres per tank = 400 gallon per tank ÷ 20 gallon per acre = 20 acres per tank The number of acres sprayed by a full tank is found by dividing the tank capacity by the sprayer application rate, which was found during calibrationĪcres per tank = Total tank capacity (galllon per tank) ÷ Application rate (gallons per acre) All references to "tank" in the following material refer to the combined capacity of all tanks. If you use a sprayer with two or more tanks remember to consider the total volume of all tanks and to divide all ingredients proportionally among the tanks. Pints of 2,4-D per acre = 3/8 gallon per acre × 8 pints per gallon = 3 pints per acreĬalculate the number of acres sprayed by a full tank of the spray mixture You may find it useful to convert gallons per acre to pints per acre for measuring purposes. Gallons of 2,4-D per acre = 1.5 pounds per acre ÷ 4 pounds per gallon = 0.375 gallon per acre or 3/8 gallon per acre Suppose you want to apply 1.5 pounds of 2,4-D per acre and the 2,4-D contains 4 pounds of active ingredient per gallon. Gallons of pesticide per acre = application rate (pounds per acre) ÷ concentration or acid equivalent This volume can be found by dividing the pesticide application rate (Step 1) by the number of pounds of active ingredient per gallon (Step 2). However, if the rate is shown as pounds of active ingredient per acre, then it is necessary to calculate the volume of pesticide to apply per acre. If the label gives the pesticide application rate in volume units such as quarts or pints, then the amount was found in Step 1. This amount is normally shown as pounds of active ingredient per gallon (gal).Ĭalculate the volume of pesticide product to apply per acre The label will show the amount of active ingredient in each gallon of pesticide formulation. If the label refers to quarts, pints, or other volume measurements, go directly to Step 4.ĭetermine the concentration of active ingredient However, some labels may list the application rate in pounds of active ingredient. Normally, the label will list pesticide application rates per acre in quarts or pints. The selected pesticide rate should be based on soil, target pest and crop conditions. The recommended range of application rates for the specific formulation is given on the label. Liquid pesticidesĭetermine the recommended application rate ![]() This two-part guide provides specific instructions for mixing both liquid and dry pesticides. Calculations for mixing liquids are different from calculations for dry materials. Pesticides formulated to be applied as sprays are sold both as liquids and as dry materials such as wettable powders. This publication describes procedures for determining how much pesticide to mix in the tank so the right amount of pesticide will be applied per acre. Liquid pesticide sprayers must apply the proper amount of a carefully mixed spray solution to be effective in controlling weed and insect pests.
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