1/128 Method

For nozzle types including Boombuster, Boominator, Boomjet

__For Boomless Sprayers__For nozzle types including Boombuster, Boominator, Boomjet

Step 1:

With water in the tank, begin spraying with the nozzle or nozzles that will be used.

Measure the length of the spray pattern in inches.

Step 2:

Spray into a container or bucket for 1 minute with the nozzle(s) that will be used.

Measure the amount of water in the container in fluid ounces. This is the ounces per minute that the sprayer is putting out. To get gallons per minute (GPM), divide the ounces per minute by 128.

Step 3:

Select the speed in miles per hour (MPH) that will be used for spraying.

Step 4:

Use one of the formulas to determine the gallons per acre that will be applied by the sprayer

Gallons per acre (GPA) = 5940 x gallons per minute (GPM) or GPA = 46.4 x ounces per minute

MPH x spray pattern length (inches) MPH x spray patter length (inches)

If the nozzle spray pattern was 18.5 feet (222 inches), the amount collected from the container after 1 minute was 480 ounces (3.75 gallons), and the speed that will be used for spraying is 5 miles per hour,

5940 x 3.75 GPA = 20 GPA 46.4 x 480 ounces/min = 20 GPA

5 mph x 222 inches or 5 mph x 222 inches

then the sprayer is putting out 20 gallons per acre. If the recommended rate of an herbicide is 32 ounces per acre, and the sprayer is putting out 20 GPA, then you would need to add 32 ounces of herbicide to 20 gallons of water.

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1/128 Method

For Hand Sprayers and High Pressure Handguns

One gallon = 128 ounces

Area to be sprayed is 1/128 of an acre

Ounces collected = gallons per acre (GPA)

Measure out an area 340 square feet (1/128 acre), which is 18.5 ft x 18.5 ft.

With water in the tank, record in seconds the time it takes to spray the measured area. Repeat this step a few times and calculate the average time.

Spray into a container or bucket for the same amount of time recorded to spray the area in step 2.

If the recommended rate of an herbicide is 32 ounces per acre, and the sprayer is putting out 40 GPA, then you would need to add 32 ounces of herbicide to 40 gallons of water. SINCE there are NO 40 gallon backpack units, you need to divide 32 by 40.

For Hand Sprayers and High Pressure Handguns

One gallon = 128 ounces

Area to be sprayed is 1/128 of an acre

Ounces collected = gallons per acre (GPA)

__Step 1:__Measure out an area 340 square feet (1/128 acre), which is 18.5 ft x 18.5 ft.

__Step 2:__With water in the tank, record in seconds the time it takes to spray the measured area. Repeat this step a few times and calculate the average time.

__Step 3:__Spray into a container or bucket for the same amount of time recorded to spray the area in step 2.

**The amount of water in ounces collected from the container equals the gallons per acre (GPA) the sprayer is putting out.**If the recommended rate of an herbicide is 32 ounces per acre, and the sprayer is putting out 40 GPA, then you would need to add 32 ounces of herbicide to 40 gallons of water. SINCE there are NO 40 gallon backpack units, you need to divide 32 by 40.