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Available Equipment

Equipment to Use

Phillips County Weed District offers equipment that can be used for free.  We require a damage deposit to be placed when equipment is picked up.  The deposit will be returned when the equipment is returned damage free.


 2 Backpack Sprayers

 Back Pack Sprayer

1 sprayer for an ATV

Sprayer for ATV

1 Grasshopper Control Spreader


Calibration Instructions

Calibration of a sprayer is setting the sprayer so you know how much herbicide is being applied when you spray.  The results are how many gallons per acre your sprayer is putting out to get the correct amount of chemical to mix in the tank.  Depending on the type of sprayer you have there are many different methods, we have list just a couple of methods below.

Boom sprayers
Calibrating a sprayer can be determined by knowing the volume of liquid delivered out of the nozzles over time. 

Measure off a given distance that when multiplied by the swath of the boom you will have 1/10 of an acre (4,356 sq. ft.).

Once the distance is determined and marked off in the field, prepare the sprayer and set the pressure to the rate it will be used during spraying.

Fill the tank with water if capacity is 50 gallons or less.  For larger tanks fill to one half capacity.

Select a ground speed that will be used during spraying and note the throttle setting, gear, and rpm of the engine so that it can be duplicated.

Drive the distance marked off in the field at least two times maintaining the constant speed selected.  Time how long it takes each time to travel the distance marked off.  Average the time.

With the sprayer parked collect the volume of liquid sprayed from one nozzle or from each nozzle for the time it took to travel the measured distance.  The pressure must be maintained as in field conditions.

The application rate per acre can now be calculated as follows:

Total volume (all nozzles) x 10 (travelled 1/10 acre) = rate per acre

Handgun or backpack sprayer

Establish a calibration plot that is exactly:  18.5 feet wide X 18.5 feet long.  Spray the calibrated plot uniformly with water, noting the number of seconds required.

Spray into a bucket for the same number of seconds.

Measure the number of ounces of water in the bucket.

The number of ounces collected from the bucket is equal to the number of gallons per acre the sprayer is delivering.