calibrating homeowner equipment

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Calibrating Homeowner Equipment. Equipment. Hose-end sprayers Compressed air sprayers Knapsack sprayers Trombone sprayer/ bucket (stirrup) sprayer Fogger Spray bottle. Types of Application. Foliage sprays (shrubs, trees) Area coverage (soils or lawns) Spot sprays LAWN Fertilization - PowerPoint PPT Presentation


  • Calibrating Homeowner Equipment

  • EquipmentHose-end sprayersCompressed air sprayersKnapsack sprayersTrombone sprayer/ bucket (stirrup) sprayerFoggerSpray bottle

  • Types of ApplicationFoliage sprays (shrubs, trees)Area coverage (soils or lawns)Spot spraysLAWNFertilizationWeed controlInsect/Fungi control HORTFertilizationInsect/Disease controlDormant oil treatments

  • Area Coverage (soils or lawns)Application should provide even wetting of entire surface with no areas of intense concentrationOften recommend to cut application rate in half and cover area opposite angles - not always good since application rate and speed not proportionalin same direction alternating rows per application

  • Foliage Sprays (shrubs, trees)Most recommendations advise spraying the foliage with diluted chemical to the point of runoffDifficult to do uniformly

  • Calibration ProcedureAdd a known amount of water to the sprayer. Spray the water as uniformly as possible to the point of runoff.Measure the amount of water left in the sprayer and subtract it from the amount added to the sprayer in the beginning

  • Calibration ProcedureMeasure and mark off an area of 1000 sq ft.Add a measured amount of water to spray tank, spray area, and then measure the amount of water remaining in the tank. The difference between the amount in the tank before and after spraying is the amount used.

  • Steps:Mark off a calibration course of 1000 sq. ft.Accurately measure the time required to spray the calibration course using a proper technique. Remember only record the amount of time the gun is actually spraying.Measure the flow rate from the gun. Using the time recorded in step 2, spray into a calibrated container for that same length of time.Amount in the container represents the application rate per 1000 sq. ft.Alternative Calibration Procedure

  • Example:It took 50 seconds for an applicator to spray the 1000 sq. ft. calibration course. The amount of spray collected from the gun in the 50 seconds was 1.4 gallons.The application rate for this example is:

    1.4 gallons per 1000 sq. ft.or61 gallons per acre (43.56 x 1.4)Alternative Calibration Procedure

  • Spot SprayersFence rows.Weeds in beds or turf.Calibrate sprayer same as in Area Coverage, but estimate area of spots to be covered when figuring amount of water and chemical to add to spray tank.

  • Hose-end SprayersSimple and inexpensiveUse water pressure from garden hose to distribute the spray.Chemical added to jar as concentrate.

  • Siphon ActionDraws the solution in the jar and mixes it at a predetermined rate with the water spraying out of the nozzle.siphoning tube

  • Marks on Jar:Gallon scale on jar indicates total amount of water and pesticide solution in the jar applied.Ounces give amount actually in jar while gallons give amount supposed to be sprayed out once mixed with water from Jar filled to 10 gal mark (25 oz of solution). When jar is empty, 25 oz has been applied with 10 gallons of water.

  • Calibration:Measure and mark off an area of 1000 sq ft.Fill jar with water to a measured level.Spray marked area uniformly and then check the amount left in the jar.Add to the jar the chemical needed to spray the number of sq ft in your yard or garden area. Then add enough water to the jar to bring the level up to the gallonage mark required to cover the sq ft to be treated.

  • Notes:To obtain uniform application cut rate in half and spray area twice; overlapping motion as you walk. Always use uniform walking speed during application.

  • Sprayer AccuracyWater pressure affects accuracy of sprayer.Designed to operate at 40 psi (typical water pressure found in most areas).Hose length not to exceed 50 ft and min. dia. of 5/8 inch.

  • Example Calibration ProblemYour yard is 3500 ft2, and you want to apply a pesticide at the rate of 3 oz/1000 ft2 (according to label).In calibration you added water to the 6 gallon mark on the jar. After spraying an area of 1000 ft2, equivalent of 4 gal. is left in the jar.How much water and chemical should you put in the jar?

  • Example of CalibrationArea covered = 1000 ft26 gal. - 4 gal. = 2 gal.Yard is 3500 ft2From label: 3 oz/1000 ft2(3500 x 3)/1000 = 10.5 ozThe jar is filled to:( 3500/1000) x 2 = 7 gal.50 ft20 ft3500 ft2

  • Compressed Air SprayersPesticides already mixed to their proper spraying dilutionTank pressurized with compressed air or carbon dioxide

  • Pressure Control:Fill tank 2/3 full with spray material so considerable air space if left for initial expansion.Repressurize tank frequently.If pressure gage is used, repressurize when pressure drops about 10 psi from initial reading.

  • Notes:Shake occasionally to keep materials in solution/suspension/emulsion.Each sprayer comes with a nozzle that can be adjusted to provide fine spray, coarse spray, and solid stream.

  • Trombone Sprayer/ Bucket (stirrup) SprayerInexpensive, durable, telescoping, plunger-action pumps that provide continuous spray.Can reach tops of 25 to 30 foot trees.Must carry bucket with you.Bucket sprayer involves a foot support for the bucket

  • FoggerUsed in small areas to control insectsOil based insecticide is used along with a lit propane tank to volatilize the spray and produce smoke or fog.Allow fog to dissipate before reentry to area.Very likely to drift so extreme care must be taken.

  • Spray BottleHouse plants, small flower beds and gardens, small shrubsSpray to point of runoffSimply add proper amount of water and pesticide according to label

  • CalculationsGPA=5940#$!@&%!

  • MEASURE SPEED(1 MPH = 88 Feet traveled in 60 seconds)Measure the ground speed in an area similar to the conditions of the area to be sprayed!

  • Measurement of small land areaApply proper amounts of pesticidethe area must be accurately determined

  • Field measurement methodsDivision of the area into simple figures.Offsets from straight lines.Maples-Turf technique.Coordinates.

  • ExampleCalculate a irregular shaped turf12732

  • a1d2/4=706 ft2a2 = 20 x 50 = 1000 ft2s = (32+20+40)/2 = 46a3 = (s(s-32)(s-40)(s-20))1/2 = 317 ft2A = a1+a2+a3 = 2023 ft2 3020403250a1a2a3

  • Trapezoid areaabhArea = h * (a+b)/2(a+b)/2

  • Offsets from straight linesTrapezoidal rule:divide the figure into an even nummer, n, of strips.dddhn



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