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Published bySkyla Woolcott Modified about 1 year ago

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“Spray Application Accuracy” Nozzle Selection

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Why are you here???? Are you concerned with accuracy? n $$ go bye, bye n Changing rates (< an ounce/acre) n More foliar applied products (herbicides) n More sophisticated equipment - $$$ n Environmental impact (water and air) n Inefficient n Variable rates n Site-specific Points???

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Equipment cost today? How much do these machines cost?

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What about the cost of the nozzle?

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Regardless of the cost: n n Without proper attention to the nozzle, you may end up with a misapplication

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Nozzles Control n Amount of spray applied n Uniformity of the spray n Coverage on the target n Amount of off-target drift

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Nozzle Types Flat Spray Tips: n n Extended Range Flat-fan n n Drift Reduction Flat-fan n n Turbo Flood Flat-fan n n Turbo Flat-fan n n AI Flat-fan TurboDrop Cone Spray Tips: n Raindrop

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Selecting the proper nozzle Legal issues!!

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Rated Pressure = 40 psi for most nozzle types 10 psi for turbo flood nozzles Nomenclature: Stainless Steel Insert Orifice Trade Name Fan angle and flow rate- orifice size Extended Range VisiFlo Color Coding (S,H,P,K,SS)

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Typical nozzle numbering system Extended-rangeflat-fan XR XRExtended-range degree fan angle psi Even flat-fan – (Band applications) 8002EE Even spray pattern degree fan angle psi Turbo flood - (small capacity) TF- 4 TF Turbo flood psi Turbo flood – (Floater capacity) QCTF - 40 QCTF Quick attach turbo flood psi

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Electronics/Rate Controllers n How does your system work when speed changes? n Is it pressure based? n What is the effect of going slower? n What is the effect of going faster?

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Typical nozzle numbering system Extended-rangeflat-fan XR XRExtended-range degree fan angle psi Even flat-fan – (Band applications) 8002EE Even spray pattern degree fan angle psi Turbo flood - (small capacity) TF- 4 TF Turbo flood psi Turbo flood – (Floater capacity) QCTF - 40 QCTF Quick attach turbo flood psi

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Set up for Uniformity Goal is to put the material on evenly from nozzle to nozzle, end of boom to end of boom, and across the entire field. 20-inch spacing requires 17-19” above target for 50-60% overlap.

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Set Up For Uniformity n What is the first step? n Use label to select the –application volume –product rate n Choose an appropriate travel speed n Effective width of application –nozzle spacing n Calculate GPM – Flow rate per nozzle n Select the correct size of nozzle!

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n Label requirements? Set Up For Uniformity

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Determine Your Field Speed – Know it to maintain it! 200 Feet in 27 seconds = 5 MPH X Buy a speed sensor

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Set Up For Uniformity n What is the first step? n Use label to select the –application volume –product rate n Choose an appropriate travel speed n Effective width of application –nozzle spacing n Calculate GPM – Flow rate per nozzle n Select the correct size of nozzle!

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MATERIALS AND WEAR Percent increase in nozzle flow rate Flat-fan spray nozzles after 40 hour test

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Coverage n Need knowledge of the product being used. –Systemic –Contact n What is the target? –Soil –grass –broadleaf (smooth, hairy, waxy)

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Calculations GPA= 5940

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Flow Rate Equation n Calculates for amount of flow from one nozzle n Represents the size of nozzle to put on the sprayer n Calculates for amount of flow from one nozzle n Represents the size of nozzle to put on the sprayer

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Calculations GPA= 5940 Ok, now I remember!

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Calibration/Nozzle Selection n What is the first step? n Use label to select the –application volume –product rate n Choose an appropriate travel speed n Effective width of application –nozzle spacing n Calculate GPM n Size of nozzle!

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Nozzle size - Variables n Nozzle flow rate (GPM) n Ground speed (MPH) n Effective sprayed width (W) n Application rate (GPA)

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Flow Rate Equation n Calculates for amount of flow from one nozzle n Represents the size of nozzle to put on the sprayer n Calculates for amount of flow from one nozzle n Represents the size of nozzle to put on the sprayer

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gallons per acre gallons per minute GPA = ______________________ GPM = ______________________ MPH = ______________________ W = ______________________ = a constant to convert gallons per minute, miles per hour, and inches to gallons per acre 5940 = a constant to convert gallons per minute, miles per hour, and inches to gallons per acre miles per hour nozzle spacing - inches Where:

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1. Nozzle Flow Rate - Gallons Per Minute (GPM) To double the nozzle output, the pressure must increase times 2. Ground speed - Miles Per Hour (MPH) Doubling the ground speed reduces GPA rate by___ 3. Effective Sprayed Width (W) (Nozzle spacing, band width, number of nozzles on drop) 4 1/2 Variables

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Electronics/Rate Controllers n How does your system work when speed changes? n What is the effect of going slower? n What is the effect of going faster?

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You want to broadcast a foliar herbicide at 10 GPA traveling 5 MPH using extended range flat-fan nozzles on 20-inch spacing. Use equation to calculate for flow rate? GPM Example

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GPA Example Solution GPM=? GPA=? MPH=? W=? GPM=? GPA=10 MPH=5 W=20

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GPM Example Solution Answer.17

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n Calculate GPM (formula) n Look under ‘Capacity of 1 nozzle in GPM’ column n Match to pressure-psi n Choose the size needed n Operate at given pressure and speed to achieve GPA Selecting the proper nozzle….

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