Application Concernsfor Control of

Invasive Species‘A focus on Equipment & Calibration’

Changes in the Application Industry!

• Historically inefficient process• Increased cost of pesticides• Product rates are changing (< an ounce/acre)• More pest specific products• Biotechnology and GMO’s (Roundup Ready, Bt’s)• More sophisticated equipment (electronics) $$$

• Farmers doing there own spraying????• Variable rates• Site-specific• Focus on Drift

Productivity

Efficacy

Off-site protection

The applicationtriangle

Equipment cost today?How much do these machines cost?

Equipment cost today?

How much do these machines cost?

Automated Systems• Injection

• Multiple position nozzles

• Multiple chemicals

Application EquipmentManual Sprayers

– Compressed air

– Knapsack

CF Valve

Easy Spray Valve

Power Hydraulic

Sprayer– Low-pressure– High pressure

Application Equipment

Sericea Lespedeza Control

Sprayer Components:

• Tanks (contamination issues) • Pump, Strainers, Agitation• Pressure gauge• Hoses, Flow control assemblies• Electronics: monitors-computers-

controllers (GPS/GIS)• Distribution system• Nozzles!!!!!!!!!

Types of Pumps:

• Roller Pump• Centrifugal Pump• Diaphragm Pump• Piston Pump• Peristaltic Pump (Squeeze

or hose pump – chemical injection)

Nozzle Technology? How to use??

• Nozzles designed to reduce drift• Improved drop size control• Emphasis on ‘Spray Quality’

NOZZLE TYPES:

FLAT SPRAY–Extended Range Flat-Fan–Turbo Flat-Fan–Drift Reduction Flat-Fan–Turbo Flood–Off center Flat-Fan

Spray Characteristics are Important

Demonstrates Turbo Flat vs TurboDrop-5 MPH Wind

Is this tip good or bad?

Off-Center Venturi Flat-fan

Boom Buster

XP BoomJet

Boom Extender:

Aerial Applications

 

The CP STRAIGHT STREAM NOZZLE

Nozzles are important because:

• Control the amount – GPA.

• Determine uniformity of application.

• Affects the coverage.

• Influences the drift potential.

1. Control the Amount applied:

Nozzle Flow Rate is affected by:

• Orifice size• Pressure• Solution characteristics

Page 15

Nozzle Selection Chart:

Pages

9, 12

Calibration!!!!Ensuring that the spray output is

what it is supposed to be!

Calculations

GPA=

5940

#$!@&%!#$!@&%!

Calibration/Nozzle Selection:

• What is the first step?• Use label to select the

– application volume– product rate

• Choose an appropriate travel speed

• Effective width of application– nozzle spacing

• Calculate GPM – Flow rate per nozzle

• Select the correct size of nozzle!

Flow rate equation

GPMGPA x MPH x SW(ft)

495

GPMGPA x MPH x W in

( )

5940

or

(5940/12” = 495)Page 173 – TeeJet Guide

Example:

You are going to spray a pasture using a boomless nozzle at a rate of 20 gallons per acre. The sprayer is travelling 5 MPH and has a 15 foot (180 inches) swath width per nozzle.

1. What is the correct flow rate?

2. Which XP TeeJet nozzle would you choose and at what psi?

Calculate Nozzle Flow Rate

GPMx x

495? ? ?

GPMx x

495 20 5 15

495

1500GPM

Answer

3.0

XP BoomJet: Page – 32, 33

Measuring Ground Speed

Ground Speed - Miles Per Hour (MPH)

Where traveling 88 ft. in 60 seconds = 1 MPH

Doubling the ground speed reduces

the output by 1/2.

Speed(MPH)Distance(ft) x 60

Time(seconds) x 88

Hand Sprayer Calibration

Spraying to the point of runoff

• product added to each gal. or 100 gal.• uniform coverage-dripping from leaves• time and gallons per tree/1000 sq. ft.

“Dilute”

Technique important!!

Calibration ProcedureSteps:

– 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.

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.

Hand Spray Guns: cont.

The application rate for this example is:

1.4 gallons per 1000 sq. ft.or

61 gallons per acre (43.56 x 1.4)

Thursday: Sprayer Workshop

• Discuss hand sprayers – show examples• Discuss hose end sprayers on flat bed

truck.• Calibrate hose end sprayer using a 500

sq. ft. area.• Discuss big spray truck and boombuster

nozzle setup.• Demonstrate boombuster and collect

patterns.