EQUIPMENT OPTIONS: Turf sprayers
Here's a rundown of some of the latest models of sprayers available for turf use, as well as a few helpful facts and formulas. For more information, use the circle numbers provided at the end of each product description.
Who: Falkenberg, Inc.
What: Spotlyte broadcast sprayer
Description: The Spotlyte broadcast sprayer, 6800-20-3BKK, provides sprayer ease with hand controls. The 20-gallon sprayer with sump, gun and sight gauge offers easy access. Three built-in nozzles enable swath spraying up to 24 feet wide and ditch spraying to the right or left without the use of booms or any kind of add-on accessory. Mounted on the back of a truck or trailer, the sprayer can be operated by hand controls on your steering wheel. It operates off the vehicle's battery to provide quiet performance. The tank provides built-in storage for both the gun and hose.
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Who: John Deere
What: 200 Sprayer
Description: The John Deere 1800 utility vehicle is powered by an 18-hp, liquid-cooled engine. Four-wheeled construction and large-diameter tires minimize ground compaction. Coupled with the John Deere 200 Sprayer, the vehicle provides quick and accurate spraying coverage. The sprayer features a 200-gallon polyethylene tank styled to provide a low center of gravity and increased visibility from the operator station. The tank has a quick-fill feature that allows the operator to fill the tank anywhere on the golf course. The spray system is equipped with three motorized control valves for individual boom control.
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Who: The McGregor Company
What: All-Purpose Sprayer
Description: The McGregor All-Purpose Sprayer (APS) turf sprayer has a compact PCO tank that allows it to be a compact sprayer with complete tank drainage. It is available with tank sizes from 50 to 300 gallons. A variety of pump and engine combinations allow for the operator to match components to their unique operation. Other available options include: hose reels, boom assemblies, sprayer monitors and foam markers.
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Who: Raven Industries
Description: DATAboy Data Logging System by Raven Industries is a tool for collection of on-the-go application information. It can be purchased with the compact Raven RPR 100 GPS (Global Positioning System) receiver, flashcard and viewing software for a complete mapping package. It can also be used with any current GPS system and is compatible with most popular software packages. The DATAboy can be used on self-propelled and pull-type sprayers, spreaders and fleet trucks. When connected to a GPS receiver and a Raven console, the DATAboy will combine time and location data with product and rate information, resulting in a comprehensive picture of application activity on a second-by-second basis.
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Who: Rogers Innovative Inc.
What: Falcon Lite boom
Description: Designed for the John Deere HD200 sprayer, the easy-fold boom also fits other sprayers. It has wheels positioned in front of the spray to mitigate tracking with iron fertilizers, has optional electric fold and the tips can be serviced or calibrated at waist height even on the manual fold. It is available in two models: the FL5000, 16.5-foot model, and FL6000, 20-foot model. The shroud has been lengthened to provide more end clearance, and the airfoils have front and back mounts to secure them even at high-speed transport.
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Who: Spraying Devices Inc.
What: 225 sprayer
Description: SDI's new 225-gallon sprayer features a newly designed, low-profile, custom-molded fiberglass tank with a 10-gallon deep section sump, 30 GPM diaphragm pump hydraulically powered by the turf vehicle's hydraulic system, SDI's exclusive V8 Jet Agitation system that equals mechanical mixing and a special pump mount location for ease of maintenance. The sprayer is equipped with an all-new 21-foot convertible spray boom and motorized boom control with boom section flow balancing feature as well as SDI's Quick Foam Marker System.
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Who: Spraying Systems Co.
What: Turbo TurfJet nozzles
Description: The Turbo TurfJet wide-angle flat spray nozzle uses a pre-orifice design to create spray patterns with less than 1 percent drift-prone fine particles. These nozzles are compatible with 45-degree-angled and 90-degree-angled Quick TeeJet caps. They are recommended for nozzle spacings from 20 to 60 inches and spray pressures from 25 to 75 psi.
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Who: Textron Golf, Turf & Specialty Products
What: Cushman SprayTek
Description: The SprayTek from Cushman is a precision-calibrated, fully equipped dedicated sprayer built on a rugged Turf-Truckster chassis. A ground-speed governor ensures precise, consistent chemical application. The selection of booms includes a revolutionary, convertible boom and covered booms. A direct-drive pumping system eliminates leaking. Electric and manual hose reels are available, along with spray guns, spray hose and hose kits.
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Who: The Toro Co.
What: 80T trailer sprayer
Description: The 80T trailer sprayer has a 3.5-hp Briggs & Stratton engine that powers a diaphragm pump. A handgun with 25 feet of hose is standard to allow convenient spraying of ornamentals. It has a 14-foot boom with eight nozzles.
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Who: Westheffer Co.
What: Spray truck
Description: A 600-gallon fiberglass tank with mechanical agitation installed provides day-long capacity, billboard-type advertising and spray-mixture flexibility. It is equipped with electric start engine and electric rewind hose reel. Convenience features include hand-sprayer bracket, spreader bracket, fresh-water rinse tank and lockable storage box. All components are mounted on a heavy-duty aluminum bed with mud flaps.
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DROPLET SIZE AND EVAPORATION
The most important factor affecting drift is spray droplet size. Spray droplet diameters are measured in micrometers. One micrometer is 1/25,000 of an inch and is usually referred to as a micron. To get an idea of the size of a micron, use this comparison: The thickness of a human hair or a sheet or paper is roughly 75 microns.
The longer a droplet remains airborne, the greater the chances of it being carried by wind away from the application site. Small spray droplets are more susceptible to drift than larger droplets because they tend to remain airborne longer than the larger droplets. For example, while it takes 4 minutes from a 20-micron droplet to travel a vertical distance of 10 feet, it takes only 2 seconds for a 400-micron droplet to travel the same distance. Droplets smaller than 200 microns are considered potential drift contributors.
With water carriers, spray droplets become smaller as they fall because of evaporation. For typical applications with ground sprayers, droplets of 50 microns and less will completely evaporate to a residual core of pesticide before reaching the target. Droplets greater than 200 microns will have no significant reduction in size before deposition on the target. Evaporation of droplets between 50 and 200 microns is significantly affected by temperature, humidity and other weather conditions.
The best way to determine if a spray tip is excessively worn is to compare the flow rate from the used tip to the flow rate of a new tip the same size and type. Spray tips are considered excessively worn and should be replaced when their flow exceeds the flow of a new tip by 10 percent.
Source: Spraying Systems Co., “Droplet Size and Drift Information,” www.teejet.com.
GPM (per nozzle) = GPA × MPH × W/5,940
GPM (per nozzle) = GAL/1,000ft
GPA = 5,940 × GPM (per nozzle)/MPH × W
GPM — Gallons per minute
GPA — Gallons per acre
MPH — Miles per hour
W — Nozzle spacing (in inches) for broadcast spraying; spray width (in inches) for single nozzle, band spraying or boomless spraying; row spacing (in inches) divided by the number of nozzles per row for directed spraying.
Source: Spraying Systems Co., “Droplet Size and Drift Information,” www.teejet.com.
ONE WAY TO CALIBRATE A SPRAYER
Measure the ground speed of the rig with the sprayer implement in place. (Average the travel time of the unit in seconds over 300 feet for two separate passes.)
Calculate the ground speed.
Measure the distance in inches between spray nozzles on the boom.
Calculate the desired nozzle output (ounces or gallons).
Catch 1 minute's worth of water from one or two nozzles at the operating pressure.
Adjust the pump pressure or ground speed until the desired output is reached.
Calculate the acreage covered on one tank of spray mixture.
Finish filling the spray tank with pesticide and carrier (usually water). Apply about one-half tankful of spray and determine if the correct amount of acreage has been covered.
Continue spray application; recalibrate if the first half tankful didn't cover the correct acreage.
P.D. Ayers, Colorado State University Cooperative Extension agricultural engineer and professor, chemical and biosource engineering, and B. Bosley, Morgan County Cooperative Extension. 9/92. Reviewed 9/98.
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