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VERTICAL NOZZLE PATTERNS
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Roadside brush control results one year after application of herbicides with a RADIARC® SPRAYER used in the vertical position. |
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Applications of grass growth regulators and seedhead inhibitors to roadsides require more uniformity across the spray swath than do many broadleaf weed control applications. In addition, the area requiring the most uniform and thorough coverage is usually the area immediately adjacent to the road surface or shoulder. Trials with the RADIARC® SPRAYER indicate that these coverage objectives can be achieved with the RADIARC® SPRAYER mounted in the "vertical" position. Obviously, these vertical nozzle arrangements can also be used for broadleaf weed control and total vegetation control. Pattern tests on roadside vegetation showed that the following nozzle arrangements would provide uniform coverage at the volumes, speeds, pressures and swath widths shown: |
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Plug Plug Plug .070 .085 .085 .070 .045 Plug Plug |
Plug Plug Plug .070 .085 .085 .085 .045 .045 Plug |
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Plug Plug Plug .070 .045 .045 .045 .030 Plug Plug |
Plug Plug Plug .070 .045 .045 .045 .030 .030 Plug |
Plug Plug Plug .101 .101 .101 .070 .070 Plug Plug |
Plug Plug Plug .101 .101 .101 .101 .070 .070 Plug |
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If a narrower swath is required, remove one or more nozzles from the top of the arrangement. Higher spray pressures will increase swath width and decrease droplet size. Drift control will be reduced at pressures higher than 30 psi. Increasing forward speed will reduce the spray volume, but may also affect swath width. Always calibrate the spray system for each nozzle pattern by measuring the gallons per minute, swath width and forward speed and calculating the gallons per acre using any common calibration method. In these field trials, the RADIARC® was mounted at the front, leeward side of the vehicle. A rheostat setting of 60% gave the greatest uniformity with this nozzle pattern, although voltage and mounting variables make it necessary to determine optimum settings in each mounting position and for each nozzle arrangement. These nozzle patterns are meant to serve as guides. Field test each arrangement over a suitable test surface and make changes as required. When using the vertical mounting position, mount the RADIARC® so that the motor cover is slightly higher than the spray head, or slopes to the spray head. This will prevent spray mixture from accumulating in the motor compartment. When the RADIARC® SPRAYER is used in the vertical position, some spray mix in the spray unit will drip out for a brief period each time the unit is turned off (as with large orifice OC nozzles.) To minimize this dripping, mount an electric solenoid valve at the RADIARC® inlet so that the spray mix in the feed hose will not continue to drip. Other nozzle arrangements which may be useful are: |
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Plug Plug Plug .070 .045 .045 .045 .030 Plug Plug |
Plug Plug Plug .070 .045 .045 .045 .030 .030 Plug |
Plug Plug Plug .101 .101 .101 .070 .070 Plug Plug |
Plug Plug Plug .101 .101 .101 .101 .070 .070 Plug |
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If a narrower swath is required, remove one or more nozzles from the top of the arrangement. Higher spray pressures will increase swath width and decrease droplet size. Drift control will be reduced at pressures higher than 30 psi. Increasing forward speed will reduce the spray volume, but may also affect swath width. Always calibrate the spray system for each nozzle pattern by measuring the gallons per minute, swath width and forward speed and calculating the gallons per acre using any common calibration method. |
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Below is a list of the topics for the Radiarc® Sprayer. Click on the one you want or simply press the "NEXT" button to see them in order. "Home" returns you to the Waldrum Specialties home page. |
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