Forest Pest Control Douce, G.K., Moorhead, D.J., and Bargeron, C.T., Forest Pest Control, The University of Georgia, College of Agricultural and Environmental Sciences, Special Bulletin 16, Revised January 2002. Appendix Sprayer Calibration Calibration determines the amount of material applied per acre within the area to be covered. By knowing the amount of material applied per acre, the rate of pesticide can be dispersed according to label directions. Calibrate with clean water when applying toxic pesticides that will be mixed with large volumes of water. When applying liquid materials, check uniformity of nozzle output across the boom or band. Collect spray from each nozzle for a known time period. Each nozzle should be within 10 percent of the average output. Replace worn or malfunctioning nozzles as necessary. When applying materials that are appreciably different from water in weight or flow characteristics (such as fertilizer solutions, etc.), calibrate with the material to be applied. Exercise extreme care and use protective equipment when active ingredients are involved.
Table A1. Boom Sprayer Calibration distances with corresponding widths.
** To determine distance for spacing, divide the spacing expressed in feet into 340.3. Example: For a 13" band, the calibration distance would be 340 divided by 13/12=314.1.
The following instructions outline a simple method to calibrate a boomless broadcast or band sprayer.
Table A2. Boom Broadcast or Band Sprayer Calibration distances with corresponging widths.
** To determine distance for swath width not listed, divide the swath width expressed in feet into 340.3 and multiply by 10. Example: For 13 feet swath, the calibration distance would be 340.3 divided by 13 multiplied by 10=261.8.
Table A3. Hand Sprayer Calibration distances with corresponding band widths.
** To determine distance for spacing, divide the spacing expressed in feet into 340.3. Example: For a 13" band the calibration distance would be 340 divided by 13/12=314.1.
Table A4. Granular Herbicide calibration distances with corresponding widths.
**To determine distance for swath width not listed, divide the swath width expressed in feet into 2722.5. Example: For 13 feet swath, the calibration distance would be 2722.5 divided by 13=209.4 feet.
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