To properly calibrate these sprayers and train your applicators, you need to know these four important factors.
1. Application Rate
The standard rate is measured in the amount of liquid applied per unit area, usually in gallons per 1,000 sq. ft. Several factors can affect this rate: equipment, spray delivery system, product, target, growing conditions and operational considerations. Your goal is to apply the proper rate consistently in a uniform practice.
2. Swath Width
For lawns, this ranges from three to 10 feet. You can use a series of collection cups or a spray tray to measure the swath width you want. A standardized height, as well as movement with certain handheld spray delivery systems, will assure that a constant swath width is maintained. An effective swath is the total swath width minus the amount of swath overlap.
3. Walking Speed
Once you've established the dimensions of your calibration course, here's how to find out the right walking speed for application. Just time your trainee while covering the course with the effective spray width. Or if you need to find out the speed in miles per hour, use the following formula:
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Calibration and Flow Rate
Calibration is the process of measuring and adjusting the amount of liquid mixture applied to an area. Use this basic formula:
(Calibration course x Flow = gal./1,000 sq. ft. flow rate coverage time )
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