Calibrating a sprayer is easily done in a few minutes,
once the sprayer is thoroughly checked:
- Be sure there is no residue remaining from the last time the
sprayer was used.
- Check all nozzles and screens to be sure they are all the same
size and type.
- Fill the tank with water, start the pump and check for leaks.
- Be sure all nozzles are emitting water and the pattern is
correct.
Adjust the width of the band by controlling the distance of the
nozzle from the target weed. The bandwidth should be measured at the
highest point of the weed, not the ground, when spraying for very
small weeds. A 1 x 4 works well to set the bandwidth.
Once the sprayer is working, it may be calibrated as follows:
- Determine the distance to drive in the field by selecting
the correct row width from the drop down box below. Measure
that distance and flag it.
Note: For broadcast spraying, measure the distance between nozzles and
use this as the row width to determine distance to drive.
- Determine the time, in seconds, it takes to drive the
required distance. This should be done in the field with the
sprayer operating. Drive at the speed desired. Two runs are
suggested.
- Next, catch and measure the output from the nozzle(s) for the time
determined in step 2. If the sprayer has two nozzles per
row, catch from both nozzles and insure that they both have the same
discharge rate. Ounces caught will equal gallons per acre (GPA).
Note: Be sure to read and
follow all labels on all pesticides used.
See also: Sprayer Calibration -
Method 1 |