III
C
ALIBRATION
1)
Chemical labels may show application rates in gallons per acre, gallons per 1000 square feet,
gallons per 100 square feet, or litres per hectare. The TIP CHART on the next page shows
gallons per acre and litres per hectare ratings. If your chemical labels use 1000 or 100 square
feet use the gallons per acre with the following conversion:
- For 1000 square feet: divide by 43.56
- For 100 square feet: divide by 435.6
2)
Once you know how much you are going to spray then determine (from the TIP CHART) the
spray pressure (PSI), spraying speed (MPH), and spray width (INCHES) [1 foot = 12 inches].
The weather condition must be considered when setting the sprayer.
3)
Determining the proper speed of the tractor can be done by marking off 100, 200,
and 300 feet. The speed chart indicates the number of seconds it takes to travel the distances.
Set the throttle, and with a running start travel the distances. Adjust the throttle until you
travel the distances in the number of seconds indicated by the speed chart. Once you have
reached the throttle setting needed, mark the throttle location so you can stop and go again
(returning to the same speed).
SPEED CHART
Speed in M.P.H.
Time Required in Seconds to Travel a Distance of:
(Miles per Hour)
100 ft.
200 ft.
300 ft.
4.0 17.0
34 51
5.0 14.0
27 41
6.0 11.0
23 34
8.0 8.5
17
26
10.0 6.8 14 20
12.0 5.7 11 17
14.0 4.9 10 15
16.0 4.3 9 13
20.0 3.4 7 10
13
4)
Add water and proper amount of chemical to tank and drive to the starting place for spraying.
Adjust pressure with pressure adjusting valve to the pressure required. This must be
determined from the nozzle tip chart and application rate recommended by the chemical
manufacturer.
WARNING: Read your chemical supplier warning labels.
CAUTION: - Do not spray on windy days.
- Protective clothing must be worn when spraying hazardous
chemicals.
- Be sure to read and understand this manual before spraying.
