47
Appendix A
–
Broadcast Spray Calibration Tables
Below are some guidelines to help you calibrate your tow behind broadcast sprayer. This is a very
important step in operating the tow behind broadcast sprayer such that too much or too little chemical
may be applied.
1.
Using
Table 1,
find a table that corresponds with the chemical manufacturer's suggested application
rate (gallons per acre, gallons per 1000 sq. ft., or gallons per 100 sq. ft.).
2. Find the application rate that is closest to the chemical manufacturer's recommendations.
1.
The speed to drive your ATV is listed below the application rates.
TABLE 1
Spray
Pressure GALLONS PER ACRE
–
based on water at 40" spacing
Height
(PSI)
1 MPH
2 MPH
3 MPH
4 MPH
5 MPH
7 MPH
10 MPH
21”
10
59.4
29.7
19.8
14.9
11.9
8.5
5.9
21”
20
84.7
42.3
28.2
21.2
16.9
12.1
8.5
21”
30
102.5
51.2
34.2
25.6
20.5
14.6
10.2
Spray
Pressure GALLONS PER 1000 SQUARE FEET
–
based on water at 40"
spacing
Height
(PSI)
1 MPH
2 MPH
3 MPH
4 MPH
5 MPH
7 MPH
10 MPH
21”
10
1.36
.68
.45
.34
.27
.19
.17
21”
20
1.94
.97
.65
.48
.39
.28
.19
21”
30
2.35
1.17
.78
.59
.47
.34
.23
Spray
Pressure GALLONS PER 100 SQUARE FEET
–
based on water at 40" spacing
Height
(PSI)
1 MPH
2 MPH
3 MPH
4 MPH
5 MPH
7 MPH
10 MPH
21”
10
.136
.068
.045
.034
.027
.019
.017
21”
20
.194
.097
.065
.048
.039
.028
.019
21”
30
.235
.117
.078
.059
.047
.034
.023
* Approximate flow from one nozzle
2.
Use
Table 2
to choose the throttle setting on your ATV.
TABLE 2
5. The coverage area can be found by dividing tank size by the application rate.
Example:
13 gallons divided by 8 gallons/acre = 1.625 acre of coverage per tank.
Speed
Time required in seconds to travel a distance of:
(MPH)
100 ft.
200 ft.
300 ft.
1
68
136
205
2
34
68
102
3
23
45
68
4
17
34
51
5
14
28
41
6
11
23
34
7
9.5
19
29