Product Manual
Appendix A – Broadcast Spray Calibration Tables
32
Below are guidelines to help you calibrate your broadcast spray kit. This is a very important step
in operating the broadcast kit 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.
3. The speed to drive is listed above the application rates.
TABLE 1
SPEED (MPH)
Spray
Pressure
Flow
2
3
4
5
6
7
8
9
10
11
12
Height
(PSI)
(GPM)
GALLONS PER ACRE - based on 36 foot spray pattern
36”
20
3.0*
41
28
21
17
14
12
10
9
8
7.5
7
36”
30
3.5*
48
32
24
19
16
14
12
11
10
9
8
36”
40
4.3*
59
39
30
24
20
17
15
13
12
11
10
SPEED (MPH)
Spray
Pressure
Flow
2
3
4
5
6
7
8
9
10
11
12
Height
(PSI)
(GPM)
GALLONS PER 1000 SQ.FT. - based on 36 foot spray pattern
36”
20
3.0*
.94
.64
.48
.39
.32
.28
.23
.21
.18
.17
.16
36”
30
3.5*
1.10
.73
.55
.44
.37
.32
.28
.25
.23
.18
.18
36”
40
4.3*
1.35
.90
.69
.55
.46
.39
.34
.30
.28
.25
.23
SPEED (MPH)
Spray
Pressure
Flow
2
3
4
5
6
7
8
9
10
11
12
Height
(PSI)
(GPM)
GALLONS PER 100 SQ.FT. - based on 36 foot spray pattern
36”
20
3.0*
.094
.064
.048
.039
.032
.028
.023
.021
.018
.017
.016
36”
30
3.5*
.110
.073
.055
.044
.037
.032
.028
.025
.023
.018
.018
36”
40
4.3*
.135
.090
.069
.055
.046
.039
.034
.030
.028
.025
.023
*Approximate flow from one nozzle
4. Use Table 2 to choose a throttle setting if you lack a speedometer.
TABLE 2
5. The coverage area can be found by dividing tank size by the application rate.
Example: 200 gallons divided by 12 gallons/acre = 16.7 acres 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