Appendix A: Broadcast Spray Calibration Tables - North Star M2681781B Owner's Manual

Appendix A –Broadcast Spray Calibration Tables
Below are some guidelines to help you calibrate your broadcast sprayer. This is a very important step in
operating the 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.
3. The speed to drive your tractor is listed below the application rates.
Gallons per Acre (based on 36" spraying height and 14ft spray pattern)
Application Rate
Speed To Drive
Gallons per 1000 Sq.Ft. (based on 36" spraying height and 14ft spray pattern)
Application Rate
Speed To Drive
Gallons per 100 Sq.Ft. (based on 36" spraying height and 14ft spray pattern)
Application Rate
Speed To Drive
4. Use Table 2 to choose the throttle setting on your tractor.
Speed
(MPH)
1
2
3
4
5
6
7
5. The coverage area can be found by dividing tank size by the application rate.
Example: 55 gallons divided by 12 gallons/acre = 4.58 acre of coverage per tank.
Finding the MPH to run your vehicle for desired performance.
GALLONS

MPH
SPRAY WIDTH IN
GALLONS

MPH
SPRAY WIDTH IN
TABLE 1
49.5 36
1 MPH 2 MPH
1.14 .83
1 MPH 2 MPH
.114 .083
1 MPH 2 MPH
TABLE 2
Time required in seconds to travel a distance of:
100 ft.
68
34
23
17
14
11
9.5

PER M INUTE 136

INCHES GAL. PER 1000

PER M INUTE 5940

INCHES GALLONS PER
16.5
3 MPH
.38
3 MPH
.038
3 MPH
200 ft.
136
68
45
34
28
23
19
2
FT
ACRE
39
12 10
4 MPH 5 MPH
.28 .23
4 MPH 5 MPH
.028 .023
4 MPH 5 MPH
300 ft.
205
102
68
51
41
34
29