Lit. No. 72623, Rev. 00
14
April 15, 2019
ACCESSORY SPRAY BOOM CALIBRATION
Chemical product labels may show application rates
in gallons per acre, per 1000 ft
2
, or per 100 ft
2
. The
Spray Coverage tables show all three rates.
After determining how much mixed solution you
are going to spray for your job, select the spraying
pressure (psi) and spraying speed (mph) needed. You
will find optimal spraying in the 20 to 30 psi range.
Adjust the boom height if needed to position the
nozzles 18" to 20" above the ground. For the best
spray pattern coverage, the nozzles may be rotated
rearward 15°.
To determine the ground speed of your sprayer,
measure and mark driving distances of 100, 200, or
300 feet. The table below indicates the number of
seconds needed to travel these distances. Set the
throttle and, with a rolling start, drive the measured
distance of your choice.
Adjust the throttle until you can match the number
of driving seconds needed. Mark the throttle setting
and note the gear range so you can use them while
spraying.
Add water and chemicals in the proper amounts in the
spray tank and drive to your starting point. When you
are ready to spray, turn the boom control valve OFF.
Once the pump is turned ON, the unit will begin
spraying. The system pressure will decrease slightly
as fluid begins flowing from the spray nozzles. This
is normal; the pressure will recover when the control
valve is turned OFF.
15°
CAUTION
Always use appropriate personal protective
equipment, including gloves and safety
goggles, when filling sprayer.
Speed
(mph)
Time (sec) Required to Travel a Distance of:
100 ft
200 ft
300 ft
1.0
68.0
136
205
2.0
34.0
68
102
3.0
23.0
45
68
4.0
17.0
34
51
5.0
14.0
27
41
6.0
11.0
23
34
7.0
9.7
19
29
8.0
8.5
17
26
9.0
7.6
15
23
10.0
6.8
14
20
Converting gal/acre to gal/1000 ft
2
Most chemical labels indicate a chemical
application rate in 1,000 ft
2
.
If the rate on the chemical label is indicated in
gallons per acre, divide the per acre rate by 43.56
to convert to gallons per 1,000 ft
2
.
1 acre = 43,560 ft
2
1 gallon per 1000 ft
2
= 43.56 gallons per acre
Other Conversion Factors
1 fl oz = 2 Tbl
1 cup = 8 fl oz
1 pint = 2 cups = 16 fl oz
1 quart = 2 pints = 32 fl oz
1 gallon = 4 quarts = 8 pints = 128 fl oz
