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4.7.6
AREA COVERED
To determine application rates, it is necessary to
know the area covered by the sprayer during one
pass. Table 4 gives the area for three widths:
Table 4 Actual Sprayer Coverage
Sprayer
Acres
Width
1/2 mile 1/4 mile
3.64
60'
4.85
80'
5.45
90'
Hectares
1/2 km 1/4 km
1.82
1.45
0.73
2.42
1.94
0.97
2.73
2.18
1.09
4.7.7
FIELD CALIBRATION
To verify the application rates in the fi eld, follow this
procedure:
1.
Fill the tank to the neck with water and mark the
level of water.
2.
Check that all screens are clean.
3.
Set the chemical system pressure to the desired
value and run the tractor at the selected engine
RPM in the selected gear.
4.
Drive through the measured distance while
spraying.
5.
Refi ll the tank to the same mark and measure the
amount required.
6.
Divide the amount of liquid sprayed by the area
covered to determine the application rate.
Appl. Rate = Volume sprayed
Area covered
gals (liters)
acre (hectare)
Table 5 Conversions
1 km ........................................................................ 0.62 mile
1 ha .......................................................................... 2.5 acres
1 g ............................................................................0.035 oz.
1 kg ..............................................................................2.2 lbs.
1 g/ha .............................................................0.014 oz/acre
1 kg/ha .............................................................0.88 lb/acre
1 ml ..................................................................... 0.035 fl . oz.
1L .................................................................... 0.264 gal (US)
1L ................................................................... 0.22 gal (Imp.)
1L/s .............................................................15.85 gpm (US)
1L/s ......................................................... 13.20 gpm (lmp.)
1 kPa ........................................................................0.145 psi
1 mm .......................................................................... 0.04 in.
1 m ...............................................................................3.28 ft.
1 L/ha ..................................................0.106 gal (US)/acre
1 L/ha ...............................................0.088 gal (Imp.)/acre
=
29
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