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The table below indicates the relationship between total spray volume, flow rate
and walking speed for the HERBI-4 as per the following formula:
Flow rate (ml/min) = 6 x total spray volume (l/ha) x walking speed (m/s) x band width (m)
Total spray volume
(l/ha)
10 (i.e. glyphosate)
20 (i.e. other herbicides)
Note: The flow rates in this table were measured with the spray head 65cm below the level of the liquid in the
tank, using water only. The flow rate will vary with differences in this height and the viscosity of the spray
mix (for very viscous spray mixes it may be necessary to use a larger feed nozzle).
CALIBRATION
Choose and fit the feed nozzle that is likely to be required. The actual flow rate should
be checked holding the HERBI-4 in the spraying position. Remove the feed nozzle
from the spray head by
nozzle, allow the liquid to flow into a suitable container for one minute and measure
the volume dispensed. If the flow rate is
to 150 ml/min change the feed nozzle and repeat the above procedure.
N.B. It is preferable to walk more slowly to achieve the required spray volume than to
use higher flow rates.
Example: Required spray volume rate = 20 l/ha; Flow rate measured = 100 ml/min
Walking speed (m/s) =
i.e. 0.7 m/s or 42 metres in one minute (0.7m x 60s)
Mark out a distance of 42 metres and practice walking it in one minute.
Band width
Feed nozzle
(m)
1.2
Blue
1.2
Blue
Yellow
twisting
and pulling out, then, once liquid has reached the feed
in the recommended flow rate range of 60
not
Flow rate (ml/min)
6 x 1.2 x total spray volume (l/ha)
7
Flow rate
Walking speed
(ml/min)
(m/s)
72
1
72
0.5
144
1
100
=
= 0.7
7.2 x 20
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