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)=6xtotal spray volume (l/ha) x walking speed (m/s) x band width (m)
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
not
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 and pulling out, then, once liquid has reached the feed
nozzle, allow the liquid to flow into a suitable container for one minute and measure
the volume dispensed. If the flow rate is in the recommended flow rate range of 60
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.
twisting
Total spray volume
(l/ha)
Band width Feed nozzle Flow rate Walking speed
(m) (ml/min) (m/s)
10 (i.e. glyphosate) 1.2 Blue 72 1
20 (i.e. other herbicides) 1.2 Blue
Yellow
72 0.5
144 1
Example: Required spray volume rate = 20 l/ha; Flow rate measured = 100 ml/min
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.
Walking speed (m/s) = = = 0.7
Flow rate (ml/min)
6 x 1.2 x total spray volume (l/ha)
100
7.2x20
7
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