Table of Contents
Advertisement
Fill the tank.
Mix well by gently shaking the tank.
Examples of mixing spray – for 1 hectare
a) glyphosate (360 g/l)
2 litres
add water:
+8 litres
Total volume: 10 litres
i.e. 1 part glyphosate : 4 parts water
Wipe the tank with a dry cloth
Place the tank on the operator's back.
b) 2,4-D (500 g/l) 3 litres
add water: +17 litres
Total volume: 20 litres
i.e. 3 parts 2,4-D : 17 parts water
6
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
Band width
(l/ha)
(m)
10 (i.e. glyphosate)
1.2
20 (i.e. other herbicides)
1.2
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
twisting
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
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
Flow rate (ml/min)
Walking speed (m/s) =
6 x 1.2 x total spray volume (l/ha)
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.
Feed nozzle
Flow rate
Walking speed
(ml/min)
(m/s)
Blue
72
1
Blue
72
0.5
Yellow
144
1
in the recommended flow rate range of 60
not
100
=
= 0.7
7.2 x 20
7
Advertisement
Table of Contents
