Layout and function of the sprayer boom
112
UX01 Super CP Plus BAG0229.2 11.21
6.10
Special optional equipment for liquid fertiliser
There are currently two main types of liquid fertiliser available:
•
Ammonium nitrate / urea solution (AUS) with 28 kg N per 100 kg
AUS.
•
An NP solution 10-34-0 with 10 kg N and 34 kg P
2
O
5
per 100 kg
NP solution.
If the liquid fertiliser is sprayed using flat-fan nozzles, multiply the
corresponding values from the spray table for the application rate
(l/ha) by 0.88 for AUS and by 0.85 for NP solutions, as the application
rates listed (in l/ha) only apply for water.
As a rule:
Use coarse-dropped application for liquid fertiliser to avoid chemical
burns to the plants. Overly large drops roll off the leaf and drops
which are too small cause a magnifying glass effect, which burns the
leaves. Too much fertiliser may cause burns to appear on the leaves
due to the salt concentration in the fertiliser.
As a rule, do not spray more liquid fertiliser than, for example, 40 kg N
(see also "Conversion table for spraying liquid fertiliser"). Always
discontinue nozzle-based UAN fertilisation at development stage EC-
39, because chemical burns on ears have a particularly harmful effect
6.10.1 Three-ray nozzles (optional)
The use of three-ray nozzles for applying liquid fertiliser is beneficial if
the liquid fertiliser needs to be taken up more by the roots of the plant
than through the leaves.
Thanks to its three openings, the dosing aperture, which is integrated
into the nozzle, ensures a coarse-dropped, almost depressurised
distribution of the liquid fertiliser. This prevents an undesirable spray
mist and the formation of smaller drops. The coarse drops produced
by the three-ray nozzle hit the plants with little force and roll off their
surface.
Although this avoids damage from burns to the greatest
extent possible, avoid the use of three-ray nozzles for late top
dressing and use drag hoses.
For all three-ray nozzles listed in the following, only use the black
bayonet nut.
Different three-ray nozzles and their operational areas
(at 8 km/h)
•
yellow 50 - 80 l UAN/ha
•
red
80 - 126l UAN / ha
•
blue 115 - 180l UAN / ha
•
white 155 - 267l UAN / ha
