Special options
136
UF 01 DB 238. 07.04
5 Special options
This chapter provides you with a comprehensive overview for the
available special optional equipment.
5.1 Options for the application of liquid fertiliser
At present there are mainly two different kinds of liquid fertiliser avail-
able:
• Ammonium Nitrate-Urea-
Solvents (AUS) with 28 kg N per 100 kg
AUS.
• A NP-solution 10-34-0 with 10 kg N and 34 kg P
2
O
5
per 100 kg
NP-solution.
Important!
If the liquid fertiliser is applied by flat fan nozzles, multiply the
corresponding values from the spraying chart for the rate l/ha at
AUS with 0.88 and at NP-solutions with 0.85 as the mentioned
rates in l/ha are only valid for pure water.
The following principle applies:
Apply liquid fertilisers only in coarse droplets to avoid scorching of
plants. If the droplets are too large they will roll off the leaf and too
small droplets would enforce the magnifying glass effect. Also too
high application rates may cause scorching of the leaves - due to the
salt concentration of the fertiliser.
Basically no higher rates of liquid fertiliser should be applied as e. g.
40 kg/N (please refer also to "Conversion table for the spraying of
liquid fertilisers”). Re-fertilising of AUS with nozzles should in any
case be terminated in the growth stage 39 as otherwise scorching the
ears would result in considerable damage.
5.1.1 3-ray nozzles
Should the liquid fertiliser predominantly be absorbed by the roots
instead by the leaves of the plant the use of the 3-ray-nozzles is of
advantage for liquid fertiliser application.
An integrated metering aperture inside the nozzle produces a nearly
pressure less, coarse droplet distribution of the liquid fertiliser via
three openings. This helps to prevent the production of an undesirable
spraying mist and the production of small droplets. The coarse drop-
lets produced by the 3-ray nozzle rain gently on the plants and roll off
its surface.
Even though in this way scorching damage is avoided
as far as possible the 3-ray nozzles should not be used for late
top dressing and instead drag hoses should be used.
For the following listed 3-ray nozzles the black bayonet nuts should
be used exclusively.
Various 3-ray nozzles and their range of use
3-ray-yellow, 50 - 105 l AUS/ha, Order No.: 798 900
3-ray-red, 80 - 170 l AUS/ha, Order No.: 779 900
3-ray-blue, 115 - 240 l AUS/ha, Order No.: 780 900
3-ray-white, 155 - 355 l AUS/ha, Order No.: 781 900
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