5 - Operation
91
Liquid Fertilizer
Spraying Pressure
If you are spraying with liquid fertilizer instead of pesticides, the spraying pressure must be increased in comparison to
pesticide spraying to get the desired output (l/ha).
The specific gravity for liquid fertilizer is normally higher than for water and spray liquids - so to get the correct output (l/ha),
the spraying pressure must be adjusted.
Example:
Nozzle output is 2.40 l/Min at 3.0 bar pressure. Specific gravity of liquid fertilizer is 1.20 g/cm³.
Multiply the pressure value with the specific gravity value: 3.0 x 1.20 = 3.6.
The adjusted pressure is now 3.6 bar for spraying the liquid fertilizer.
In the table below, adjusted pressure values can be found for different specific gravities of liquid fertilizers.
μ
ATTENTION! Pressure values below 1.5 bar or above 5.0 bar are considered to be out of range for the nozzles.
÷
NOTE! Find the specific gravity for your liquid fertilizer on the packaging or on the material safety data sheet (MSDS)
included.
TankGauge in MainTank
When the MainTank is filled with liquid fertilizers that has higher specific gravity, the TankGauge may show incorrect values.
Therefore the specific gravity for the TankGauge need to be corrected.
1. In the controller, go to menu [3.5.1 Adjustment of specific gravity].
2. Set specific gravity.
3. Press Enter to confirm.
Additional Information
See the other book delivered from HARDI - Spray Technique - to get further information about:
• Calibration of the sprayer
• Nozzle Choice
• Nozzle Wear
• Spray Distribution
• Spray Pressure
• Water Volume Rates
• Weather Influence on Spraying
• Useful Formulae
For optional equipment - see other books delivered or contact HARDI.
Specific gravity (g/cm³) for Liquid Fertilizer
1.10 1.15 1.20 1.30 1.40
Calibrated Pressure (bar) when Spraying with
Pesticides
Adjusted Pressure (bar) when Spraying with Liquid Fertilizer
1.5 1.7 1.7 1.8 2.0 2.1
2.0 2.2 2.3 2.4 2.6 2.8
2.5 2.8 2.9 3.0 3.3 3.5
3.0 3.3 3.5 3.6 3.9 4.2
3.5 3.9 4.0 4.2 4.6 4.9
4.0 4.4 4.6 4.8 5.2 5.6
4.5 5.0 5.2 5.4 5.9 6.3
5.0 5.5 5.8 6.0 6.5 7.0
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