5 - Operation
67
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 density 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. Density of liquid fertilizer is 1.20 g/cm³.
Multiply the pressure value with the density value: 3.0 x 1.2 = 3.6; the adjusted pressure is then 3.6 bar for spraying the liquid
fertilizer.
In the table below, adjusted pressure values can be found for different densities 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 density for your liquid fertilizer on the packaging or on the material safety data sheet (MSDS) included.
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 Extras - see other books delivered or contact HARDI.
Density (g/cm³) for liquid fertilizer
1.10 1.15 1.20 1.30 1.40
Calibrated pressure (bar)
[Spraying with pesticides]
Adjusted pressure (bar)
[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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