Nozzle size
A higher-output nozzle increases the volume delivered. Use the manufacturer’s nozzle charts to choose the required size.
INDIGO SPECIALTY PRODUCTS / FIELD TOOLS
Spray calibration
Check your nozzles. Measure your travel. Know your application rate.
For broadcast boom spraying with equal nozzle spacing. Take measurements with clean water at your intended operating pressure.
1
NOZZLE UNIFORMITY
Check each nozzle.
Catch the output from every nozzle for the same time, at the same pressure. Enter the volume collected from each nozzle in litres.
The original calculator uses a 30-second catch. The measured average is converted to L/min for the application-rate step.
Enter at least two nozzle readings to check uniformity.
- Average catch
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- Lowest catch
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- Highest catch
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| Nozzle | Catch (L) | Variation | Check |
|---|
Workbook threshold: replace nozzles whose output differs by 5% or more from the mean. A zero catch is included as a nozzle needing attention when the other readings are valid.
2
SPRAY APPLICATION RATE
Measure your setup.
Catch several nozzles for one minute and enter the average in L/min, or use your converted average from step 1. Measure distance travelled in one minute at your spraying speed.
Use actual measured output and travel distance.
Keep the same operating pressure for collection and spraying. This tool calculates carrier volume, not the amount of pesticide to add.
3
ADJUST & RECHECK
Changing the application rate
Ground speed
At the same nozzle output, faster travel reduces L/ha and slower travel increases L/ha. Use the optional target calculation to compare.
Pump pressure
Higher pressure increases nozzle output. Check the manufacturer’s operating range and droplet guidance, then measure again.
Calculation method & original workbook
Uniformity: variation (%) = (individual catch − mean catch) ÷ mean catch × 100. All catches must use the same collection time.
Average nozzle output: mean catch (L) × 60 ÷ collection time (seconds).
Application rate: L/ha = average nozzle output (L/min) × 10,000 ÷ [nozzle spacing (m) × distance travelled in one minute (m)].
Ground speed: km/h = distance travelled in one minute (m) × 0.06.
Target speed: km/h = 600 × nozzle output (L/min) ÷ [nozzle spacing (m) × target rate (L/ha)]. This assumes the nozzle output stays the same.
The original workbook example is 1.5 L/min, 0.5 m spacing and 100 m travelled in one minute: 0.03 L/m², or 300 L/ha.
Download original Sprayer Calibration Calculator (.xls) ↗