Watering and Irrigation
Irrigation Frequency Calculator
Irrigation Frequency is intended to estimate irrigation interval from stored water and daily use. Replace its starting values with the scenario being evaluated.
Enter values for days between irrigation
Keep Irrigation Frequency units with their measurements.
From usable root-zone water to days between irrigation
Division connects Usable root-zone water and Daily crop use in this Irrigation Frequency calculation.
Irrigation Frequency evaluates usable root-zone water at 1.4 in and daily crop use at 0.18 in/day as 7.78 days.
Days between irrigation: condition to verify
Hot or windy days can shorten the interval.
A zero Daily crop use leaves days between irrigation undefined in Irrigation Frequency.
Scope of this days between irrigation calculation
Irrigation Frequency focuses on Days between irrigation and combines Usable root-zone water and Daily crop use.
Use days between irrigation to estimate irrigation interval from stored water and daily use, then inspect usable root-zone water in the field.
Measurements for Irrigation Frequency
Days between irrigation is calculated from Usable root-zone water and Daily crop use. Check the Irrigation Frequency units before editing. Zone flow is available from Irrigation Zone Flow Calculator.
- Usable root-zone water
- Default in Irrigation Frequency: 1.4 in.
- Daily crop use
- Default in Irrigation Frequency: 0.18 in/day.
What the days between irrigation output means
The result panel emphasizes days between irrigation. Check the input units before judging one scenario against another.
Saving the Irrigation Frequency case
For Irrigation Frequency, preserve Usable root-zone water and Daily crop use and the resulting Days between irrigation.
Mark usable root-zone water as observed or assumed and cite the product label, test, count, or measurement when applicable.
After use, record what happened in the garden on the same basis as days between irrigation.
Usable root-zone water: sensitivity example
In the Irrigation Frequency example, changing Usable root-zone water from 1.4 in to 1.54 in produces 8.56 days rather than 7.78 days. Use the Hose Watering Time tool when watering time needs its own calculation.
Use usable root-zone water only to compare days between irrigation. Compare this result with Leaching Irrigation Volume Calculator when leaching water volume is also needed.
Pair usable root-zone water with Irrigation Frequency site observations.
Clarifying the Irrigation Frequency result
Can Daily crop use be zero in Irrigation Frequency?
In Irrigation Frequency, zero daily crop use makes days between irrigation undefined.
Does Irrigation Frequency adjust itself as crop demand changes?
No. Recalculate days between irrigation after meaningful changes in weather, canopy size, root depth, or irrigated area.
How does “Hot or windy days can shorten the interval.” affect days between irrigation?
Account for it in the source measurement for usable root-zone water; the formula has no additional correction for it.