Fennel Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of fennel (saunf) (FAO-56 ETc = ET₀ × Kc, peak Kc 1) for your field, climate, soil and irrigation method.
Fennel needs steady moisture across its long season; protect flowering and seed-fill from stress for plump seed. Light frequent irrigation on light soils; avoid waterlogging that invites blight.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Farmers and irrigation planners use the free Fennel Water Requirement Calculator to turn the FAO-56 crop coefficients for fennel (saunf) into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Fennel Water Requirement Calculator
Fennel is a long-duration rabi spice needing 400–550 mm, with even moisture through umbel and seed development. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with fennel (saunf)'s own crop coefficients (Kc 0.4 initial, 1 mid-season, 0.35 late) across a 140-day season. Pick your climate band (which sets reference ET₀), irrigation method (drip, sprinkler, pivot or surface — each with its own efficiency) and soil texture, and it returns the seasonal water need in cubic metres, the peak daily demand, the net depth per irrigation and how many days to wait between irrigations.
How to use Fennel Water Requirement Calculator
- 1Enter your field area and choose the climate band matching your season.
- 2Select your irrigation method and soil texture.
- 3Read the seasonal water volume, peak daily demand and irrigation interval, then follow the scheduling note.
Why use Fennel Water Requirement Calculator?
- ✓Uses fennel (saunf)'s real FAO-56 Kc curve, not a flat factor
- ✓Accounts for drip / sprinkler / pivot / surface efficiency
- ✓Gives seasonal volume, peak daily need and an irrigation interval
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How much water does fennel (saunf) need?+
Fennel is a long-duration rabi spice needing 400–550 mm, with even moisture through umbel and seed development. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 140-day growth stages for your conditions.
How much water does fennel need?+
About 400–550 mm over its long rabi season. Even moisture through umbel formation and seed development gives plump, aromatic seed.
When is fennel most sensitive to water stress?+
During flowering (umbel formation) and seed development. Stress then shrivels seed and cuts yield and oil; keep moisture steady through these stages.
What is ET₀ and Kc?+
ET₀ (reference evapotranspiration) is how fast a standard grass surface loses water in your climate. Kc (crop coefficient) scales it to a specific crop and growth stage. Crop water use ETc = ET₀ × Kc — the basis of FAO-56 irrigation scheduling.
Is this calculator free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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