Litchi Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of litchi (FAO-56 ETc = ET₀ × Kc, peak Kc 0.85) for your field, climate, soil and irrigation method.
Keep moisture even through fruit set and development to limit cracking and drop; mulch heavily. A cool, dry winter rest aids flowering — avoid heavy winter irrigation.
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 Litchi Water Requirement Calculator to turn the FAO-56 crop coefficients for litchi into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Litchi Water Requirement Calculator
Litchi needs 800–1000 mm, with even moisture during fruit development critical to prevent the cracking and fruit drop it is prone to. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with litchi's own crop coefficients (Kc 0.5 initial, 0.85 mid-season, 0.7 late) across a 300-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 Litchi 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 Litchi Water Requirement Calculator?
- ✓Uses litchi'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 litchi need?+
Litchi needs 800–1000 mm, with even moisture during fruit development critical to prevent the cracking and fruit drop it is prone to. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 300-day growth stages for your conditions.
How do I reduce litchi fruit cracking?+
Even moisture through fruit development (drip plus mulch) and avoiding drought-then-rain swings. Cracking and fruit drop spike when a dry spell is broken by heavy water at colour-break.
Should litchi be irrigated in winter?+
Sparingly — a cool, dryish winter rest helps flower initiation. Heavy winter irrigation can push vegetative growth at the cost of flowering.
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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