Arecanut Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of arecanut (FAO-56 ETc = ET₀ × Kc, peak Kc 1) for your field, climate, soil and irrigation method.
Areca's shallow roots need frequent dry-season irrigation (sprinkler or drip) — a long dry stress drops buttons and nuts. In mixed gardens, the palm and intercropped pepper share the water.
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 Arecanut Water Requirement Calculator to turn the FAO-56 crop coefficients for arecanut into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Arecanut Water Requirement Calculator
Arecanut palms need 1500–2000 mm well distributed and shallow roots that demand frequent dry-season irrigation. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with arecanut's own crop coefficients (Kc 0.9 initial, 1 mid-season, 1 late) across a 365-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 Arecanut 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 Arecanut Water Requirement Calculator?
- ✓Uses arecanut'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 arecanut need?+
Arecanut palms need 1500–2000 mm well distributed and shallow roots that demand frequent dry-season irrigation. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 365-day growth stages for your conditions.
How much water does arecanut need?+
About 1500–2000 mm a year, well distributed. Its shallow root system gives it little drought buffer, so frequent dry-season irrigation is essential to retain buttons and nuts.
What irrigation suits arecanut?+
Sprinkler or drip giving frequent dry-season water; the shallow roots concentrate near the surface in a small basin, often shared with intercropped pepper or banana in multi-storey gardens.
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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