Cashew Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of cashew (FAO-56 ETc = ET₀ × Kc, peak Kc 0.85) for your field, climate, soil and irrigation method.
Cashew survives on poor laterite soils with little water via deep roots, but drip irrigation during flowering and nut development (the dry season) can double yields. Avoid waterlogging.
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 Cashew Water Requirement Calculator to turn the FAO-56 crop coefficients for cashew into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Cashew Water Requirement Calculator
Cashew is drought-hardy, needing only 600–800 mm, but supplementary irrigation at flowering and nut-set sharply lifts yield. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with cashew's own crop coefficients (Kc 0.5 initial, 0.85 mid-season, 0.65 late) across a 330-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 Cashew 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 Cashew Water Requirement Calculator?
- ✓Uses cashew'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 cashew need?+
Cashew is drought-hardy, needing only 600–800 mm, but supplementary irrigation at flowering and nut-set sharply lifts yield. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 330-day growth stages for your conditions.
Is cashew drought tolerant?+
Yes — its deep roots let it survive on 600–800 mm on poor laterite slopes. But it is not drought-indifferent: dry-season irrigation at flowering and nut-set can dramatically raise yield.
When does irrigating cashew help most?+
During flowering and nut development, which fall in the dry season. Drip irrigation then prevents flower and nut drop and can double the yield of otherwise rain-fed trees.
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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