Sweet potato Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of sweet potato (FAO-56 ETc = ET₀ × Kc, peak Kc 1.1) for your field, climate, soil and irrigation method.
Keep moisture even through vine and tuber development; ease water in the final 2–3 weeks so roots firm and store well. Excess late water cracks tubers and delays maturity.
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 Sweet potato Water Requirement Calculator to turn the FAO-56 crop coefficients for sweet potato into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Sweet potato Water Requirement Calculator
Sweet potato needs 500–700 mm of steady moisture for tuber bulking, then a dry finish to firm the roots. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with sweet potato's own crop coefficients (Kc 0.5 initial, 1.1 mid-season, 0.65 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 Sweet potato 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 Sweet potato Water Requirement Calculator?
- ✓Uses sweet potato'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 sweet potato need?+
Sweet potato needs 500–700 mm of steady moisture for tuber bulking, then a dry finish to firm the roots. 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 sweet potato need?+
About 500–700 mm over the season, peaking during tuber bulking. A drier finish firms the roots for storage and prevents cracking.
When should I reduce water on sweet potato?+
In the final 2–3 weeks before harvest. Heavy late irrigation cracks tubers, delays maturity and worsens storage; a controlled dry finish improves quality.
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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