Tobacco Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of tobacco (FAO-56 ETc = ET₀ × Kc, peak Kc 1.1) for your field, climate, soil and irrigation method.
Even moisture builds leaf early; ease water as leaves ripen so they mature evenly for curing. FCV tobacco quality depends on a controlled, slightly dry finish — over-irrigation late gives thin, washed-out leaf.
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 Tobacco Water Requirement Calculator to turn the FAO-56 crop coefficients for tobacco into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Tobacco Water Requirement Calculator
Tobacco needs 400–600 mm, and controlled water near maturity is part of producing the ripe, even leaf that cures well. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with tobacco's own crop coefficients (Kc 0.5 initial, 1.1 mid-season, 0.8 late) across a 120-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 Tobacco 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 Tobacco Water Requirement Calculator?
- ✓Uses tobacco'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 tobacco need?+
Tobacco needs 400–600 mm, and controlled water near maturity is part of producing the ripe, even leaf that cures well. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 120-day growth stages for your conditions.
How much water does tobacco need?+
About 400–600 mm over the season, peaking during rapid leaf growth. A controlled, drier finish near maturity helps the leaf ripen evenly for curing — important for quality grades, especially FCV tobacco.
Does irrigation affect tobacco leaf quality?+
Yes — even moisture during leaf growth builds body, but excess water late produces thin, pale, poorly-curing leaf. A controlled finish is part of the quality recipe alongside nutrition and topping.
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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