Mustard Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of mustard (FAO-56 ETc = ET₀ × Kc, peak Kc 1.1) for your field, climate, soil and irrigation method.
Where water is scarce, one irrigation at flowering (~40–45 days) gives the biggest response; a second at siliqua (pod) development helps. Mustard's deep roots let it finish on residual moisture in many tracts.
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 Mustard Water Requirement Calculator to turn the FAO-56 crop coefficients for mustard into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Mustard Water Requirement Calculator
Mustard needs just 250–400 mm and often gives its best response to a single well-timed irrigation at flowering. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with mustard's own crop coefficients (Kc 0.35 initial, 1.1 mid-season, 0.35 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 Mustard 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 Mustard Water Requirement Calculator?
- ✓Uses mustard'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 mustard need?+
Mustard needs just 250–400 mm and often gives its best response to a single well-timed irrigation at flowering. 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.
When is the most critical irrigation for mustard?+
Flowering, at about 40–45 days. If you can give only one irrigation, give it then — it lifts yield more than any other single watering. A second at pod/siliqua development adds further.
How much water does mustard need?+
Only about 250–400 mm — mustard is a low-water rabi oilseed with deep roots. The calculator sums ET₀ × Kc across its short season and suggests how to place your limited irrigations.
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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