Cabbage Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of cabbage (FAO-56 ETc = ET₀ × Kc, peak Kc 1.05) for your field, climate, soil and irrigation method.
Keep moisture even and frequent through head formation — a dry spell then a heavy irrigation bursts the heads. Drip with mulch is ideal. Reduce watering as heads firm to limit splitting before harvest.
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 Cabbage Water Requirement Calculator to turn the FAO-56 crop coefficients for cabbage into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Cabbage Water Requirement Calculator
Cabbage needs 350–500 mm of steady water and, with shallow roots, splits its heads if moisture swings during head formation. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with cabbage's own crop coefficients (Kc 0.7 initial, 1.05 mid-season, 0.95 late) across a 95-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 Cabbage 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 Cabbage Water Requirement Calculator?
- ✓Uses cabbage'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 cabbage need?+
Cabbage needs 350–500 mm of steady water and, with shallow roots, splits its heads if moisture swings during head formation. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 95-day growth stages for your conditions.
Why do cabbage heads split?+
Uneven moisture — heavy irrigation or rain after a dry spell makes the firm head take up water fast and burst. Even, frequent irrigation through head development and easing off near maturity prevents it.
How much water does cabbage need?+
About 350–500 mm over the season for the shallow-rooted crop, peaking at head formation (Kc ~1.05). Frequent light irrigation suits it better than infrequent heavy watering.
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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