Marigold Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of marigold (FAO-56 ETc = ET₀ × Kc, peak Kc 1) for your field, climate, soil and irrigation method.
Keep moisture even through budding and flowering — stress drops buds and shrinks blooms. Drip with mulch keeps flowers clean and the picking season long. Avoid wetting flowers.
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 Marigold Water Requirement Calculator to turn the FAO-56 crop coefficients for marigold into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Marigold Water Requirement Calculator
Marigold needs 400–550 mm of steady moisture through its long, continuous flowering for loose-flower markets. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with marigold's own crop coefficients (Kc 0.5 initial, 1 mid-season, 0.8 late) across a 90-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 Marigold 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 Marigold Water Requirement Calculator?
- ✓Uses marigold'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 marigold need?+
Marigold needs 400–550 mm of steady moisture through its long, continuous flowering for loose-flower markets. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 90-day growth stages for your conditions.
How much water does marigold need?+
About 400–550 mm over the season, with steady demand through continuous flowering. Even moisture maximises bloom number and size for the loose-flower trade.
Why are my marigold blooms small?+
Moisture or nutrient stress during budding shrinks flowers and drops buds. Steady drip irrigation through the picking season keeps blooms full-sized.
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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