Isabgol Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of isabgol (psyllium) (FAO-56 ETc = ET₀ × Kc, peak Kc 0.95) for your field, climate, soil and irrigation method.
Light irrigation through growth, but absolutely no irrigation (or rain) near maturity — wetting the ripening spikes ruins the valuable husk. Grown on light soils in dry Gujarat–Rajasthan 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 Isabgol Water Requirement Calculator to turn the FAO-56 crop coefficients for isabgol (psyllium) into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Isabgol Water Requirement Calculator
Isabgol is a low-water rabi crop needing 250–350 mm, with a strict no-water rule near maturity to protect the husk. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with isabgol (psyllium)'s own crop coefficients (Kc 0.4 initial, 0.95 mid-season, 0.3 late) across a 105-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 Isabgol 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 Isabgol Water Requirement Calculator?
- ✓Uses isabgol (psyllium)'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 isabgol (psyllium) need?+
Isabgol is a low-water rabi crop needing 250–350 mm, with a strict no-water rule near maturity to protect the husk. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 105-day growth stages for your conditions.
Why must isabgol not be watered near harvest?+
The economic product is the seed husk, which is damaged by moisture at ripening. Rain or irrigation on mature spikes causes seed shattering and husk loss, so the crop is finished bone-dry.
How much water does isabgol need?+
Only 250–350 mm over its short rabi season on light soils. Careful light irrigation early, then a strictly dry finish, defines the crop's water management.
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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