Groundnut Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of groundnut (FAO-56 ETc = ET₀ × Kc, peak Kc 1.15) for your field, climate, soil and irrigation method.
Protect flowering, pegging and pod-development from moisture stress; these decide pod number and fill. Sprinkler suits groundnut's spreading habit. Avoid heavy irrigation at maturity, which causes pod sprouting.
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 Groundnut Water Requirement Calculator to turn the FAO-56 crop coefficients for groundnut into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Groundnut Water Requirement Calculator
Groundnut needs 500–700 mm and is acutely sensitive to drought at pegging and pod development — the stages that fill the pods. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with groundnut's own crop coefficients (Kc 0.4 initial, 1.15 mid-season, 0.6 late) across a 130-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 Groundnut 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 Groundnut Water Requirement Calculator?
- ✓Uses groundnut'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 groundnut need?+
Groundnut needs 500–700 mm and is acutely sensitive to drought at pegging and pod development — the stages that fill the pods. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 130-day growth stages for your conditions.
When is groundnut most sensitive to drought?+
From flowering through pegging and pod development — roughly 40–90 days. Stress then directly reduces pegs that enter the soil and pods that fill, the main yield drivers. Early and very late stages are more tolerant.
What irrigation method suits groundnut?+
Sprinkler suits its low spreading canopy and gives even coverage; in drip systems, lateral spacing must match the pegging zone. The key is avoiding both stress at pegging and waterlogging, which causes rots.
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.
Related Agri tools
Tractor Fuel Consumption Calculator
Estimate your tractor's diesel consumption per hour from its horsepower, load and specific fuel consumption.
● LiveTractor Fuel Cost Per Acre Calculator
Convert your tractor's fuel use per hour into diesel litres and cost per acre for any field operation.
● LiveImplement Field Capacity Calculator
Calculate the effective field capacity (ha/h and acres/h) of any implement from width, speed and field efficiency.
● Live