Late-sown wheat Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of late-sown wheat (FAO-56 ETc = ET₀ × Kc, peak Kc 1.15) for your field, climate, soil and irrigation method.
The shortened season means fewer irrigations, but the grain-fill irrigation under rising March heat is critical to limit shrivelling. Light frequent irrigation helps cool the canopy at the heat-stressed finish.
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 Late-sown wheat Water Requirement Calculator to turn the FAO-56 crop coefficients for late-sown wheat into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Late-sown wheat Water Requirement Calculator
Late-sown wheat needs 350–450 mm in a shorter season and is especially vulnerable to terminal-heat stress at grain-fill. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with late-sown wheat's own crop coefficients (Kc 0.4 initial, 1.15 mid-season, 0.4 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 Late-sown wheat 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 Late-sown wheat Water Requirement Calculator?
- ✓Uses late-sown wheat'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 late-sown wheat need?+
Late-sown wheat needs 350–450 mm in a shorter season and is especially vulnerable to terminal-heat stress at grain-fill. 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.
How is irrigation different for late-sown wheat?+
The season is shorter, so total water (350–450 mm) and the number of irrigations drop, but the grain-fill irrigation becomes more critical because the crop fills under rising terminal heat.
Can irrigation reduce terminal heat damage in wheat?+
Partly — a well-timed grain-fill irrigation cools the canopy and sustains fill during the hot finish, limiting the shrivelled grain that terminal heat causes in late-sown crops.
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