How much water does your crop really need? Free FAO-56 calculators give the litres, the schedule and the savings.
Work out the seasonal and per-irrigation water requirement of rice (awd water-saving) (FAO-56 ETc = ET₀ × Kc, peak Kc 1.05) for your field, climate, soil and irrigation method.
Work out the seasonal and per-irrigation water requirement of drip vs flood comparison (FAO-56 ETc = ET₀ × Kc, peak Kc 1.1) for your field, climate, soil and irrigation method.
Work out the seasonal and per-irrigation water requirement of wheat (FAO-56 ETc = ET₀ × Kc, peak Kc 1.15) for your field, climate, soil and irrigation method.
Work out the seasonal and per-irrigation water requirement of sugarcane (FAO-56 ETc = ET₀ × Kc, peak Kc 1.25) for your field, climate, soil and irrigation method.
Work out how long to run a drip system to apply a target water depth, from emitter discharge and spacing.
Estimate reference evapotranspiration ET₀ from temperature alone using the FAO Hargreaves equation — the base for any crop water requirement.
Work out the seasonal and per-irrigation water requirement of cotton (FAO-56 ETc = ET₀ × Kc, peak Kc 1.18) for your field, climate, soil and irrigation method.
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