Agriculture & Soil

Advanced

Crop Water Use (ET)

Crop water demand from a crop coefficient and reference ET.

Formula

ET_c = K_c \times ET_0

Live Calculator

Members

Variables

ET_cCrop evapotranspiration (mm)

K_cCrop coefficient

ET_0Reference ET (mm)

Example

K_c=1.15, ET_0=6 mm: ET_c ≈ 6.9 mm/day

Did You Know?

The crop coefficient rises as a crop grows then falls at ripening — guiding exactly when to irrigate.

agriculture evapotranspiration water

Share this formula

More in Agriculture & Soil

Crop Yield

Production per unit area of land.

Seed Rate

Total seed needed from sowing density and area.

Plant Population

Number of plants from row and plant spacing.

Fertiliser Requirement

Fertiliser product needed to supply a target nutrient rate.

Nutrient from Fertiliser

Actual nutrient delivered by a mass of fertiliser.

Irrigation Water Requirement

Water volume to apply a given depth over a field.