FAO-56 Reference evapotranspiration
Estimates standard grassland reference evapotranspiration based on daily meteorological conditions.
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Agronomy & MeteorologyFormulas
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Crop evapotranspiration coefficient method
uses the crop coefficient to convert reference evapotranspiration into crop water demand.
View formula explanationWater vapor pressure deficit
measures the water vapor pressure difference between the relative saturated state of the air.
View formula explanationgrowing degree days
approximates the growth process by the daily accumulated temperature higher than the base temperature.
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Reference: FAO Irrigation and Drainage Paper 56 ↗
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