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The parameters needed to calculate ET<sub>0</sub> are the following: The parameters needed to calculate ET<sub>0</sub> are the following:
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Revision as of 08:23, 4 August 2006

Chapter 11. Development of ET0 computation procedure.

Potential evapotranspiration (ET0) is a vital input to Water Balance calculations, which in turn are a vital part in Crop forecasting.

The parameters needed to calculate ET0 are the following:

Parameter group Parameters Remarks
Temperature Maximum and minimum temperature Some ET0 calculation methods use average temperature only. AgrometShell needs both minimum and maximum temperatures.


  • Temperatures : minimum and maximum in degrees celcius
  • Radiation. Radiation can be calculated quite accurately from the number of sunshine hours (or sunshine fraction) accompanied by Day number in the year





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