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| Temperature | Temperature
 +| Maximum and minimum temperature
 +| Some ET<sub>0</sub> calculation methods use average temperature only. AgrometShell needs both minimum and maximum temperatures.
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 +|-
 +| Radiation (MJ/m<super>2</super>
| Maximum and minimum temperature | Maximum and minimum temperature
| Some ET<sub>0</sub> calculation methods use average temperature only. AgrometShell needs both minimum and maximum temperatures. | Some ET<sub>0</sub> calculation methods use average temperature only. AgrometShell needs both minimum and maximum temperatures.

Revision as of 08:25, 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.
Radiation (MJ/m<super>2</super> 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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