This article is based on the thesis, that when sun radiation is not in excess and advected energy supply can be neglected, then for periods of plant cover and growth, both evapotranspiration and plant production are linearly and strongly related to global radiation.

The regression coefficients will depend also on plant, soil and other climatic factors, but global radiation will be the dominating factor for potential evapotranspiration and potential plant production in given regions.

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