Abstract
A crop of chrysanthemums was grown on a lysimeter in a variable shade greenhouse. Measurements were made of evapotranspiration (ET), air velocity, air temperature, air dew point temperature, carbon dioxide concentration, leaf temperature, leaf area, and photosynthetically active and global solar radiation. Comparisons were made between the evapotranspiration of the crop and the predicted water use from a computer model that used temperature, relative humidity, and solar irradiance levels as inputs (the combination model). The ET was studied as a function of vapor pressure deficit (VPD) and solar irradiance levels both separately and together. A relationship between stomatal resistance and solar irradiance levels for chrysanthemums was established.
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