Abstract
Canopy temperature of irrigated grain sorghum [Sorghum bicolor (L.) Moench] was monitored using an infrared thermometer during short-term changes in solar radiation. Canopy temperature is defined as the blackbody temperature that would produce the same radiation level that enters the instrument field-of-view from the crop canopy. Canopy temperature fluctuations of 3° C within 3 min were observed. These fluctuations followed closely the fluctuation in solar radiation. Due to the sudden changes in canopy temperature caused by radiation changes, care should be taken when attempting to estimate canopy temperature using infrared thermometry on days of variable radiation. The data indicated that on the descent portion of a radiation change approximately 1 to 2 min were required for near steady-state canopy temperature. Less time was required for steady-state conditions on the ascent portion of a radiation change.
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