Abstract
Experiments were conducted on bell pepper plants at Phoenix, AZ to determine the effects of different air temperature ( T A) and vapor pressure deficit ( VPD) measurement sites on the evaluation of non-water-stressed baselines needed for the remote assessment of plant water stress via infrared thermometry. For well-watered plants having a baseline slope in the vicinity of −1.9°C kPa −1, it was found that the location of the T A and VPD measurement site had little effect on baseline determination. Different T A and VPD data sets merely defined overlapping portions of a single common line, owing to site differences in T A being accompanied by compensatory changes in air VPD.
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