Early, noncontact, nondestructive, and quantitative detection of plant water stress with the application ofinfrared thermometry using a crop water stress index (CWSI) was established. A CWSI model for plants grown undercontrolled environments was developed using thermodynamic principles and energy balance of the plant. CWSI thresholdvalues were established with a parametric approach. The effectiveness of the sensing technique was evaluated using timingof the stress detection by a grower. The CWSIbased technique was able to detect the stress one to two days prior to the timeof stress detection by visual observation. Overall results of this study suggested that previsual and noncontact detectionof plant water stress with infrared thermometry application using CWSI is feasible.
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Kaçıra et al. (2002) studied this question.