Monitoring physiological responses to water stress in two maize varieties by infrared thermography

Water stress is one of the main causes of yield reductions in crops, especially in arid and semi-arid regions where the water supply is limited. Plant water status is frequently assessed by pre-dawn leaf water potential (ΨPD) or leaf stomata conductance (gL) measurements, in support of advanced irrigation scheduling. However, both methods are time and labour consuming. A non-invasive approach to water status detection is the use of infrared thermography (IRT). This experiment was conducted in a greenhouse on two potted maize varieties under irrigated and non-irrigated conditions, and the measurements began when the crop had reached its twelve leaf stage. In order to establish the IRT measurements for detecting the water status of maize, an IRT-based crop water stress index (CWSI) was calculated and compared with simultaneously measured ΨPD and gL data. Good correlations were found between CWSI and gL data (r 2 =0.71 & 0.81), as well between CWSI and ΨPD data (r 2 = 0.53 & 0.81). These results highlight the appropriateness of infrared thermal imagery to detect and

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