Abstract
Field studies were conducted on differentially irrigated chickpea (cv.J-62) to investigate the potential use of remotely sensed canopy temperature-derived stress degree day (SDD) and crop water stress index (CWSI) to assess crop water stress and to evaluate empirical relationships between canopy temperature, air vapour pressure deficit (VPD) and evapotranspiration (ET). Canopy temperature was measured with a hand-held infrared thermometer; canopy reflectances in red and infrared bands were measured using a handheld radiometer. Soil water content and weather variables were also recorded. Results showed that indices such as SDD and CWSI, along with an IR/Red reflectance ratio, are useful for the assessment of water stress in chickpea. Canopy air temperature differential was inversely related to VPD as well as to ET in both irrigated and unirrigated chickpea.
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