Much of the work relating canopy temperature to crop water stress has been done in the U. S. A. The leaf-based measurements are time consuming when the fields of the size larger. The measurement of canopy temperature using infrared themometer is the most promising approach to irrigation scheduling. In this paper, three indices were examined. The first index used only canopy-air temperature differentials. The secound index used canopy-air temperature differentials and vapor pressure dificits. The third index used crop water stress index(CWSI). These three indices were evaluated the applicability to irrigation scheduling. The canopy temperature are simulated for progressive soil drying using the continuity equation for water flux in the soil-plant-atmosphere system. With this model, characteristic features of these three indecies were mathematically examined.
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