the past decades, lightweight, hand-held, portable, and battery operated infrared thermometers (IRT) became Corn (Zea mays L.) grown under a Mediterranean semiarid climate available. Infrared thermometers can rapidly measure requires supplemental irrigation to maximize the grain yield. Since the cost of irrigation application has been increasing, elimination of canopy temperatures over large areas. The theory of unnecessary irrigation applications would improve economics of corn IRT operation (Fuchs and Tanner, 1966; Fuchs et al., production. There has been much interest in the crop water stress 1967; Hatfield, 1990; Gardner and Shock, 1989); and index (CWSI) as a potential tool for irrigation scheduling and yield (Gardner et al., 1992a) and temperature effects in infraestimation. An experiment was conducted to monitor and quantify red thermometry (Jackson and Idso, 1969) have been water stress, and to develop parameters for irrigation scheduling and discussed. In the 1980s, the use of IRT become more grain yield of summer-grown corn as a function of CWSI under Mediroutine in irrigation scheduling when Idso et al. (1981a) terranean semiarid cropping conditions. Three irrigation treatments developed and demonstrated an empirical method for were based on replenishing the 0.9-m deep root zone to field capacity using the crop water stress index (CWSI). when the soil water level dropped to 25, 50, and 75% of available Idso et al. (1981a) observed a linear relationship bewater holding capacity (AWHC). A dryland treatment was also included. The lower (nonstressed) and upper (stressed) baselines were

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