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Crop Canopy Temperature as an Index for Assessing Quantitatively Water Status of Cotton and Corn Mulched with Plastic Film

CWSI and canopy air temperature difference ( T c T a ) are two important indexes, related with crop canopy temperature, for assessing crop water status. A field experiment was conducted to determine suitable CWSI and ( T c T a ) values for assessing water status of cotton and corn mulched with plastic film in 1998 and 1999. The results showed that CWSI was a good indicator of moisture in root zone, and ( T c T a ) was influenced by many environment factors, such as solar radiation, and vapor pressure deficit. Moreover, the utilization of NDT (Normalized Difference of Temperature) for assessing quantitatively water status of cotton and corn mulched with plastic film also was studied. Research results showed that influences of environment factors can be minimized significantly with adapting NDA as index, and NDA is a good index for assessing water status in root zone soil. The critical values of CWSI and NDT for assessing water status at each growth stage of cotton and corn mulched with plastic film also were determined with experiment data.