The water stress detection system of winter wheat and summer maize

Based on the field experimental data of winter wheat and summer maize,the variation of leaf water potential and canopy-temperature discrepancy was analyzed and used as the index of water stress.This index could vary with growing season and the characteristics of variation was considered. The relationship between leaf water potential, canopy-temperature discrepancy and soil water content was found, and then the detection system of crop water stress was set up.