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《Journal of South China Agricultural University》 2007-03
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Comparisons Between the Empirical and Theoretical Models Based on Canopy Temperature for Monitoring Water Stress of Summer Maize

YU Long1,WANG Wei-xing1,CUI Xiao2,SUN Dao-zong1(1 College of Engineering,South China Agric.Univ.,Guangzhou 510642,China;2 Guangdong Baiyun Institute,Guangzhou 510450,China)  
By analyzing crop water stress index(CWSI) for monitoring water stress with both Idso's empirical model and Jackson's theoretical model applied in summer maize in North China Plain,the CWSI variations and relationship between soil water content,leaf water potential and the empirical theoretical CWSI models were studied.The results showed that the values of empirical CWSI model were below the range of 0-1 frequently while the values of theoretical mode seldom behave so,and the daytime variation of the empirical CWSI model based on canopy temperature was bigger than that of the theoretical model.The CWSI models could be used for guiding irrigation schedule while the theoretical model was more reasonable due to its more interrelations with summer maize leaf water potential.
【Fund】: 国家863计划节水农业专项子课题(2002AA2Z4071-02);; 广东省自然科学基金(032272)
【CateGory Index】: S423;S513
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