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《Chinese Journal of Eco-Agriculture》 2001-01
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Primary investigation on the relationship between the crop water stress index and the soil moisture.

ZHAO Cheng (Teachers College of Xinyang, Henan Province, Xinyang 464000),LUO Yi,YUAN Guo-Fu,YU Qiang (Institute of Geographical Sciences and Natural Resources,Chinese Academy of Sciences, Beijing 100101),  
Crop water stress index(CWSI) is widely used in determinating irrigation time but seldom in determi-nating irrigation water amount. The objective of this paper is to investigate the relationship between the CWSI and the soil moisture and the possibility of using it to determinate the irrigation water amount. Analysis of the CWSI of the different irrigation treatment plots indicated that CWSI increased with the decrease of soil water content and showed variations caused by fluctuation of the weather factors. The correlation coefficient of CWSI to soil mois-ture content was only 0.54. This indicates that CWSI may not be used reliably for determinnating the irrigation amount.
【Fund】: “九五”中国科学院重大项目(KZ951-A1-301);; 特别支持项目(KZ95T-04—01);; 国家自然科学基金重大(49890330);; 中国科学院禹城综合试验站开放基金
【CateGory Index】: S311
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