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Research on Water Requirement Rule and Crop Coefficient of Spinach under Facility Cultivation

YE Lan-tao1,2,PENG Shi-zhang1,WANG Yang-ren2,SUN Shu-hong2,XU Jun-zeng1(1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,NanJing 210098,China;2.Department of Hydraulic Engineering,Tianjin Agicultural University,Tianjin 300384,China)  
According to the data of vegetable water requirement experiment under facility cultivation,the water requirement rules and cumulative water requirement rules of spring spinach and winter spinach under facility cultivation are analyzed and their crop coefficients are calculated through single coefficient approach recommended by FAO-56 in this paper.Moreover,the change rules of two kinds of crops in whole growing stage are analyzed,and the crop coefficients are amended in course according to the growth stage from Logistic curve and in value through weather parameters.The results indicate that water requirement of spinach under facility cultivation increases at first and then decreases,while cumulative water requirement shows the rule of slow to fast to slow,which is accorded with the Logistic curve,the change rule of crop coefficient is similar to the water requirement,and the crop coefficient after course and value amended is more coincident with the measured value.
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