Correlation Analysis of Chlorophyll SPAD Value, Root Yield and Rate of Sugar Content in Difference Sugar Beet Varieties

【Objective】 To analyze the correlation of chlorophyll SPAD value and sugar content and root yield in root expansion stage and sugar accumulation stage, so as to provide theoretical reference for the promotion and planting of beet varieties. 【Methods】 The relative chlorophyll contents during yield at root expansion stage and sugar accumulation stage of sugar beet were tested by the SPAD-502 PLUS, and the sugar content and yield of beetroot were measured after ripening. 【Results】 The negative correlation between chlorophyll SPAD value and sugar content,Correlation coefficient -0.591.The correlation between chlorophyll SPAD value and yield per root,Correlation coefficient 0.279.The negative correlation between sugar contentand and yield per root,Correlation coefficient -0.413. 【Conclusion】 High yield of root index is better than high sugar content index in sugar beet breeding and cultivation variety selection, and increasing the yield of root is the main way to increase the sugar yield of sugar beet, and chlorophyll SPAD value can be used as reference selection index.