| Using 15 starch sweetpotato varieties as test materials, the grey correlation method and DTOPSIS method were used to comprehensively evaluate and analyze eight agronomic traits of starch sweetpotato cultivated in Zhengzhou. The results showed that there were significant differences in eight agronomic traits among the 15 starch sweet potato varieties, with a coefficient of variation of 13.36% to 92.01%. The top three varieties in yield were Hami, Shangshu 19, and Xushu 37; Relevant analysis showed that there was a significantly positive correlation between yield and commodity rate, and a significantly positive correlation between branch number per plant and commodity rate. The influence order of seven agronomic traits on yield of starch sweetpotato was commodity rate>stem diameter>branch number per plant>dry matter>leaf area>longest vine length>tuber number per plant. The results of DTOPSIS analysis showed that the the top three comprehensive rankings were consistent with the ranking of the top three in yield, with only four sweetpotato varieties having changes in the ranking, and the rest were consistent with the ranking of fresh sweetpotato yield. In summary, the DOTPSIS method can be used as a comprehensive evaluation method for starch sweetpotato varieties, and Hami, Shangshu 19, and Xushu 37 can be selected as new varieties for demonstration and extension in Zhengzhou. |
