Comprehensive evaluation of new sugarcane varieties(lines) by DTOPSIS method and screening of excellent varieties in Chongzuo, Guangxi

【Objective】A comprehensive evaluation of the agronomic traits, economic traits and resistance of new sugarcane varieties(lines) introduced in Chongzuo, Guangxi was conducted to screen out excellent varieties with a view to optimizing the structure of sugarcane varieties in Chongzuo sugarcane area and providing theoretical references for the demon-stration and promotion of new sugarcane varieties and production in Chongzuo sugarcane area.【Method】Twelve agronomic traits of ten new sugarcane varieties(lines) were evaluated comprehensively by variance analysis and DTOPSIS method, with ROC22 as control and the agronomic traits and economic traits and resistance inone-year plant and two-year ratoon crops were researched, screening out excellent new varieties(lines) suitable for promotion and cultivation in the su garcane area of Chongzuo.【Result】The results showed that among the ten tested varieties(lines), the smut rate of Guitang 08-1375 and Guitang 08-259 reached 13.65% and 9.21% and were significantly higher thancontrol variety ROC22(P< 0.05, same below), the smut rates of other varieties(lines) were lower than ROC22, among which the smut rate of Guitang 08-591 was 0.The lowest cane yield was Guitang 09-2005, only reached 71323.11 kg/ha, the cane yield of other varieties(lines) were higher than ROC22.The lowest sucrose was Guitang 08-1375, only reached 13.36%, the sucrose of other varieties(lines) were higher than ROC22.The lowest sugar yield was Guitang 09-2005, only reached 10565.49 kg/ha, the sugar yields of other varieties(lines) were higher than ROC22.DTOPSIS analysis results showed that C_i in sequence from high to low was Guitang 09-563> Guitang 08-591> SP80-3280> Guitang 09-3990> Guitang 08-1045> Guitang 09-2005> Guinanya 08-212> ROC22.【Conclusion】Guitang 08-1375 and Guitang 08-259 are unfit for planting in Chongzuo sugarcane areas.Guitang 09-2005 and Guinanya 08-212 need followed-up survey.And Guitang 09-563, Guitang 08-591, SP80-3280, Guitang 09-3990 and Guitang 08-1045 are suitable for planting in Chongzuo sugarcane areas.