Utilization of Grey Relation Analysis for evaluation of new dual-purpose(edible and forage)type sweet potato varieties

In order to provide reference for breeding and extension of new sweet potato varieties,an experiment has been conducted to comprehensively evaluate characteristics of eleven new dual-purpose(edible and forage) type sweet potato varieties,which were bred in Guangxi during recent years,on the basis of Grey Relation Analysis(GRA).The sweet potato variety Guishu 2 was used as the check.The descending order of the weighting GRA between eleven tested varieties and the CK variety is as follows: Gui 06-235(0.7857),Gui 06-99(0.6617),Gui 05-192(0.6463),Gui 06-2(0.6259),Gui 05-162(0.6036),Gui 06-49(0.6019),Gui 04-80(0.5699),Gui 05-39(0.5496),Guishu 2(0.5232),Gui 05-197(0.5205),Gui 03-75(0.5030),and Gui 04-167(0.4714).The differences in yield were significant,and there was no difference between the evaluation results and the actual appearance of the varieties.These results revealed that multidi-mensional and comprehensive evaluation method using GRA may be used for evaluating sweet potato varieties.