Comprehensive Evaluation of Rice Varieties in Northern Anhui Based on Grey Correlation Analysis and DTOPSIS Method
[Objective]To select rice varieties suitable for planting in northern Anhui,and to provide a basis for breeding,precise positioning and promotion of new rice varieties.[Method]Two methods of grey correlation analysis and DTOPSIS were applied to comprehensively evaluate the adaptability of 17 rice varieties including 21 characters.The differences among varieties were analyzed and compared.[Result]The gray correlation analysis method and DTOPSIS method could make comprehensively and integrative evaluations of new rice varieties and accurately reflect their advantages and disadvantages of varieties.And the results of the two methods differed.Under the case of giving the same weights,the results of the gray correlation analysis showed that the correlation coefficient εt(k)differed among the participating rice varieties and the ideal variety,and its maximum difference rate was 26.7%.The results of DTOPSIS method analysis showed that the relative proximity factor Gi dif-fered among the participating rice varieties and the ideal variety,and its maximum difference rate was 70.0%.The maximum difference rate was in the order of Gi＞εt(k)＞yield difference.It indicated that the DTOPSIS method could reflect the differences among varieties and reflect the advantages and disadvantages,and was more suitable for the comprehensive evaluation of new rice varieties,comparing to the gray correlation a-nalysis.[Conclusion]The four excellent rice varieties of Yunliangyousimiao,Zanliangyou 570,Yueliangyou 2646 and Yunliangyou 332 had bet-ter adaptability,stability,yield and disease resistance in northern Anhui.And these four varieties could be considered for further test,demonstra-tion and promotion.The DTOPSIS method was a reasonable method to comprehensively evaluate the advantages and disadvantages of new rice varieties in northern Anhui.
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