Establishment of Comprehensive Evaluation Model of Apple Quality for Regional Suitable Varieties Selection

This study was to establish a comprehensive evaluation model of apple quality to provide reference for the introduction,breed reforming and high-quality cultivation of new apple varieties. Based on 13 quality indicators of 20 introduced apple varieties measured in the Jingning production region of Gansu province,the anomaly data was screened by the box chart method,and then the mathematical models for evaluating apple quality were established with the methods of Correlation analysis(CA),Principal component analysis(PCA),Hierarchical cluster analysis(HCA),Analytic hierarchy process(AHP). The core indicators of sugar-acid ratio,organic acid,soluble solids,single fruit weight and fruit shape index were selected from 13 quality indicators with methods of CA,PCA,HCA,and then the comprehensive evaluation model of apple quality was established by AHP as follow:Y(comprehensive value)=0.4276×standardized value of sugar-acid ratio+0.2745×standardized value of organic acid content+0.1759×standardized value of soluble solid content+0.0811×standardized value of weight+0.0409×standardized value of fruit shape index. The comprehensive evaluation results of apple quality showed that the three varieties of Yanfu 3,Chengji 1 and Miyazakifuji had the best quality in Jingning production region,which were consistent with actual production performance. This comprehensive evaluation model of apple quality could effectively improve the scientificity and rationality of apple quality evaluation,and widely used in production practice.