中文摘要：

采用2种不同纸袋于京白梨发育的不同时期进行套袋试验,分析套袋处理对京白梨果实品质的影响。结果表明：不同套袋处理均明显改善京白梨果实的外观品质,但也会使京白梨内在品质有不同程度的降低,包括可溶性糖含量降低,可滴定酸含量增加。其中浅色袋于花后40d套袋效果最好,虽会使京白梨内在品质有少量降低,但可通过相关配套栽培措施加以改善。

英文摘要：

With 2 different types of fruit bags at various development stages,the bagging experiment on Jingbaili pear was conducted.The results indicated that bagging improved significantly appearance qualities;but changed some internal qualities including increasing of titratable acidity content and decreasing of total soluble sugar content.Through comprehensive comparisons,bagging with light color bag at 40 days after flowering was an optimal solution.With the solution,the appearance of the pears was improved significantly,and slightly lower internal quality could also been made up with orchard cultivation and management.