Delayed Girdling Treatment Affects the Quality of Crimson Seedless Grapes
High-quality fresh Crimson seedless grapes were used as test material to investigate the effects of a single girdling and a delayed gir-dling intervention compared to conventional cultivation practices.The experiments were done from July 28 to September 17,with sampling every 10 days-totaling six collections.Parameters such as berry weight,berry diameter,fruit shape index,color difference for external indicators,and soluble solids,titratable acidity,vitamin C,as well as sugar-acid ratio for internal quality indicators were measured.The aim was to provide a theoretical basis for the application of early ripening and quality improvement cultivation techniques for Crimson seedless grapes in the Xinjiang production region.Results indicated that delayed girdling did not significantly affect the grape fruit shape index,whereas a single girdling treat-ment significantly increased the weight per berry without affecting the berry weight with delayed girdling.Both treatments significantly enhanced the accumulation of soluble solids and improved the sugar-acid ratio,facilitating fruit maturation.There were significant differences in sugar-acid composition and content ratios among the treatments,with glucose and fructose contents being the highest in the initial girdling treatment.The single girdling significantly increased sugar content.Delayed girdling showed a marked trend in accelerating the decline of tartaric,malic,and citric acid contents,while single girdling reduced the oxalic acid content.Both girdling treatments significantly increased the VC content of Crim-son grapes,verifying that delayed girdling markedly enhances the VC content.In terms of girdling treatments at different stages,delayed girdling noticeably improved the coloring of Crimson grapes,increased brightness,and promoted red coloration in the fruit.
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