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KMID : 0903619980390020170
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 2 p.170 ~ p.174
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Effects of Foliar Application of CaCl2 on Quality of Netted Muskmelons during Postharvest Storage
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Abstract
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This study was aimed to investigate effects of preharvest treatment of calcium chloride (CaCl₂) on quality of muskmelons during postharvest storage. Netted muskmelons which were grown under greenhouse and applied with two concentrations (0.3% and 0.5%) of CaCl₂ during maturation were stored at 5℃ and 25℃ for 20 days. Changes in qualities during postharvest storage were measured. The loss of fresh weight in the 25℃ storage was the largest (9.25%), followed by 8.4% of 5℃ and CaCl₂ treatments. Though there was no difference in the flesh firmness just after harvest between the control and CaCl₂ treatments, preharvest treatment of CaCl₂ maintained higher flesh firmness during the storage. The soluble solids content in CaCl₂ treatments was increased for 10 days whereas that in the control was increased only for 5 days and then declined. The decreasing rate at 25℃ storage was faster than at 5℃ storage. The calcium contents in mesocarp tissue of control fruit were 120.4 ㎎·㎏^(-1), followed by 136.1 ㎎·㎏^(-1) by 0.3% application and 146.6 ㎎·㎏^(-1) by 0.5% application, which indicated that the CaCl₂ treatment caused a significant increase in fruit Ca contents. Sucrose which showed the most sensitive response in the sugar contents increased for 5 days at 5℃ storage and increased for 10 days at CaCl₂ treatment, suggesting that Ca treatment resulted in slow decrease in sucrose content. There were not much changes in glucose and fructose contents of all treatments which seemed to depend on change of sucrose content. Although the changes in the contents of total sugar showed similiar patterns in all treatments, the contents of total sugar in the 25℃ storage were rapidly decreased during the storage.
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KEYWORD
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