Effect of pre-harvest sprays of ascorbic acid and calcium chloride on fruit quality and storage life of Flame Seedless grapes (Vitis vinifera L

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Date
2013
Authors
Niraj Kumar
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Punjab Agricultural University
Abstract
The present investigations entitled “Effect of pre-harvest sprays of ascorbic acid calcium chloride on fruit quality and storage life of Flame Seedless grapes (Vitis vinifera L.)” were carried out in the New Orchard and Post-harvest Laboratory, Department of Fruit Science, Punjab Agricultural University, Ludhiana during 2012. To improve quality and storage life the pre-harvest prays of ascorbic acid and calcium chloride was given at fruit-set and veraison stage in treatment T1 to T6. The treatment T7 (Bunch thinning + GA3 40ppm) and T8 (75% crop load + Ethephon at verasion @ 400ppm) were also included for comparison. The fruits were harvested at fully ripe stage and brought to laboratory for ascertaining the effect on fruit quality and packaging in CFB boxes (2 kg) lined with LDPE having half sheet of sulphur dioxide generating pad for storage study. The time of ripening was advanced by 5-days in the treatment T8 (crop load 75% + ethephon 400 ppm) as compared to control, while in the treatment T7, in which bunch thinning + gibberellic acid 40 ppm was applied time of ripening was advanced by 3-days.The treatment T7 i.e. bunch thinning + gibberellic acid resulted in significantly higher yield (33.54 kg/vine) followed by treatment T8 (75 % crop load + Ethephon 400 ppm) which was recorded 31.05 kg fruit yield per vine. Likewise, improved fruit quality w.r.t to higher total soluble solids (TSS), lower acidity, higher sugars and anthocyanin content was also recorded in treatment T8 (75 % crop load + Ethephon 400 ppm).In the storage studies, the lowest mean PLW (3.54%) and berry shattering (8.43 %) was recorded in treatment T7 i.e. bunch thinning + gibberellic acid 40 ppm. The treatments in which 75 per cent crop load and 400 ppm ethephon was sprayed recorded maximum (8.00) mean palatability rating, followed by 7.87 palatability score found in treatment (T7) subjected to bunch thinning + GA3 (40 ppm) at the end of storage period. The TSS: acid ratio increased with the advancement in storage period. The highest mean TSS: acid ratio of 42.85 was recorded in treatment T8, i.e. crop load (75 %) + 400 ppm ethephon. The TSS: acid ratio mean was lowest (20.55) in control T9. The present study suggests that the pre-harvest application of 75 per cent crop load + ethephon (@ 400ppm at veraison) should be given for improvement in fruit quality and advancement in ripening in Flame Seedless grapes. While, for extending the storage life vines should be subjected to pre-harvest application of bunch thinning and application of GA3 @ 40 ppm at fruit-set and one week after fruit-set.
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proteins, rice
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