Studies on shelf life enhancement of Kinnow
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Date
2018
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CCSHAU
Abstract
The experiment entitled “Studies on shelf life enhancement of Kinnow” was conducted at farmer‟s field of district Sirsa, Haryana during the years 2015-16 and 2016-17 to enhance the shelf life of fruits by using pre-harvest application of fungicides and plant growth regulators and post-harvest treatments of different chemicals and salicylic acid. The pre-harvest treatments comprising six applications of fungicides and eight applications of plant growth regulators were laid out in a randomized block design with four replications. The post-harvest treatments comprising five applications of salicylic acid and five applications of different chemicals were laid out in a completely randomized block design with four replications. Mature Kinnow fruits of uniform size, bruise and disease free were harvested from all four sides of the Kinnow tree canopy with the help of secateurs. The Kinnow fruits were subjected to washing with chlorine solution (100ppm). The treated fruits were packed in Corrugated Fibre Board boxes with newspaper lining and each replication comprised of four kilogram fruits. The boxes were kept at an ambient temperature and relative humidity in the post-harvest laboratory. The physico-chemical changes in the fruit were recorded at harvest and after five days interval during storage. Spray schedules comprising Copper oxychloride (0.3%) and Carbendazim (0.1%) and Copper oxychloride (0.3%) and Thiophanate methyl (0.1%) proved significantly superior to rest of the fungicides treatments and control in controlling the post-harvest fruit decay. The microbial counts were found significantly lowest in Copper oxychloride (0.3%) and Carbendazim (0.1%) followed by Copper oxychloride (0.3%) and Mancozeb (0.2%) as compared to control. The quality parameters viz., total soluble solids (TSS), acidity, physiological loss in weight (PLW), total sugars, reducing sugars, fruit firmness and ascorbic acid were found non-significant with different fungicides treatments as compared to control. The fruits treated with Salicylic acid (3.0mmol/L) and Salicylic acid (2.5mmol/L) minimizes the PLW and decay loss and retains fruit firmness as compared to control. The microbial counts were found significantly lowest in Salicylic acid (3.0mmol/L) followed by Salicylic acid (2.5mmol/L) as compared to control under ambient storage condition. The quality parameters viz., TSS, acidity, total sugars, reducing sugars and ascorbic acid were found non-significant with different treatments as compared to control. Plant growth regulators exhibited significant effects on fruit quality of Kinnow fruits. Plant growth regulators viz., GA3 (20ppm) and Kinetin (25ppm) was more effective for prolonging the shelf life and minimizing the physiological loss in weight and decay loss of Kinnow fruits under ambient storage conditions. Plant growth regulators positively affect reducing sugar, acidity and fruit firmness except total soluble solids, ascorbic acid and juice content, but higher value was recorded in plant growth regulators treated fruits as compared to un-treated fruits. The fruits treated with Citrashine and Stafresh coatings significantly minimize the PLW and decay loss and retains the firmness, TSS, vitamin C and reducing sugar and total sugar as compared to control during the ambient storage. Hence, it can be visualized from the data that Citrashine and Stafresh coated fruits can be marketed for about 25 days under ambient storage condition.
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