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2016 - 20192
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Subject: Horticulture × Author: Ankit Kumar × Type: Thesis ×
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    ThesisItemOpen Access
    Studies on fruit development and determination of maturity indices in ber (Zizyphus mauritiana Lamk.) cultivars under Tarai region
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Ankit Kumar; Singh, Omveer
    The present investigation “Studies on fruit development and determination of maturity indices in ber (Zizyphus mauritiana Lamk.) cultivars under Tarai region” was conducted on existing 40 years old ber orchard at Horticulture Research Centre, Patharchatta, G. B. Pant University of Agriculture & Technology, Pantnagar, U.S. Nagar, Uttarakhand, India during the cropping season of 2017-18 and 2018-19. Eight ber cultivars viz., Chhuhara, Chinese, Kalagola, Nazuk, Sanaur-2, Sanaur-4, Umran and ZG-2 were selected for the study. Three trees per cultivar were selected, each of which was considered as a replication. The experiment was laid out in two factor Randomized Block Design (RBD) with three replications. Sampling dates and cultivars were considered as the treatments. There were 11 sampling dates commences at 28 days after full bloom (DAFB) to 168 DAFB and observations were taken at biweekly interval for determining the changes in growth pattern and quality attributes in ber cultivars. During the last two months of maturity the fruit samples were picked at a narrow interval of 7 (weekly) days from 112 DAFB so as to fix up the appropriate maturity indices under tarai conditions in terms of their biochemical and functional attributes while sensory attributes were judged from 126 DAFB. Twenty fruits at every sampling date from each tree were plucked randomly from all directions of the tree collected in a polyethylene bags and carried to the postharvest laboratory of the Department of Horticulture and analyzed for physical, biochemical and functional characteristics on the day of harvesting. Significant differences in terms of physical, computational, bio-chemical, functional and sensory quality attributes were observed among the ber cultivars during the span of study. Finding of the study showed a characteristic double sigmoid growth pattern in terms of fruit size, weight, volume, flesh: stone ratio and TSS in most of the cultivars. On the basis of various physico-chemical, functional and sensory quality attributes, most of the cultivars attained their physiological/horticultural harvest maturity at 154 to 168 days after full bloom except Nazuk and ZG-2 which got their harvest maturity at 140 DAFB. DAFB, TSS, TSS: acid ratio, specific gravity, firmness and total carotenoid content were found to be the reliable maturity indices of maturity in ber cultivars. Therefore, the present study will be useful to have multiple indices to fulfill the needs of growers, distributors, consumers and also for pharmaceutical and nutraceutical industry.
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    ThesisItemOpen Access
    Efficacy of edible coatings on postharvest quality of guava (Psidium guajava L.) cv. Pant Prabhat
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-06) Ankit Kumar; Singh, Omveer
    The present investigation “Efficacy of edible coatings on postharvest quality of guava (Psidium guajava L.) cv. Pant Prabhat” was conducted in the postharvest Laboratory of the Department of Horticulture, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar. The main aim of the study was to investigate the effects of different edible coating treatments like Aloe vera gel, calcium chloride, chitosan and sodium alginate at varying concentrations on physico-chemical characteristics and shelf life of guava fruits. The experiment was conducted in two factorial completely randomized design with 13 treatments and 3 replications. The two factors consisted of treatments and storage period. The trial was carried out at ambient temperature 27-29° C at 75% R.H in November, 2015. The changes in fruit length and breadth, fruit weight and volume, specific gravity, physiological loss in weight, decay, total soluble solids, acidity, ascorbic acid, total sugars, TSS : acid ratio, sugar : acid ratio, superoxide dismutase activity, total flavonoids content, phenolic content, antioxidants and sensory characters like fruit appearance, colour, flavour, texture, taste and overall acceptability were recorded under each treatment over a storage period of 12 days, after harvesting, starting from harvest day till 12th day during the winter season. Chitosan (1.5%) and Aloe vera 1:1 gel coating was most effective in reducing weight loss, decay and maintaining organoleptic qualities than other treatments. Higher total soluble solids, ascorbic acid, total sugars, superoxide dismutase activity, phenolic content were recorded with chitosan coating 1.5% dip treatment. Hence, it was concluded that dip treatment of 1.5% chitosan can be used for enhancing the shelf life and reducing postharvest losses in guava fruits. However, Aloe vera 1:1 gel coating due to its low price and easy availability may be considered better than chitosan.