Browsing by Author "Tripathi, Shailesh"
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ThesisItem Open Access Agrobacterium mediated transfer of cryl (C) gene in chickpea (Cicer arietinum L.)(Govind Ballabh Pant University of Agriculture and Technology, Pantnagar (Uttarakhand), 2004) Tripathi, Shailesh; Chawla, H.S.ThesisItem Open Access Assessment of pre-harvest fruit bagging on quality of litchi fruits cv. Rose Scented(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-08) Kamboj, Vikrant; Tripathi, ShaileshThe present investigation was undertaken at Horticulture Research Centre, Patharchatta of G. B. Pant University of Agriculture & Technology, Pantnagar, Udham Singh Nagar, Uttarakhand during the year 2019. The main aim of study was to see the effect of different bagging materials (pink polypropylene bags, white polypropylene bags, red polypropylene bags, blue polypropylene bags) and different bagging dates (55 days before harvest, 45 days before harvest, 35 days before harvest and 30 days before harvest) on the quality of litchi fruits. Findings revealed that white polypropylene bag had most effectively improved the physical as well as the chemical attributes of litchi viz. fruit retention, fruit cracking, peel colour, fruit weight, fruit volume, pulp weight, pulp to seed ratio, TSS, total sugars, reducing sugars, non-reducing sugars, ascorbic acid and fruit peel anthocyanin content compare to different bagging materials used. Higher fruit weight, diameter, TSS with lower sun burn and minimum cracking were found in fruits bagged with white polypropylene bags. However, fruits bagged 30 days prior to harvest gave significant results for all the parameters. The benefit: cost ratio calculated for all the treatments showed that bagging of fruits 30 days before harvest with white polypropylene bags showed feasibility in litchi cultivation as the net return per rupee was 2.35. From the above findings, it is concluded that bagging of litchi fruits 30 days before the normal harvest with white polypropylene bags may be recommended to enhance the physico-chemical parameters. So, use of pre-harvest fruit bagging to get quality production of litchi fruits is recommended to farmers for better returns.ThesisItem Open Access Effect of pre-harvest fruit bagging on maturity and physico-chemical properties of guava fruits cv. VNR Bihi(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-06) Jat, Mohan Lal; Tripathi, ShaileshThe present experiment was conducted at Horticulture Research Centre, Pattarchatta and Department of Horticulture, G. B. Pant University of Agriculture & Technology, Pantnagar, Udam Singh Nagar, Uttarakhand, during the year 2018-2019. To evaluate the effect of different pre-harvest bagging materials (Biodegradable bags; purple, yellow, pink, green and red; Polypropylene bags; blue, light green, white, green and red; Polyethylene bags; yellow, white, blue, green, orange and pink) on maturity and physico-chemical properties of guava cv. VNR Bihi. Altogether, there were seventeen treatments replicated five times. The bagging was done 6 weeks before harvest. Among the various bagging materials used; blue polyethylene bag was found superior for the physical characteristics of guava fruits viz., fruit length, fruit diameter, fruit weight, fruit volume, specific gravity, fruit firmness and flesh thickness while, pink biodegradable bag was found to improve chemical characteristics viz., total soluble solids, titratable acidity, TSS:acid ratio, ascorbic acid, total sugars, reducing sugars, non-reducing sugars content significantly with 10 days earlier fruit maturity compared to unbagged fruits. Based on the overall findings, it could be concluded that fruit bagging is highly beneficial for the quality improvement of guava fruits cv. VNR Bihi. As per the results, pre-harvest fruit bagging with blue polyethylene or pink biodegradable bags were found the best for the improvement of physical and chemical quality parameters of the fruits. So, it can be conferred that farmers should use pre-harvest fruit bagging so that quality fruit production of guava can be achieved for better economic returns.ThesisItem Open Access Evaluation of mango germplasm under tarai condition of Pantnagar(G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand), 2001) Tripathi, Shailesh; Tiwari, J.P.ThesisItem Open Access Response of rainy season guava cv. Sardar to foliar application of calcium, magnesium and iron under Tarai region of Uttarakhand(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-06) Jitendra Kumar; Tripathi, ShaileshThe present study was conducted at Horticultural Research Centre, Patharchatta, GB Pant University of Agriculture & Technology, Pantnagar during the year 2016-17 and 2017-18. In this study 63 guava cv. Sardar trees planted at a spacing of 8×4 m were subjected to foliar sprays of calcium, magnesium and iron at the time of fruit set and again after one month to evaluate the effect of foliar sprays of calcium, magnesium and iron on yield and quality of guava. The experiment was carried out in Randomized Block Design with 21 treatments and 3 replications. The foliar sprays of calcium, magnesium and iron significantly influenced vegetative and physico-chemical characters of fruits. Treatments also affected the leaf nutrient status and leaf chlorophyll content significantly. Most of the parameter were found to be maximum under the treatment T21 [FeSO4 (0.6%) + CaCl2 (0.6%) + MgSO4 (0.6%)]. However, titratable acidity was significantly lowest under the treatment T21. Some of the treatments viz., stem girth, fruit length, fruit diameter, fruit length : diameter ratio, fruit specific gravity and seed related characters were non-significantly influenced by the nutrient sprays. From the present study, it can be concluded that foliar sprays of calcium, magnesium and iron are beneficial for improving yield and quality of guava cv. Sardar and overall plant growth. Further, 0.6 per cent each of FeSO4, CaCl2 and MgSO4 foliar sprays two times at one month’s interval can obtain the best results in terms of better plant growth, yield and quality of fruits.ThesisItem Open Access Studies on efficacy of composite edible coatings on postharvest quality and shelf life of guava (Psidium guajava L.)(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Kohli, Karishma; Tripathi, ShaileshThe present investigation entitled “Studies on efficacy of composite edible coatings on postharvest quality and shelf life of guava (Psidium guajava L.)” was conducted in the Postharvest Laboratory, 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 composite edible coating treatments like olive oil, Aloe vera gel, xanthan gum, sodium alginate and carboxymethyl cellulose as a base coatings with calcium gluconate as a texture enhancer and ascorbic acid as an antioxidant at varying concentrations on physicochemical characteristics and shelf life of guava cvs. Sardar and Lalit. The experiment was conducted in two factorial completely randomized design with 11 treatments and 3 replications. The trial was carried out at ambient temperature 27-29°C at 91% R.H in winter seasons of 2017 and 2018. The changes in physiological loss in weight, decay, total soluble solids, titratable acidity, ascorbic acid, total sugars, TSS: acid ratio, sugar: acid ratio, pH, total chlorophyll content, superoxide dismutase activity, total flavonoids content, phenolic content, antioxidants, polyphenoloxidase activity and sensory characters like fruit appearance, colour, flavour, texture, taste and overall acceptability were recorded for each treatment over a storage period of 15 days after harvesting, starting from harvest day up to 15th day of storage during the both winter seasons. Olive oil composite edible coatings were most effective in reducing weight loss, fruit decay and maintaining organoleptic qualities than other treatments. Higher total soluble solids, ascorbic acid, total sugars, superoxide dismutase activity, phenolic content and antioxidant activity were recorded in fruits coated with olive oil 100% + texture enhancer 0.5% and olive oil 100% + texture enhancer 0.5% + antioxidant 0.1% treatments in cv. Sardar as compared to cv. Lalit. Hence, it can be concluded that olive oil composite edible coatings coated fruits in cv. Sardar fruits retained more desirable texture and other postharvest quality attributes as compared to cv. Lalit under ambient storage conditions at different storage intervals.ThesisItem Open Access Studies on response of growing environment and propagation methods on graft success in different cultivars of Aonla(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2017-06) Jalal, Asmita; Tripathi, Shailesh