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Researcher Mandal, Bipul Kumar
Advisor Ray, R. N.
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Doctor of Philosophy (Ph.D.)
Publisher Birsa Agricultural University
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Light & infrared & ultraviolet phenomena
Subject Keyword Impact of Foliar Spray of Urea ♦ Thio-urea and Growth Regulator On Bearing and Physico-chemical Properties of Mango Cv. Amrapali ♦ Horticulture
Abstract Mango (Mangifera indica. L) is one of the most important and oldest cultivated perennial fruit crops of tropical and sub-tropical world. It is greatly relished for its succulence, exotic flavour and delicious taste. The mango apart from being one of the major source of vitamins and minerals to the local people, has also a high export potential. India is endowed with vast germplasm of mango and no other country in the world matches the genetic diversity as is available in India in terms of mango varieties and the richness of its strains. Among important one, Amrapali, a cross between Neelum and Dashehari has assumed significance in diversified fruit culture in north India. However, despite many strong points in the favour of Amrapali, it has also very low orchard efficiency like other varieties due to erractic flowering, low fruit set and excessive fruit drop. Hence, with a view, an attempt was made at Horticulture garden of department of Horticulture Birsa Agricultural University, Ranchi (Jharkhand) on 10 years old plant of Amrapali mango in two fruiting seasons from 2008 to 2010 to investigate and assess the comparative performance of urea, thio-urea and PGRs (GA3, NAA, Ethephon, Salicylic acid and Triadimefon) and their suitable combination and concentration on bearing and physio-chemical properties as well as shelf-life through foliar feeding. The experimental findings makes it evident that all the treatments had favourable effect in causing earliness in emergence of panicle, days to first flowering and extending the duration of panicle emergence over control. Among different treatments application of ethephon 200ppm caused earlier panicle emergence by 16 days as well as days to first flowering by 12.33 days compared to control. Moreover, it also extended the duration of panicle emergence by 13 days after spray. This was followed by triadimefon (2000ppm). Applying triadimefon (2000ppm) combined with urea (2%) prouduced highest percentage (88.50%) of flowering shoot which was found equally effective with triadimefon 2000ppm mixed with urea (2%) and SA 100ppm in combination with urea. Another great concern is fruiting after flowering. Remarkable effect on both the number of fruit set (48.06) and fruit retention (5.41) per panicle were observed under combined spray of SA 100ppm and urea 2% which was closely followed by triadimefon (200ppm). It was further inferred that GA3 100ppm followed by T12 (urea 2%+ ethephon 200ppm) and T10 (urea 2% + GA3 100ppm) has performed significantly better in terms of size and weight of fruits. Applying SA in combination with urea (2%) produced the highest number of fruits (194.45) as well as yield (16.21 kg) per plant compared with the lowest number of fruits (40.20) and yield (6.60 kg) per plant in control (water spray). Increased number of fruit set and fruit retention was bound to enhance fruit yield/plant. Different treatments resulted in significant change in the physico-chemical composition of mango (Amrapali) fruit. The maximum pulp percentage (71.46%) and minimum stone percentage (11.19%) were estimated with combined spray of urea (2%) and SA (200ppm) whereas incase of TSS and reducing sugar, it was found to be maximum with GA3 (100ppm) comparable with T16 (Triadimefon 2000ppm + Urea 2%). Similarly maximum total sugar (11.97%) and phenol content (2.84 mg/100 gm) were calculated under Triadimefon (2000ppm) application. Furthermore, both the concentration of SA application either alone or in combination with urea markedly increased acidity percentage. Moreover, spray of triadimefon (2000ppm) in combination with urea (2%) were most responsible in enhancing the ascorbic acid and β-carotene content. The treatment combination both SA (100ppm) and triadimefon (1000ppm) combined with urea effectively minimized the PLW (%) and spoilage of Amrapali mango during storage at room temperature. From the point of economics, use of SA spray could be recommended for increasing net return.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Publisher Place Jharkhand ♦ Ranchi
Size (in Bytes) 7.07 MB
Page Count 109