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EVALUATION OF CHITOSAN FOR IMPROVING PRODUCTION AND QUALITY OF ORCHID (Dendrobium Cv. „SONIA‟)

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Title EVALUATION OF CHITOSAN FOR IMPROVING PRODUCTION AND QUALITY OF ORCHID (Dendrobium Cv. „SONIA‟)
 
Creator Kumari, Sunila
 
Contributor Singh, Dr. Jitendra
 
Subject polysaccharides, developmental stages, planting, concentrates, budding, productivity, orchids, harvesting, organic acid salts, wells
 
Description The present investigation entitled “Evaluation of Chitosan for improving
production and quality of orchid (Dendrobium cv. „Sonia‟)” was conducted
under protected conditions during the year 2010-11 and 2011-12 at the State Govt.
Horticulture Nursery, situated at Chokra Nala, Labhandi, Raipur, being maintained
by Department of Horticulture, College of Agriculture, IGKV, Raipur.
The investigation was conducted in two set of experiments on Dedrobium
cv. Sonia. In first experiment chitosan was applied as foliar spray on plants and it
constituted of total thirty two treatment combinations and an additional untreated
control. In second experiment, chitosan was applied directly to the young
inflorescence (5 cm long), and it constituted of total twenty four treatments
combinations and an additional untreated control. Both the experiments were
conducted under factorial completely randomized block design (Factorial CRD)
with three factors (product formulation, concentration and number of applications)
replicated thrice. Chitosan was sprayed four times at monthly intervals in first
experiment and thrice at weekly intervals in second experiment, until runoff using
a manual sprayer.
Data showed that chitosan significantly affected all the vegetative, floral,
yield and quality parameters under study and improvement was recorded with all
the treatments as compared to control. Also significant variation was observed
among chitosan formulation, their concentrations and application frequencies.
From the first experiment it was found that, P2 (chitosan chlorohydrate)
was superior in terms of height and number of pseudobulbs, and superior in
improving flower quality while, chitosan acetate (P1) recorded better vegetative
growth, higher yield and significantly longer vase life of spike.
Different concentrations also had significant effect on various vegetative,
floral, yield and quality parameters. Among all the chitosan concentrations applied,
7.5 ppm (C3) was found to be beneficial for most characters. A further increase in
concentration was found to be detrimental in most of the case.
Number of applications of chitosan also significantly affected various
vegetative, floral, yield and quality parameters in Dendrobium cv. Sonia. Three
applications were found beneficial in most of the cases, and more applications
resulted in detrimental effects except in case of longevity of spike on plant, number
of days taken from opening to harvest, number of leaves per plant. However, it was
non-significant in case of number of florets per spike.
From the second experiment, it was found that chitosan application as spray
on young inflorescence, significantly improved various floral and quality
parameters. The responses were positively related to the applied concentration with
the highest peak recorded with 7.5 ppm then it started declining although, they
were significantly higher than control. Application frequency also had significant
effect on various floral and qualitative characters. Three applications were found to
be superior for most of characters. Product and concentration (P X C) interaction
was found to be significant for most of characters. Overall, treatment combination
P2C2A3 (7.5 ppm chitosan chlorohydrate applied thrice) was found to be superior.
The economics calculated based on first experiment showed highest
benefit cost ratio (B:C) in treatment combinations P1C3A4 (7.5 ppm chitosan
acetate applied four times) and P1C3A3 (7.5 ppm chitosan acetate applied thrice)
(3.22 and 3.16, respectively). Apart from all these effects of chitosan, the chitosan
treated plants showed lesser disease and pest infestation, especially lesser leaf
spots and mites infestation and also resulted in better overall appearance of spikes.
 
Date 2016-02-09T13:54:44Z
2016-02-09T13:54:44Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64248
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur