Effect of chlormequat chloride on growth, yield and fruit quality of grapes under protected conditions
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The investigation entitled “Effect of chlormequat chloride (CCC) on growth, yield
and fruit quality of grapes under protected conditions” was carried out at Fruit Research
Farm, Department of Fruit Science, Punjab Agricultural University, Ludhiana. The
experiment was conducted on grape cvs. Flame Seedless, Perlette and Punjab Purple grown in
protected structure and open field conditions. Application of chlormequat chloride (250, 500,
750 and 1000 ppm) was done when the vines reached 5-leaf stage after sprouting. Results
revealed that application of chlormequat chloride reduced the vegetative growth in terms of
cane length and internodal length with maximum reduction recorded in the vines sprayed with
highest dose of chlormequat chloride. Under the protected field conditions the increase in
cane length at various intervals was more as compared to open field. At the end of
observation period (69 days), the lowest cane length (110.0cm) in Flame Seedless was
recorded with chlormequat chloride@ 1000 ppm while it was 204.4 cm in case of control.
Similarly, the foliar application of CCC @ 1000ppm followed by CCC @ 750 ppm was found
to be the most effective in reducing leaf size and trunk girth. Also, chlormequat chloride
decreased the content of IAA and GA3 on each date of sampling relative to untreated buds.
Application of CCC @ 1000ppm and 750 ppm was adjudged as the best treatment for
improving the bunch quality in terms of TSS, total sugars and anthocyanin content in the
berries. In Punjab Purple under protected field conditions, the maximum TSS content was
found in 750 ppm chlormequat chloride (20.34%) which was at par with 1000 ppm
chlormequat chloride (19.85%). Among the various treatments, foliar application of CCC @
1000 ppm significantly improved the average yield and quality of grape clusters viz. bunch
weight, size, berry weight and size and TSS: acid ratio. Under protected conditions, yield of
Flame Seedless (9.48 kg/vine) and Perlette (7.42 kg/vine) was highest in CCC @ 1000 ppm
as compared to control (7.56 and 5.22 kg/ vine respectively).
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Citation
Jashanpreet Kaur (2021). Effect of chlormequat chloride on growth, yield and fruit quality of grapes under protected conditions bengalensis (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.