EVALUATION OF GRAPE JUICE VARIETIES UNDER NORTHERN DRY ZONE OF KARNATAKA
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Date
2022-01
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University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bagalkot).
Abstract
The experiment entitled “Evaluation of Grape juice varieties under northern dry
zone of Karnataka” was conducted at Horticulture Research and Extension Centre,
Vijayapur (Tidagundi) during October 2020 to February 2021. The experiment was laid
out in a randomized block design with six treatments and four replications.
Observations on growth, yield and quality parameters of the grape juice varieties were
evaluated.
Among the different accessions evaluated, the minimum number of days taken
to bud burst (6.25 days), highest number of matured canes per vine (46.02) and fruitful
canes per vine (42.59) was recorded in ARI - 516. The maximum shoot length (64.13
cm) and shoot girth (0.81 cm) was registered in Manjari Medika at 60 days after fore
pruning. While, the variety Manjari Medika also recorded the highest pruned biomass
(1.20 kg/vine), leaf area (132.47 cm2
) and chlorophyll content (41.40 SPAD value). The
variety Bangalore Blue took less number of days for panicle appearance (10.75 days).
Whereas, the minimum number of days for harvesting (118.25 days) and highest
number of bunches per vine (78.00) was noticed in ARI - 516. While, the maximum
weight of 100 berries (262.30 g), berry length (17.65 mm) and berry diameter (16.53
mm) was registered in variety Gulabi × Bangalore Purple. The performance with respect
to yield pointed out that the variety Manjari Medika recorded the maximum number of
berries per bunch (139.56), bunch weight (311.22 g), bunch length (21.03 cm), bunch
width (9.42 cm) and yield (14.82 kg/ vine and 33.28 t/ ha) which was followed by
ARI - 516.
With respect to quality parameters, the highest juice recovery percentage
(70.96 %) was recorded in Manjari Medika. The highest TSS (21.25º B), reducing sugar
(15.38 %), total sugar (17.02 %) and the minimum titratable acidity content (0.46 %)
was recorded in ARI - 516. The organoleptic scores on overall acceptability (8.68) was
highest for the juice of ARI - 516. Considering overall parameters, Manjari Medika was
found better followed by ARI - 516 based on yield parameters and juice recovery under
northern dry zone of Karnataka.