STANDARDIZATION OF GRAFTING TIME AND PROPAGATION ENVIRONMENT IN ANNONA CULTIVARS
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Date
2021-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Horticultural Sciences Bagalkot. (College of Horticulture, Bagalkot).
Abstract
An experiment was carried out to standardize the grafting time and propagation
environment in Annona cultivars viz., Arka Sahan, Island Gem and Balanagar during
2020-21 at fruit nursery, MHREC, University of Horticultural Sciences, Bagalkot. The
experiments were laid out in two factorial completely randomised design with twenty
one treatments replicated for two times to standardize the grafting time, and nine
treatments replicated for three times to standardize the propagation environment.
Among the seven different times of grafting considered viz., December 15th
,
January 1st, January 15th, February 1st, February 15th, March 1st and March 15th for the
standardization of grafting time in different Annona cultivars, Arka Sahan grafted on
15th of February took minimum days for first sprouting (9.25 days) and produced
maximum number of sprouts per graft (3.60), girth of graft union (11.75 mm), number
of leaves per graft (28.82), length of sprouted shoot (30.90 cm), girth of sprouted shoot
(4.45 mm), leaf area per graft (1157.84 cm2
), chlorophyll content (57.85 SCMR Value),
graft success (95.00 %), graft survivability (97.50 %), length of longest root (41.06 cm),
fresh weight of shoot and root (22.60 and 12.13 g, respectively) and dry weight of shoot
and root (12.11 and 6.99 g, respectively). However, the fresh shoot:root ratio (2.31) and
dry shoot:root ratio (2.21) were recorded maximum in Island Gem grafted on 15th of
March, while the maximum stomatal conductance was noticed in Arka Sahan grafted on
15th of December (367.48 mmol m-1
s
-1
).
Whereas, among the three different propagation environmental conditions
considered viz., mist house, shade house and open field condition for the standardization
of propagation environment in Annona cultivars, Arka Sahan grafts placed under mist
house condition took minimum days for first sprouting (8.53 days) and produced the
maximum number of sprouts per graft (3.83), girth of graft union (11.86 mm), length of
sprouted shoot (29.50 cm), girth of sprouted shoot (4.34 mm), internodal length in
sprouted shoot (3.13 cm) and number of leaves per graft (28.00), leaf area per graft
(1134.52 cm2
), graft success (97.77 %), graft survivability (92.55 %), length of longest
root (42.78 cm), fresh weight of shoot and root (21.66 and 11.66 g, respectively) and
dry weight of shoot and root (11.84 and 6.16 g, respectively). However, higher
chlorophyll content (61.66 SCMR Values) and stomatal conductance (350.66 mmol m2
s
-1
) was recorded in Arka Sahan grafts maintained under open condition, maximum
fresh shoot:root ratio (2.40) in Island Gem maintained under open field condition and
dry shoot:root ratio (2.35) in Balanagar maintained under open field condition.