STANDARDIZATION OF GRAFTING TIME AND PROPAGATION ENVIRONMENT IN RED PULP GUAVA (Psidium guajava L.) HYBRIDS.
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Date
2022-01
Authors
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Publisher
University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bagalkot).
Abstract
The present investigation entitled on “Standardization of grafting time and propagation
environment in red pulp guava (Psidium guajava L.) hybrids” was conducted with the
hybrids Arka Kiran, Punjab Pink and Punjab Bold during the period 2020-2021 at Fruit
nursery, MHREC, University of Horticultural Sciences, Bagalkot. The first experiment
were laid out in two factorial completely randomised design with fifteen treatments and
two replications to standardize grafting time. Nine treatments and three replications for
the second experiment to standardize the propagation environment.
Among the five different time of grafting considered viz., November, December,
January, February and March for the standardization of grafting time in different red
pulp guava hybrids, Arka Kiran grafted on February month took very less number of
days taken for first sprouting (4.24 days), maximum number of sprouts (4.37, 4.45 and
4.62), number of leaves per graft (10.25, 14.59 and 18.27 cm), sprout length (2.50, 4.60
and 7.43 cm) at 30, 60 and 90 DAG (Days after grafting) respectively. Whereas, fresh
and dry weight of shoot (24.40 and12.92 g), fresh weight of root (13.02 g), survival
percentage (99.50 %) at 90 DAG and chlorophyll content (46.25 and 63.10 SCMR) at
60 and 90 DAG respectively has been recorded.
Among the three different propagation environmental conditions considered viz.,
polyhouse, shade net and open field condition for the standardization of propagation
environment in red pulp guava hybrids, Arka Kiran placed under poly house condition
took least number of days taken for first sprouting (8.34 days), maximum number of
sprouts (4.20, 4.33 and 4.40, respectively), number of leaves per graft (10.43, 14.59 and
18.27), sprout length (2.50, 4.60 and 7.43 cm) at 30, 60 and 90 DAG respectively.
Whereas, fresh and dry weight of shoot (23.40 and 12.20 g), fresh weight of root (12.00
g), root length (28.26 cm), graft success (94.10 %), survival percentage (89.92 %) at 90
DAG. Whereas maximum chlorophyll content (45.53 and 63.00 SCMR) and the
maximum stomatal conductance (339.33 and 391.80 m mol m2
s
-2
) was observed at 60
and 90 DAG respectively when Arka Kiran grafts maintained under open condition.