EFFECT OF POST HARVEST DIPPING, PACKAGING AND STORAGE TEMPERATURES ON KEEPING QUALITY OF LOOSE FLOWERS OF TUBEROSE (Polianthes tuberosa Linn.).
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Date
2016-10-22
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College of Horticulture, Rajendranagar, Dr.Y.S.R. Horticultural University
Abstract
The investigation was planned and executed in the College of Horticulture,
Rajendranagar, Dr.Y.S.R. Horticultural University during the year 2013-14, to study the
influence of postharvest chemical treatments (sucrose, boric acid, aluminium sulphate and
calcium nitrate) and packaging materials (polypropylene packaging (200 gauge) without
ventilation, gunny bags and CFB boxes) on vase life of tuberose (Polyanthes tuberosa L.)
loose flower cv. Hyderabad local stored at ambient (27 oC) and cold storage conditions
(4oC). The two experiments were laid out in completely randomized design with three
replications. The tuberose loose flower was evaluated during storage every day in ambient
condition and alternate day at cold storage conditions for various parameters viz., shelf
life, fresh weight, flower length, flower diameter, number of faded or wilted flowers,
relative water content (RWC) and physiological loss in weight (PLW).
At ambient condition, the maximum shelf life of 4.56 days was recorded by dipping
of tuberose florets in 0.05% concentration of boric acid with polypropylene packaging
whereas minimum shelf life of 1.13 days only in control i.e. without any chemical dipping
and packaging. The fresh weight of flowers increased from initial weight till 3rd day of
storage in polypropylene packaging. During 5th day of storage, flower fresh weight
decreased in all treatments packed in polypropylene bags except in control i.e. flowers
packed in polypropylene bags without dipping. Maximum increase in floret length was
recorded in sucrose 2% in polypropylene bags during 1st to 5th day of storage (55.21 mm to
64.88 mm) at ambient condition. Significantly the highest flower diameter of 10.32 mm
was recorded in tuberose flowers dipped in 2% concentration of sucrose with
polypropylene packaging followed by aluminium sulphate at 0.01% with same packaging
(9.60 mm) on 2nd day of storage whereas it was lowest (6.06 mm) in control. Among the
treatments under ambient conditions, the flowers packed in gunny bags showed some
wilting on 1st day after packing while the flowers in polypropylene bags remained fresh
even on 2nd day after packing. Minimum number of flowers have wilted and were found to
be nil upto 4 days after packing in treatment with no dipping and packed in polypropylene.
The RWC of flowers increased from 1st day to 3rd day of storage in polypropylene
packaging. Significantly maximum RWC (97.95%) was recorded in flowers dipped in
boric acid 0.01% with polypropylene packaging lowest (80.50%) in control. The PLW of
flowers increased from initial day to till 4th day of storage in polypropylene packaging at
ambient condition.
At cold storage conditions, significantly maximum vase life of 10.76 days was
recorded by dipping of tuberose florets in 0.05% concentration of aluminium sulphate
with polypropylene packaging whereas minimum shelf life of 3.17 days was recorded in
control. The flowers packed in polypropylene bags or CFB boxes and in control lost the
shelf life and have wilted at 6 days of storage except T4, T5 and T6 treatments. On day 2
and 4, significantly maximum floret length was observed in treatment T16, whereas it was
minimum in T17. Significantly the highest flower diameter was recorded in flowers dipped
in T4 which was on par with T5 and the lowest in control on 2nd day of storage. The mean
comparison of diameter of flowers on 4th day showed that boric acid 0.05% in
polypropylene bags were superior (8.95 mm) which was comparable with T5 (8.91 mm)
and T7(8.34 mm) and lowest (4.98 mm) in control. Among the treatments under cold
storage (4oC) conditions, the flowers packed in CFB box showed slight wilting on 2nd day
after packing while the flowers in polypropylene bags remained fresh even on 4th day
after packing. Minimum number of flowers has wilted and it was found to be nil upto 4th
day after packing in treatments T5 and T6. During 4th day of storage, RWC of flowers
decreased in all treatments packed in polypropylene bags. On 2nd day of storage of
flowers, minimum PLW of florets (78.50%) was recorded in T10 which was comparable
with T11 (88.50%), T12 (87.00%), T14 (86.80%), T17 (86.03%) and T18 (82.50%). The
highest PLW of (100.00%) was recorded in control after 2 days of packing.
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