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Studies on Pre and Post Harvest Management
on Bulb and Flower Production in Tulip
(Tulipa Jasneriana L.)
Neelofar
Dr. A.Q. Jhon
PhD
2005
Flower Scape and Gibberallic Acid, Plant
Growth Regulator Sucrose
ABSTRACT
The investigations were carried out on “Pre and Post Harvest Management on Bulb and
Flower Production in Tulip (Tulipa Gesneriana L.) during 2002-2004. the study
comprised of four experiments. In the first experiment, influence of precooling (low
temperature) and PGR’s on growth, flowering, bulb production and vase life of tulip was
studied and it was found that during both the years 70 days of precooling was superior in
reducing the days to bulb sprouting (22.75 and 27.60 days, respectively), to visiblefloral
bud (80.53 and 75.37 days, respectively), flower bud blast per cent (24.94 and 38.38
respectively ), field life (98.17 and 92.47 days respectively) and in recording maximum
scape thickness (2.66 and 2.47 mm respectively) whereas significantly maximum scape
length of 18.10 and 20.57 mm respectively and flower diameter (7.75 and 8.52 cm
respectively) were recorded without precooling. Precooling did not, however, influence
bulb sprouting per cent, days to colour break and flower opening.
With PGR dips, during both the years significant maximum bulb sprouting (90%) was
obtained with GA3 50 ppm, scape length (18.32 and 18.79 cm, respectively) with GA3
100 ppm and minimum bud blast (25.0 and 26.92 respectively) and maximum scape
thickness (2.65 and 2.62 cm respectively) with control. Minimum days to visible flora
bud (106.40 and 103.16 days, respectively) were taken by Thiourea 500 ppm whereas
PGR’s did not effect days to colour break and flower opening, flower diameter and field
life.
Combined treatments of precooling and PGRdips revealed that significant minimum days
for bulb sprouting (18.66 and 19.75 days respectively) were taken by D2GR2 and
D3GR0, maximum scape length (21.30 and 26.19, cm, respectively) by D0GR1’ scape
thickness (3.33 and 3.51 cm, respectively) by D2GR0, maximum flower diameter (8.04
and 8.52 cm, respectively) by D0GR2 maximum bulb sprouting of 90% by D2GR3
during 1st year but during 2nd year bulb sprouting was recorded by maximum treatment
combinations fell in the range of 75-90% minimum days to visible flora bud (79.67 and
71.08 days, respectively) were recorded by D3GR4 and minimum flower bud blast per
cent (10.0 and 15.0%, respectively) by D3GR0).
Precooling of 70 days recorded maximum bulb weight/10bulbs (54.41 and 74.07 g,
respectively) maximum no. of bulbs > 10g /10bulbs (4.45 and 4.06 respectively) and bulb
production ratio (1.78 and 1.73 respectively) during both the years.
With PGR dips maximum bulb weight/10bulb and no. of bulbs > 10g/10bulbs was
recorded with control. However, control was closed to GA3 100 ppm recording
maximum no. of bulbs > 10g/10 bulbs. The later treatment also recorded highest bulb
production ratio (1.96 and 1.61 respectively) by D0GR1.
During both the years 70 days of precooling was superior in recording minimum days
(5.37 and 4.77, respectively) for flower opening maximum vase life (8.32 and 8.17 days
respectively) flower opening (80.59 and 82.29%, respectively) whereas, maximum flower
diameter (8.67 and 8.44 cm, respectively) was recorded without precooling of bulbs.
Precooling had a non-significant influence on all other parameters studied.
During both the years minimum days to flower opening (4.55 and 4.30 days,
respectively) were recorded by GA3 50 ppm and maximum vase life of 6.44 and 7.16
days, respectively by Thiourea 500 ppm which was close to GA3 100 ppm. The effect of
PGR dips on other parameters studied was non-significant.
In the second experiment pulsing treatment with flora preservative and sucrose had a
non-significant effect on all parameters studied. However, better results were obtained
with Su 4% + CaCl2 500 ppm for flower opening and vase life, Su 4% + Al2 (So4H 100
ppm for flower diameter, Su 4% + SA 100 ppm, Su 4% + CaCl2 1000 ppm for flower
opening during both the years. Fresh weight increased till 8th day thereafter it decreased.
In the third experiment pulsing treatment with growth regulators revealed that minimum
days to flower opening (6.66 and 6.99 days, respectively) drying both the years were
taken when perspective solution of Su 2% + 8HQ 200 ppm + CA 300 ppm (C0) was
supplemented with SA 10 mg/1 and scapes were pulsed for 4h. flower diameter was
maximum (6.90 and 6.87 cm, respectively) with SA 10g/l for 8h. during both the years.
Maximum vase life of 6.88 and 6.77 days, respectively was recorded by SA 20mg/l for
4h where flower opening was maximum (90.0%) with SA 10g/l for 48h during first year
and SA 20g/l for 4 and 8h during 2nd year. Minimum water loss (8.78g/Scape) was
recorded by GA3 100 ppm for 8h. there was, however, no effect on other parameters
studied.
In the 41 hectare experiment the results on dry and wet storage of cut tulips revealed that
minimum days to flower opening were taken by wet storage of 6 and 8 days. During both
the years largest flowers (6.90, 6.71 and 6.36, 6.13 cm respectively) were obtained with
dry and wet storage of 0 and 2 days. Vase life of flowers decreased with the increase in
storage period and zero days of wet storage recorded maximum vase life (7.55 and 7.99
days respectively) during both the years which was at par with 0 days dry storage and 4
and 6 days wet storage.
Flower opening was best with 0, 2 and 4 days of dry and wet storage whereas flowers
stored dry for 8 days did not open at all. Others parameters studied were not influenced
significantly either by dry or wet storage.
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