Effect of time of planting and gibberellic acid (GA3) on growth and flowering of tuberose (Polianthes tuberosa L.)
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Date
2008
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Publisher
CCSHAU
Abstract
The present investigations entitled, “Effect of time of planting and
gibberellic acid (GA3) on growth and flowering of tuberose (Polianthes
tuberosa L.)” were carried out at the experimental orchard, Department
of Horticulture, Chaudhary Charan Singh Haryana Agricultural
University, Hisar during the year 2007-08. The experiment was laid out
in factorial RBD design having seven planting times (last week of
February to last week of May) and three gibberellic acid treatments (0
ppm, 50 ppm and 100 ppm) with three replications.
Days taken for initiation and complete of sprouting of bulbs were
less when bulbs were planted in month of May. The plant growth in
terms of plant height, number of leaves per plant and average length of
leaves were recorded maximum in 10th April planting which is
statistically at par with 23rd March planting, whereas, minimum in
23rd May planting. The days taken for spike initiation, opening of first
floret and 50% flowering were recorded minimum in 10th April
planting, whereas, maximum in 21st February planting. The duration
of flowering was recorded maximum in 10th April planting and
minimum in 23rd May planting. The maximum number of spikes per
plant was recorded 10th April planting which was at par with 25th
April and 23rd March plantings. The maximum length of spike, length
of rachis and number of florets per spike were observed in 10th April
planting. In case of bulb production, the number of bulbs per plant,
weight of bulbs per plant and size of bulbs (dia.) were observed
maximum in 10th April planting, whereas, minimum in 23th May
planting.
Maximum plant height, number of leaves per plant and average
length of leaves were recorded with foliar application of gibberellic acid
at 100 ppm. Minimum days taken for spike initiation, opening of first
floret, and 50% flowering were recorded with GA3 at 100 ppm. The
duration of flowering was also recorded maximum with GA3 at 100
ppm. Maximum length of spike, length of rachis and number of florets
per spike were observed with GA3 at 100 ppm. This concentration of
GA3 also resulted in production of maximum number of bulbs per
plant and size of bulbs (dia.) which was statistically at par with 50 ppm
treatment. The weight of bulbs per plant was recorded maximum with
GA3 application at 50 ppm.
Description
Keywords
Planting, Developmental stages, Tuberose, Biological development, gibberellins, acidity, productivity, yields, gladiolus, polianthes tuberosa