INFLUENCE OF GROWTH PROMOTING AND RETARDING COMPOUNDS ON GROWTH, DRY MATTER PRODUCTION AND YIELD IN GREENGRAM DURING RABI
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Date
2010
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
An experiment was carried out to study “Influence of growth promoting
and retarding compounds on growth, dry matter production and yield in
greengram during rabi” at Student’s Farm, College of Agriculture,
Rajendranagar, Hyderabad, on sandy loam soil during Rabi 2009-10. A field
experiment was conducted in randomized block design with 9 treatments
replicated thrice. The basic material for the present investigation consists of
Greengram cv WGG-37 and two growth promoting (NAA and
Brassinosteroid) and growth retarding substances (chlormequat chloride and
mepiquat chloride). These growth regulators were sprayed at flower initiation
stage.
The morphological and physiological traits viz., number of branches
per plant, number of trifoliates per plant and number of root nodules per plant
were significantly increased by NAA @ 20 ppm, whereas plant height was
significantly increased by chlormequat chloride 50% SL (187.5 a.i/ha) over
control. The dry matter accumulation in leaf, stem and reproductive parts
increased significantly due to the application of growth regulators. NAA (20
ppm) and brassinosteroid (20ppm) recorded significantly higher values for
total dry matter production (TDM) over growth regulator treatments at all
stages.
The growth parameters viz., LAI, RGR, CGR, NAR, SLW and LAR
increased significantly with the application of growth regulators.
The biochemical parameters viz., photosynthetic rate, chlorophyll
content, protein content and nitrogen harvest index were higher with
chlormequat chloride.
The seed yield increased significantly with NAA (20 ppm) followed by
mepiquat chloride 5% AS, brassinosteroid (20 ppm), chlormequat chloride
(137.5.5 a.i/ha). The results on yield and yield attributes indicated that, all the
yield contributing characters viz. number of seeds per plant, number of seeds
per pod, number of pod per plant, and harvest index increased due to growth
regulator treatments.
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Keywords
INFLUENCE, GROWTH, PROMOTING, RETARDING, COMPOUNDS, GROWTH, DRY, MATTER, PRODUCTION, YIELD, GREENGRAM, DURING, RABI