PHYSIOLOGICAL BASIS OF YIELD VARIATION AMONG DIFFERENT PLANT TYPES IN COTTON
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Date
2001-08-08
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A field experiment was conducted during 1999-2000 under rainfed
conditions at the Agricultural Research Station, Dharwad to study the
productivity potential, physiological and biophysical basis of yield
variation of different plant types in cotton genotypes. The experiment
consisted twenty genotypes laidout in a randomised block design with
three replications on medium black soil. Hybrids, robust and compact
genotypes were selected based on growth and morphological characters
like, plant height, number of leaves, number of nodes, sympodia and
monopodia.
Hybrids produced higher seed cotton yield as compared to robust
and compact genotypes. Among the genotypes, DHH-542 produced
significantly higher seed cotton yield (2112.4 kg ha-i), which was mainly
attributed to its close association with yield components and other
characters such as boll number (r=0.793), harvest index (r=0.538) and
photosynthetic rate (r=0.461).
Genotypes showed significant differences in their growth pattern,
phenological characters and physiological parameters. Hybrids possessed
higher dry matter at all the stages mainly because of higher AGR, NAR
and number of leaves per plant as compared to robust and compact
genotypes. Correlation studies indicated highly significantly positive
association of yield with TDM (r=0.613), AGR (r=0.793) and NAR •
(r=0.864). With regard to biophysical characters, hybrids possessed
higher photosynthetic rate and moderate respiration rate as compared to
robust and compact genotypes.
It is inferred that hybrids were morpho-physiologically efficient
interms of growth and yield components and biophysical characters due
to which they were able to tolerate drought and produced higher seed
cotton yield.
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