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FORMULATION OF SELECTION INDICES FOR YIELD IN GROUNDNUT (Arachis hypogaea L.)

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Title FORMULATION OF SELECTION INDICES FOR YIELD IN GROUNDNUT (Arachis hypogaea L.)
 
Creator KANDATI MUNEESWARA PRASAD
 
Contributor RAJA REDDY, C
 
Subject FORMULATION , SELECTION INDICES, YIELD, GROUNDNUT
 
Description 'l'he exper.i.rrental material consisted of ten groundnut varieties
viz., 'l'MV2, JL 24, 'l'CG 1706, TCG 1704, 'l'CGS 22, 'l'CGS 25, 'l'CGS 26,
'l'CGS 37 and 'l'CGS 40, belonging to spanish bunch group. 'l'he experiment
was laid out during Kharif, 1990 in a randomised bloclt design
with three replications on wetland farm, Sri Venkateswara Agricultural
College, 'l'irupati.
The main objective of this investigation was to formulate
selection indices for yield in groundnut (Arachis hypogaea L.). By
using mean values recorded, statistical scrutiny was made to obtain
information on correlations, heritability, discriminant functions,
and relative efficiency over straight selection. There is considerable variation among genotypes for different
characters. A~ost all characters exhibited high heritability estimates,
indicating their amenability for direct selection. Most of
the characters and yield were little affected in their expression by
environment.
Natur:ecf assoc lations between yield attributes and yield
revealed that pod yield was consistently and positively correlated
with dry 'Weight per plant, number of mature pais, kernel yield per
plant . and harvest index. Interrelationships among the yield., components are qoverned by an interaction of two or more other
characters. Among yield componenta, number of mature pods and
kernel yield per plant, dry weight per plant and kernel yield
per plant, harvest index and kernel yield per plant and total
dry matter production at 90 days after sowing, shelling per cent
and mean number of nodes on primaries and main axis were significantly
correlated.
Number of mature pocs, dry weight per plant, kernel yield
per plant and harvest index showed sufficient influence on pod
yield and are important in prediction of ultimate yield.
When five yield components were considered simultaneously
for their genetic worth in the ultimate yield, pod yield per plant
exerted highest influence followed by mean number of nodes on
primaries, dry \\eight per plant, number of mature pods and oil
content. Hence due emphasis must be given on these characters
while exercising selection for yield improvement in groundnut.
A discriminant function involving five components viz.,
mean number of nodes on primaries, number of mature pods, dry
weight per plNnt, oil content and pod yield per plant rec~ded
highest per cent relative eff ieiency (548 .39), followed by a
discrimincnt function involving all 16 characters which exhibited
high second order per cent efficiency (277.22).
Discriminant function involving a 11 the 16 characters
combination recorded highest index values and showed considerable
variation among the genotypes.
 
Date 2016-08-18T10:26:29Z
2016-08-18T10:26:29Z
1991
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72872
 
Language en
 
Format application/pdf