G × E interaction studies under different production systems in maize (Zea mays L.)
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Date
2022-12-26
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CSK HPKV, Palampur
Abstract
The present investigation was carried out for G × E interaction analysis of
twelve maize genotypes for fourteen traits at six environments during kharif, 2021
and 2022 under two different production systems (Subhash Palekar Natural Farming
and inorganic production system) using randomized block design with three
replications. The pooled analysis of variance across environments exhibited
significant mean squares due to environments and genotypes, whereas for G × E
interaction all the traits except kernel rows per cob and ear circumference were found
significant. G × E interaction and stability analysis following AMMI model also
exhibited significant variation due to genotypes and environments for all the traits
indicating presence of sufficient variability among the genotypes and environments,
whereas G × E interaction was significant for all the traits except for number of
kernel rows per cob and ear circumference (cm). The contribution of environment
was greater than 50% for all the traits except number of kernel rows per cob, ear
circumference (cm), 100-grain weight (g), harvest index (%) and protein (%). The
mean squares for the IPCA 1, IPCA 2 and IPCA 3 cumulatively contributed more
than 80% of the total G × E interaction for all the traits. AMMI stability index (ASI)
and AMMI stability value (ASV) revealed that Girija was stable for maximum
number of traits viz., days to 50% tasseling, days to 75% maturity, plant height (cm),
cob height (cm), grain yield per plant (g) and 100-grain weight (g) across all six
environments followed by L-315 which was stable for days to 50% silking, grain
yield per plant (g), number of kernels per row, ear length (cm) and protein (%) and
L-316 was stable for days to 50% tasseling, days to 75% maturity and harvest index
(%) and also had highest mean grain yield per plant across all environments. AMMI
biplots revealed that the environment Palampur under the inorganic production
system was most favourable for number of kernels per row, ear length (cm), grain
yield per plant (g) and 100-grain weight (g). Girija was most stable for grain yield
per plant followed by L-315, L-316 and L-318 under inorganic production system.
Bajaura Makka followed by L-315 and L-316 were stable genotypes under Subhash
Palekar Natural Farming production system with high grain yield per plant. L-315
and L-316 were found suitable for cultivation under both production systems.