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Studies on genotypic performance and genotype x environment interactions in rice in different production systems

KrishiKosh

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Title Studies on genotypic performance and genotype x environment interactions in rice in different production systems
 
Creator Ghritlahre, Surendra Kumar
 
Contributor Sarial, A.K.
 
Subject Genotypes, Environment, Yields, Developmental stages, Planting, Rice, Grain, Productivity, Animal husbandry, Planting equipment
 
Description In any breeding program, it is necessary to screen and identify phenotypically stable genotypes
that could perform uniformly under different environmental conditions. Such a breeding effort requires
basic information of g x e interaction. Twenty genotypes comprising released varieties and elite lines
including hybrids and aromatic were evaluated in two production systems viz; System of rice
intensification (SRI) and normal cultivation environments during kharif 2009 at CCS HAU, rice research
station, Kaul. Eight environments E1 – E4 in SRI and E5 - E8 in normal production system were created
through different combinations of seedling age, spacing and seedling per hills. The experiment was laid
down in RBD with two replications in a plot of 1 m2 In SRI production system young seedling of 15-days
old were transplanted at one seedling per hill in wide spacing of 25 x 25 cm2 . While in normal production
system old seedlings of 25 days age were transplanted at 2 seedlings per hill in narrow spacing of 15 x 15
cm2.
Results revealed that normal production system with wide spacing and 1-2 seedlings/hill was
found to be the best followed by SRI with wide spacing and 1 seedling /hill. Normal production system
with narrow spacing and 2 seedlings /hill was the poorest. Varieties responded differentially for various
traits under SRI production systems. In general, there was reduction in days to flowering & increase in
days to maturity for all varieties, increased plant height in 10 out 20 and decrease in others, increased
panicle length and panicle weight in 8, spikelets /panicle in 9, per cent filled spikelets in 6 & test grain
weight in 8.. Irrespective of age of seedlings, all genotypes recorded almost double the number of tillers
under wide spacing than narrow. Increase in biological yield per plant, grain yield per plant and harvest
index only in 4 namely IR64, HKR 46, Pusa 112 and HKRH 1094 . These varieties also showed
increased test grain weight and tillers number. The increase in yield ranged from 11.78.to 24.31%.
Confirmatory experiments of these varieties for recommendation for SRI cultivation are required to be
conducted on larger plot size over locations and years.
Pooled analysis for g x e interaction and stability revealed that the genotypes and environments
were highly significant (p < 0.01) for all twelve characters studied. The genotype x environment
interaction was significant for days to flowering, per cent filled spikelets, grain yield per plant, days to
maturity, test grain weight and biological yield per plant but non-significant for remaining six traits.
Partitioning of variance into linear and non-linear components showed that both contributed towards g x
e interaction. All key components of SRI except tillers no. exhibited g x e interaction. Stability
parameters identified the following genotypes as stable; HKR-47 for days to flowering & days to
maturity, PR 114 for days to flowering & % filled spikelets, HKR-48 & HKR-46 for test grain weight
& days to flowering, HKR-126 for days to maturity, HKR-127, HKR-120, CSR 30, Pusa-1121& IR 64
for test grain weight. Genotypes identified suitable for favourable environments were HKR 126 for days
to flowering & test grain weight, HSD 1 for days to flowering, PAU 201 for test grain weight, Govind for
% filled spikelets & days to flowering. Genotypes identified suitable for unfavourable environment were
HSD 1 for test grain weight, HKRH 1094, HKR 48 for days to maturity, PAU 201 for days to flowering.
The varieties identified as stable and suitable for favourable environments for yield and other traits need to
be tested in macro environments over space & time. These could be utilized for direct cultivation as well
as for improvements of other cultivars.
 
Date 2016-11-11T11:18:34Z
2016-11-11T11:18:34Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/85056
 
Language en
 
Format application/pdf
 
Publisher CCSHAU