Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
Methodology
A field experiment was conducted to study growth and yield of groundnut as influenced by
moisture stress imposed at different growth stages of groundnut using rainout shelters under
rainfed conditions during Kharif, 2015-16 at Agricultural Research Station, Ananthapuram of
Andhra Pradesh. This experiment was non replicated laid out in split plot design. The main
plots consisted of four treatments viz., M1: Imposing moisture stress during 30-50 DAS
(flowering to pegging), M 2: Imposing moisture stress during 50-70 DAS (pegging to pod
formation), M 3: Imposing moisture stress during 70-90 DAS (pod filling to maturation) and
M4: Moisture stress free condition and sub plots comprised of 5 varieties viz., K-6, K-9,
Anantha, Dharani and Harithandhra. Sowing of different varieties was taken up as per the
treatments M1, M2 and M3 treatments were imposed by withholding rainfall using rainout
shelters during 30-50 (flowering to pegging), 50-70 (pegging to pod formation), and 70-90
DAS (pod filling to maturation) respectively followed by regular irrigation. In M 4 treatment
moisture stress free condition was maintained by providing irrigation for entire crop growth
period through sprinkler irrigation system. Leaf, stem, root dry weight per plant at 40 and 80
DAS, and pod yield was measured. A two-way ANOVA is used by considering periods
(days) as a related factor, moisture stress levels and varieties as independent factors followed
by DMRT to identify homogeneous subsets among moisture stress levels and varieties with
respect to pod yield.
Results
The results indicated that dry matter partitioning is changing significantly at different stages
of crop growth as presented in the table below. Further, an interaction effect of different
stages (DAS) and moisture stress levels is also influencing the dry matter partitioning in
stem which significantly varied with four moisture stress levels. Similarly, dry matter
partitioning is significantly different among five varieties at 40 and 80 DAS which supports
an interaction effect of moisture stress and at different stages. Further it is also noticed that
dry matter partitioning in stem is significantly different among four moisture stress levels at
5% level in which ‘moisture stress free’ is deviating significantly from other three levels
with the highest partitioning value i.e 2.438 irrespective of DAS and varieties (DMRT).
Whereas treatments influence the dry matter partitioning in stem significantly in which
Dharani and K9 varieties are showing high value of partitioning than that of other three
varieties (DMRT).
Moisture stress during 70-90DAS (pod filling to maturity) recorded highest pod yield
reduction followed by Moisture stress during 50-70DAS (pegging to pod formation) and 30-
50DAS (flowering to pegging) compared to stress free condition. It indicates that pod filling
to maturity stage is most critical stage in groundnut. Among varieties K6, Harithandra and
Ananta recorded pod yield reduction of 54%, 53.7% and 49.3% respectively. K9 and
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