Effect of Temperature Regimes on Post Anthesis Period in Rabi Sorghum Genotypes
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Date
2012
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UAS, Dharwad
Abstract
A field experiment was conducted during rabi season of 2010-11 at Main Agricultural
Research Station (MARS), University of Agricultural Sciences, Dharwad to assess the effect
of temperature regimes on morpho-phenological, physiological, biochemical parameters,
yield and yield components in rabi sorghum genotypes. The experiment consisted of 16
treatment combinations laid out in split-plot design having three replications with four
temperature regimes, September II FN, October I FN, October II FN and November I FN and
four rabi sorghum genotypes (M35-1, E36-1, DSV4 and RSLG-262).
The genotypes DSV-4 and RSLG-262 took more days for 50% flowering and
maturity whereas, M-35-1 required more days for grain filling. Genotypes E-36-1 and RSLG-
262 recorded higher SPAD meter reading and chlorophyll content at all the stages. All the
growth parameters (LA, LAI, TDM and its distribution, AGR, RGR, CGR and NAR)
recorded higher values under October I FN, October II FN and November I FN temperature
regimes and thereby resulting in higher yields. Though, RSLG-262 and M-35-1 are non stay
green type but they recorded comparable yields with stay green genotypes.
The grain yield ranged from 628 to 2423 kg ha-1 was noticed in different temperature
regimes. The lowest (628 kg ha-1) grain yield was obtained under September II FN sowing,
whereas highest yield (2423 kg ha-1) was under October II FN sowing temperature regime.
These higher yields, were attributed to increased Tmax and decreased Tmin for 50% flowering
and also for maturity. The GDD values for 50% flowering and maturity increased resulting
higher yield. The regression also showed significant association for yield and GDD values for
50% flowering and maturity. Among the genotypes DSV-4 and RSLG-262 recorded
significantly higher grain yield, irrespective of temperature regimes.