RESUMEN
Field experiments were conducted using 68 hybrids, 17 parents and four checks across two different agroclimatic zones of Andhra Pradesh, South India during Kharif, 2008 and rabi-2008-09 to estimate the genetic variability parameters for yield and yield contributing characters. Pooled analysis over the environments, genotype and environment interactions were significant for traits like panicle weight, flag leaf length, flag leaf width, productive tillers per plant, filled grains per panicle, 1000 grain weight and grain yield per plant, implies differential behavior of genotypes under the four environments for these characters. The estimates of phenotypic coefficient of variation (PCV) were slightly higher than those of genotypic coefficient of variation (GCV) for all the traits studied across the seasons. Slight differences were observed for all the characters with regard to variability coefficients, heritability and genetic advance % of mean in different environments. Panicle weight, flag leaf length, flag leaf width, grains per panicle, yield per plant, 1000 grain weight and productivity per day were recorded moderate to high GCV, PCV, heritability, genetic advance % of mean, characters could be transmitted to the progeny and phenotypic based selection would be effective.