Study of coefficient of variation, heritability and genetic advance in hybrid rice

Thirty four genotypes were studied for their genotypic, phenotypic and environmental coefficient of variation during wet season 1999–2000. Results indicated that phenotypic coefficient of variation (PCV) was higher than the genotypic coefficient of variation (GCV) and environmental coefficient of variation (ECV) for all the traits. PCV was highest in grain yield (33.15%) followed by biological yield (26.67%), effective tillers/plant (25.87%) and spike lets/panicle. GCV was highest for grain yield/plant (26.19%) followed by effective tillers plant-1 (21.46%) and biological yield plant-1 (20.47%). GCV and PCV was lowest for panicle length followed by days to 50% flowering and plant height. High heritability coupled with high genetic advance was recorded for spikelets panicle-1. High heritability was observed 50% flowering, test weight and panicle length. Moderate heritability and low genetic advance was recorded for total number of tiller plant-1 and effective tiller plant-1. Days to 50% flowering, plant height, seed setting percentage, grain yield and harvest index showed moderate genetic advance. Genetic advance in per cent of mean ranged from 8.39 to 40.19.