COMPARATIVE TRIAL AND VARIABILITY STUDY IN TEN ADVANCED AUS RICE (Oryza sativa L.) LINES FOR SHORT DURATION AND HIGHER YIELD

Abstract

The experiment was conducted with ten genotypes and two check varieties of rice at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka during the period of April 2015 to September 2015 to estimate the comparative trial and to select high yielding and short duration genotypes of rice (Oryza sativa L.) and also to find out the genotypes which have potential traits for using in further breeding programs as parent materials. The experiment was conducted using Randomized Complete Block Design with three replications. All the genotypes compared significantly with each other and also with two check varieties for all the studying characters indicated the presence of considerably variations among the genotypes studied. Comparatively phenotypic variances were higher than the genotypic variances and also the PCV values were higher than the respective GCV values for all the characters under study. Highest phenotypic and genotypic variances were showed in plant height (127.32%), total no of spikelet per panicle (803.16%), number of filled grain per panicle (594.19%). On the other hand, the significant positive correlation with seed yield per hectare was found in days to flowering (G= 0.918, P= 0.706), days to maturity (G= 0.835, P= 0.637), plant height (G= 0.628, P= 0.550), number of primary branches per panicle (G= 0.866, P= 0.692), number of secondary branches per panicle (G= 0.834, P= 0.667), total no of spikelet per panicle (G= 0.648, P= 0.465), number of filled grain (G= 0.754, P= 0.552), yield per plant (G= 0.806, P= 0.631). Path co-efficient analysis revealed that number of effective tiller per plant (0.847), panicle length (0.080), number of secondary branches per panicle (0.430), number of filled grain (0.747) and yield per plant (0.858) had the positive direct effect on yield per hectare. The residual effect was found 0.020. This effect indicates that 98% of the variability was accounted for fourteen yield and yield contributing traits in the present studies. Comparing with the check varieties G11(4.49 t) and G12 (3.64 t), the genotype G4 showed higher seed yield per plant (31.47) and yield per hectare (5.28) but duration was long (131 days). On the other hand G3 showed higher seed yield per plant (25.07) and yield per hectare (3.773) and also the duration is short than one check variety G12.