EVALUATION OF NINE ADVANCED LINES OF AUS RICE (Oryza sativa L.)

Abstract

A field experiment was conducted with nine aus F5 materials along with parents as checks at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka during the period from April 2015 to September 2015 to compare among the 9 F5 lines in order to select high yielding and short duration aus line(s). Fourteen characters were studied to find out the suitable traits and three replications were conducted at Randomized Complete Block Design for the improvement of rice yield. The selected genotypes were found significantly variable. Comparatively phenotypic variances were higher than the genotypic variances and PCV were higher than GCV. All characters showed high heritability. All characters except panicle length showed moderate to high genetic advance in percent mean. High heritability coupled with moderate to high genetic advance in percent mean is governed by additive gene action which is better for selection. On the other hand, the significant positive correlation with seed yield per hectare was found in days to flowering (G = 0.924, P = 0.872), days to maturity (G = 0.983, P = 0.892), plant height (G = 0.771, P= 0.657), panicle length (G = 0.503, P = 0.367), number of primary branches per panicle (G = 0.940, P = 0.669), number of secondary branches per panicle (G = 0.653, P = 0.587), total no of spikelets per panicle (G = 1.085, P = 0.535), number of filled grain (G = 1.101, P = 0.600), yield per plant (G = 0.965, P = 0.844). Path co-efficient analysis revealed that days to maturity (0.332), total number of tiller per plant (0.336), panicle length (0.973), number of primary branches per panicle (0.436), number of filled grain (1.25), number of unfilled grain (0.21) and yield per plant (1.11) had the positive direct effect on yield per hectare. Number of filled grain per panicle was important for selection. The residual effect was found 0.10737 which indicated that 89.3% of the variability was accounted for fourteen yield and yield contributing traits in the present studies. Genotype G1 and G9 took longest period for days to maturity (130.3 days) which produce higher yield G1 (5.0 t) and G9 (4.88 t) with compare to their checks. Plant height in G1 (120.3cm), total number tiller per plant in G7 (18.33), number of effective tiller in G7 (15.39), panicle length in G8 (24.67) number of primary and secondary branches per panicle in G9, number of filled grain in G9 (136.10) and yield per plant in G1 (31.0) were higher than their checks.