COMPARATIVE TRIAL AMONG TEN ADVANCED LINES OF BORO RICE

Abstract

The investigation was carried out under the field condition to characterize and study variability among the ten advanced boro rice lines (F9 genotypes) during the period of boro season (2017-2018) at the experimental field of Sher-eBangla

Agricultural University, Dhaka. Variability study are carried out on twelve parameters to select the best lines for further trial. Among all the quantitative character number of effective tillers per plant, time of maturity, thousand grain weight and yield showed difference in all the lines which showed better agronomic performance. The highest days to maturity was observed in L8 (141 days) and the minimum days to maturity was observed in L5 (134 days). Phenotypic variance for number of total tillers per plant showed (3.26) was higher than genotypic variance (0.68) indicating moderate environmental influence on these characters and high difference between the phenotypic coefficient of variation (12.94%) and the genotypic coefficient of variation (6.71%) value indicating that this trait was highly influenced by the environment. L5 showed the maximum (9.21 t/ha) yield per hectare and the minimum by in L10 (7.07 t/ha). Days to maturity showed high heritability (72.25%) coupled with low genetic advance (3.26) and moderate genetic advance in percentage of mean (2.38%). Yield per hectare exhibited high heritability (55.05%) conjunction with very low genetic advance (0.86) and genetic advance in percentage of mean (10.94%). Days to maturity showed significant and positive correlation with plant height (G=0.375*) at genotypic level suggested that if days to maturity increased the plant height also increased. It also exhibited significant and positive contribution with plant height (G=0.375, P=0.327) at both genotypic and phenotypic level and with number of effective tiller (P=0.034), total number of filled grain per panicle (P=0.001) at phenotypic level. Days to maturity showed significant negative association with thousand seed weight (G=-0.062, P=-0.141) at both genotypic and phenotypic level. Path coefficient analysis revealed that days to maturity was negatively correlated (-0.548**) and had negative direct effect (-0.422) on yield per hectare. Thus, the lines L5, L8 and L9 would be suitable for release as high yielding boro rice variety for their short duration and high yielding characters.