YIELD TRIAL AMONG ADVANCED POPULATIONS OF RAPESEED (Brassica rapa L.)

Abstract

The present study was under taken using nine promising advanced populations of Brassica rapa L. at the experimental field of Sher-e-Bangla Agricultural University, Dhaka during November 2019 to March 2020. Thirteen yield contributing characters were taken for evaluating the advanced populations. To find out the variations among the yield contributing characters of the populations heritability, genetic advance, correlation, direct and indirect effect of different characters on seed yield were analysed. Analysis of variance disclosed significant variations among all populations for all the traits. Minimum difference between phenotypic and genotypic variance was observed in days to first flowering, days to 50% flowering, root length, number of primary branches per plant, number of secondary branches per plant, length of siliqua, number of seeds per siliqua, thousand seed weight and seed yield/m 2 . However, high genotypic and phenotypic coefficient of variation was observed in the number of secondary branches per plant, number of siliquae per plant, thousand seed weight and seed yield/m 2 . High heritability with low genetic advance was exhibited in days to first flowering, days to 50% flowering, days to 80% maturity, length of siliqua, number of primary branches per plant, number of secondary branches per plant, number of seeds per siliqua, thousand seed weight and seed yield/m 2 whereas high heritability with high genetic advance was observed in the number of siliquae per plant indicating high potentiality for selection of the trait. Correlation study revealed that seed yield/m had a significant positive correlation with days to maturity, number of primary branches per plant, number of secondary branches per plant, number of siliquae per plant, length of siliqua and thousand seed weight at the genotypic and phenotypic level. Direct positive effect on seed yield /m 2 was found in days to maturity, root length, the number of secondary branches per plant and thousand seed weight through path coefficient analysis. Higher seed yield/m 2 was observed in G5(244.38g), followed by G2(234.3g), G6(231.68 g). Among the populations, G5 was selected as the most promising population on the basis of days to maturity (76.33DAS), number of siliquae per plant (20.28), thousand seed weight (3.82g) and seed yield/m (244.38g).

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