EVALUATION OF ONION (Allium cepa L.) GENOTYPES BASED ON MORPHO-PHYSIOGENIC TRAITS

Abstract

Twelve genotypes of Onion (Allium cepa L.) were evaluated to study the evaluation of genotypes based on morpho-physiogenic traits at Sher-e-Bangla Agricultural University, Dhaka during December 2016 to April 2017. In this experiment twelve onion genotypes were used as experimental materials. The experiment was laid out in Randomized Complete Block Design (RBCD) with three replications. Mean performance, variability, genotypic and phenotypic correlation coefficient and path analysis on different yield contributing characters and yield of onion genotypes were estimated. The highest bulb yield/plant (48.93) was recorded in the genotype of Laltir King, whereas the lowest bulb yield/plant (8.6) from the genotype of BARI Piaj 3. Phenotypic coefficient of variation was higher than the genotypic coefficient of variation for all the yield contributing traits. In correlation study, yield per bulb positively and significantly correlated with plant height (0.703 and 0.648), root length (0.370 and 0.344), no. of leaves (0.906 and 0.823), leaf length (0.674 and 0.618), leaf breadth (0.738 and 0.519), bulb length (0.869 and 0.728), bulb diameter (0.931 and 0.807) and dry weight per bulb (0.929 and 0.897) at both genotypic and phenotypic levels respectively. Path coefficient analysis revealed to that plant height had direct positive effect (5.058), root length had direct positive effect (0.263), no. of leaves had direct positive effect (1.129) and dry weight per bulb had direct positive effect (0.44) on yield per bulb, indicating these are the main contributors to yield per bulb.