COMPARATIVE STUDY OF HYBRID MAIZE VARIETIES IN RELATION TO YIELD BASED ON MORPHOLOGY AND GENETIC PARAMETERS
An experiment was conducted to study on morphological characters for yield and its contributing characters among 15 genotypes of hybrid maize. The study was carried out at the experimental field of the Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207 during the period of November, 2016 to May, 2017. The results indicated that the genotypes differed regarding all the characters studied. The phenotypic variance and coefficients of variation were higher than the genotypic variance and coefficients of variation in all the characters studied. Moderate to high heritability was observed for all characters except cob per plot and row per cob. High heritability coupled with high genetic advance in percent mean were observed for days to tasseling, days to pollen shedding, days to silking, plant height, ear height, cob length, cob breadth, kernel per row, thousands seed weight and seed yield. The characters days to silking, plant height, ear height, field weight, moisture percentage, kernel per row, row per kernel and thousand seed weight showed positive direct effect on yield. All the genotypes were grouped into five clusters having 5, 4, 3, 2 and 1 genotypes, respectively. Cluster V comprised the maximum number (5) of genotypes followed by cluster III (4) and II (3). The highest inter-cluster distance (33.06) was observed between the cluster IV and V and the highest distant genotypes were G6 (PAC-999 supper) and G15 (PAC-339). Among the characters studied days to tasseling, days to pollen shedding, days to silking, plant height, number of leaf, cob per plot, cob length, cob breadth, row per cob, thousands seed weight were the important component characters having higher contribution to the genetic divergence.
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