Variability And Association Studies in Soybean Glycine Max .L. (Merril)
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Date
1999
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Birsa Agricultural University, Ranchi
Abstract
Fortyfive soybean genotypes were grown in a randomized completed block design with three replications during Kharif season of 1995 .The data recorded on eleven quantitative character viz days to first flowering days to 50 % flowering, plant height, number of primary branches per plant , days to maturity, number of pods per plant pod length number seed per pod number of seed per plant, 100
Seeds weight and seeds per pod, number of seeds per plant 100 seed weight and seed yield per plant were analyzed to find put the estimate of variability heritability genetic advance correlation coefficients and path coefficients.
The analysis of variance revealed highly significant differences among the genotypes for all eleven characters. The characters days to first flowering days to 50 % flowering plant height , number of pod per plant, number of seed per plant, seed yield per plant and 100 seed weight showed a wede range in their gross variability.
The characters number of pods per plant, number of seed per plant and seed yield per plant recorded high phenotypic coefficient as well as genotypic coefficient of variation. Number of primary branch es per plant and plant height showed moderately high coefficient of variation.
Heritability for all the characters under study except number of seeds per pod was high. ?Number of pods per plant and number of seeds per plant showed high genetic advance as per cent of mean. Seed yield per plant and number of primary branches per plant also showed high genetic advance as cent of mean.
Seed yield per plant was strongly correlated with number of pods per plant and number of seeds per plant. Correlation between seed yield per plant and days to 50 per cent flowering and also between seed yield per plant and number of primary branches was highly significant.
Path coefficeient analysis revealed that the character number of seeds per plant had the maximum direct effect on seed yield per plant .100 seed weight also showed high direct effect on seed yield per plant. High correlation between seed yield paer plant and number of pods per plant was also through number of seeds per plant.
It appears that phenotypic selection for number of pods per plant number of seeds per plant and number of primary branched per plant would be useful for all practical purpose in soybean