HAIDER, Z.A.MAHTO, JAY LAL2023-04-012023-04-011988https://krishikosh.egranth.ac.in/handle/1/5810195999VARIABILITY STUDIES OF SOME PROMISING LINES OF SOYBEANForty soybean genotypes collected from different eco logical regions of the country were taken for the present investigation. Thirteen yield attributing parameters were considered for variability studies, correlation and path co-efficient analysis. Study on analysis of variance revealed significant differences for all the characters, except the leaf area. Plant height, leaf area, member of leaflets per plant, days to maturity, seed yield, number of pods per plant, number of seeds per plant and number of clusters per plant showed wide range of phenotypic variability. Leaf area, member of seeds per plant and number of pods per plant exhibited high genotypic and phenotypic co-efficient of variation. Though heritability in broad sense was high for all the parameters except the leaf area, the genetic advance in per cent of mean was high for member of pods per plant, plant height, and number of leaflets per plant, number of seeds per plant, number of clusters per plant, seed yield and primary branches. Correlation studies revealed that seed yield had strong positive association with member of seeds per plant, miner of clusters per plant, plant height, days to 50 per cent flowering and days to maturity both at genotypic and phenotypic levels. There was, however, weak positive association with member of pods per cluster at phenotypic level but it was strong at genotypic level, whereas 100 seed weight had weak positive correlation with seed yield at both the levels. Path co-efficient analysis revealed that number of pods per cluster, number of clusters per plant, number of seeds per plant, days to maturity and plant height had positive direct effect on seed yield. 100 seed weight, though, had highest direct positive effect but the indirect effect via mimber of seeds per pod and days to maturity was highly negative. Indi rect positive effects on seed yield via days to maturity, plant height, number of clusters per plant, number of seeds per plant and number of prosper cluster were also considerable. Present investigation, thus, indicates that number of clusters per plant, plant height and days to maturity may be considered in selection for increasing seed yield in soybean.EnglishThesis