Stability analysis for fodder yield and its contributing traits in forage sorghum [Sorghum bicolor (L.) Moench] hybrids
The present study was undertaken with a view to know the G x E interactions and stability parameters in hybrids of forage sorghum for fodder yield and yield attributing traits. Sixty hybrids, 19 parents and 3 checks were evaluated in a randomized block design with three replications with two dates of sowing under four environments during summer and kharif 2013. Analysis of variance in individual environment as well as on pooled basis revealed highly significant differences among genotypes, parents and hybrids for all the traits. Stability analysis indicated important role of linear and non-linear components in the contribution of total G x E interaction. The linear portion was considerably high for days to flowering, plant height, number of leaves per plant, stem diameter; green and dry fodder yield per plant. It revealed the prediction of performance of genotypes over environments based on regression analysis could be reliable. The hybrid 27A x SRF 323 was more suitable specifically under good farming conditions for green and dry fodder yield per plant, which had significant bi above unity, non significant S2di and high mean value. While, hybrids 27A x SPV 2113 and 27A x SRF 327 were more suitable specifically under poor farming situation for green and dry fodder yield per plant. These stable hybrids also recorded stability for one or more of its contributing traits. For earliness, parents 104A and 27A and hybrid 104A x SRF 328 was found suitable for poor environments, where as hybrid 9A x SPV 2113 was found stable in all the environments. The hybrids 14A x SRF 330 and 104A x SRF 317 was found stable for stem diameter, leaf length and leaf width. For number of leaves per plant, hybrids 14A x SRF 323, 14A x SRF 328, 14A x SRF 331, 27A x SPV 1616 and 104A x SRF 317 were found stable. Thereby, these hybrids can be exploited commercially after testing in wide range of environments.
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