Genotype X environment interaction was investigated for grain yield in 18 genotypes and varieties of fodder-cum-grain sorghum in six environments during 1985-'87 rabi and summer seasons. There was a significant variation for genotype and genotype X environment interaction for grain yield. Both linear and non-linear components were significant and between the two, the linear component was higher in magnitude. Rabi season characterised by the highest mean maximum temperature of 32°C was congenial for sorghum production. Summer season with a mean maximum temperature above 32°C (with a mean of about 38°C) resulted in reduced grain yield and was found unsuitable for sorghum cultivation. KS 7631, KS 7634 and KS 7637 were found to be most stable with wide adaptability. Tenkasi local and KS 6317 were found to be useful and potential parents for transferring the stability attributes. K 4 was found to be the best performer under unfavourable conditions.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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