STABILITY ASSESSMENT IN LATE DURATION RICE HYBRIDS

Abstract

Analysis of variance carried out for eight quantitative traits on twenty-five genotypes (twenty-one hybrids and four check varieties) revealed significant genotypic differences at all the five locations for al the traits. Genotypes x location interactions were found to be significant for all the characters except 1000-grain weight. The variance due to genotype x location (linear) was significant only for days to 50% flowering. Non-linear component was found to be significant for all the characters. Among the 25 genotypes studied, only six rice hybrids had given significantly superior yield than populations mean. Out of these, two late rice hybrids viz., IR 58025 A/Karjat 14-7 and IR 68885 A/IR 5 had high potential and showed unit regression coefficient with non-significant non-linear component for grain yield/ha as well as for most of the yield contributing characters and hence suitable for all the environments in Konkan region of the Maharahtra State. While four late rice hybrids viz., IR 58025 A/IR 5, IR 58025 A/Ratnagiri 3, PMS 2 A/Ratnagiri 3 and IR 58025 A/Swarna had high yielding ability and showed significant regression coefficient greater than unity with non-significant no-linear component for grain yield/ha as well for most of the yield contributing characters. Therefore, these hybrids may be suitable in favorable environments only.