Combining ability and heterosis studies in cotton (Gossypium hirsutum L.) for yield and fibre quality traits

Cotton is India’s most important cash crop and it used for agricultural industrial purposes all over the world. The greatest way identifying superior hybrids best combiners of parents by L×T design. For analyzing combining ability heterosis various yield attributing variables as well quality traits, viz., four lines testers were crossed to produce sixteen hybrids. MCU5 × KC3 cross contributed positive, highly significant traits number sympodial branches, lint index bolls per plant, along with values sca seed cotton plant micronaire. CO14 NDLH1938 had a effect trait upper half mean length boll weight plant. Therefore, gca value among lines. tester high value, indicating that contributes additive genes testers. some not good have effects. In majority qualities investigated, non-additive or dominant gene action was seen. Heterosis breeding can be exploit amount available vigour.  Keywords: Combining ability, G. hirsutum. L., intraspecific hybrids, heterosis, Cotton.