Line x Tester analysis involving 34 females and 3 males from diverse origin revealed that both additive and non additive gene actions were important in controlling days to 50% tasseling, days to 50% silking and days to 50% brown husk maturity. A female parent HYD.SEL 13, and a male parent, CI-5 were good general combiners for earliness and grain yield. The crosses viz., HYD.SEL 8 x CI-5, NG-4 x CM-III and CML 114 x CI-4 showed significant sca effects as well as heterobeltiosis. These hybrids are of late maturity and high yielding. Such hybrids could be exploited for commercial hybrid seed production. On the contrary, among early hybrids the hybrid HYD.SEL 13 x CI-15 is the best for commercial exploitation of hybrid vigour.