In the present investigation, all together 32 hybrids were made from crosses of four cytoplasmic male sterile lines and eight diverse testers in a line x tester matting design. These hybrids were evaluated during Rabi 2014-15 at TCA, Dholi Farm. The mean sum of squares for parents and crosses, were found significant for all traits except seed filling per cent. The significance of variance due to parents Vs crosses indicated the presence of heterosis in hybrids for all characters except days to 50% flowering and harvest index. | Determining combining ability in sunflower Helianthus annus L.
