Difference of growth period of parents (days) | No. of crosses combination of different heterosis | Total No. of combination | Average heterosis index (%) | |||
<100 | 100 - 120 | 120 - 140 | >140 | |||
0 - 5 | 19 (17.1)* | 56 (50.5) | 27 (24.3) | 9 (8.1) | 111 | 115.77 |
6 - 15 | 2 (3.6) | 20 (36.4) | 22 (40.0) | 11 (20.0) | 55 | 125.90 |
>15 | 3 (12.0) | 10 (40.0) | 4 (16.0) | 8 (32.0) | 25 | 133.75 |