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