Table 1.

Performance of the basic generations (the parental line Zheng 58, Chang 7–2 and the hybrid Zhengdan 958) and heterosis for plant height (PH) and ear height (EH) in five environments

Trait	Environment	Zheng58	Chang7-2	MP	F1	MPH (%)
PH	E1	183.19 ± 10.03	199.86 ± 8.47**,a	191.52	268.75 ± 12.61**,b	40.32c
	E2	148.28 ± 11.40	175.32 ± 11.93**	161.80	209.67 ± 9.84**	29.59
	E3	175.37 ± 7.88	205.21 ± 11.97**	190.29	247.20 ± 12.77**	29.91
	E4	161.19 ± 7.63	210.50 ± 6.27**	185.84	247.97 ± 8.57**	33.43
	E5	180.52 ± 8.36	215.01 ± 6.88**	197.77	247.75 ± 6.96**	25.27
EH	E1	68.90 ± 7.95	102.81 ± 10.25**	85.86	123.58 ± 10.04**	43.94
	E2	45.63 ± 3.86	84.03 ± 6.09**	64.83	86.73 ± 7.72**	33.78
	E3	61.14 ± 6.65	101.26 ± 9.40**	81.20	114.26 ± 8.28**	40.71
	E4	51.07 ± 5.65	101.13 ± 2.86**	76.10	105.56 ± 4.84**	38.71
	E5	61.41 ± 5.57	104.43 ± 6.43**	82.92	104.23 ± 5.98**	25.70

^** P ≤ 0.01

^aComparison between Zheng 58 and Chang 7–2 using t test; ^bComparison between midparent (MP) and F₁ using t test, ^cMid-parent heterosis (MPH): (F₁-MP)/MP × 100