Table 1.

Descriptives of heading date for Hua-jing-xian 74 (HJX74) and single segment substitution line (SSSL) population in the spring and the fall.

Environment	HJX74			SSSL population
	Mean (days)	SD (days)	N	Mean (days)	SD (days)	Min (days)	Max (days)
The spring	103.85	10.96	201	104.33	6.42	83.30	126.65
The fall	71.00	6.89	197	70.99	4.15	53.75	92.60
Average of both	87.43	9.15	397	87.83	17.55	53.75	126.65