Table 3 Effects of planting date and hybrid maturity on grain yield, kernel water content at harvest stage and kernel density of dryland corn at Lishu city, Northeast China during 2009 and 2010 growing seasons.

	2009			2010
	JD27	XY335	ZD958	JD27	XY335	ZD958
Planting date	Grain yield kg ha⁻¹
D1^c	10064b^a	10549a	10409a	7986C	9022B	10718A
D2^d	10889A	11176A	8560B	8686B	10061A	7700C
Difference	825**	627**	1849**	700**	1039**	3018**
Planting date	Kernel water content at harvest stage %
D1	15.1C	20.8B	28.8A	14.2C	18.4B	24.9A
D2	16.6C	22.9B	31.9A	15.4C	21.0B	27.9A
Difference	1.5**	2.1**	3.1**	1.2**	2.6**	3.0**
Planting date	Kernel density g cm⁻³
D1	1.30b	1.33a	1.30b	1.30ab	1.27b	1.32a
D2	1.31a	1.29a	1.28a	1.27b	1.31a	1.28ab
Difference	0.02NS^b	0.04*	0.02NS	0.03NS	0.04NS	0.04*

^aMeans within a row followed by a different lower-case letter differ at P < 0.05. Means within a row followed by a different upper-case letter differ at P < 0.01.
^bNS, not significant.
^cD1 represents the planting date of maize in early May. The planting dates for 2009 and 2010 were May 2 and May 4, respectively.
^dD2 represents the planting date of maize in mid-May. The planting dates for 2009 and 2010 were May 12 and May 14, respectively.
^*Significant at the 0.05 level.
^**Significant at the 0.01 level.

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