Table 4 Effects of planting date and hybrid maturity on aboveground biomass at harvest stage, and harvest index of dryland corn at Lishu city, Northeast China during 2009 and 2010 growing seasons.

	2009			2010
	JD27	XY335	ZD958	JD27	XY335	ZD958
Planting date	Aboveground biomass at harvest stage kg ha^-1
D1^c	16487Bb^a	19054A	17273Ba	16323b	17158b	19496a
D2^d	16904B	19859A	15975C	15289b	18774a	17724a
Difference	418NS^b	805**	1298**	1034NS	1616NS	1772NS
Planting date	Harvest index %
D1	61.0A	55.4C	60.3B	49.2b	52.6ab	55.1a
D2	64.4A	56.3B	53.6C	56.8A	53.6A	43.9B
Difference	3.4**	0.9**	6.7**	7.6*	1.0NS	11.2**

^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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