Table 6 Effects of planting date and hybrid maturity on number of grains m⁻², and volume of grains m⁻² of dryland corn at Lishu city, Northeast China during 2009 and 2010 growing seasons.

^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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