Table 5 Effects of planting date and hybrid maturity on number of ears m-2, grain weight per ear, number of grains per ear, and 100-grain weight of dryland corn at Lishu city, Northeast China during 2009 and 2010 growing seasons.

From: Responses of maize hybrids with contrasting maturity to planting date in Northeast China

 

2009

2010

JD27

XY335

ZD958

JD27

XY335

ZD958

Planting date

Number of ears m−2

D1c

6.68aa

6.47a

6.47a

6.68a

6.75a

6.75a

D2d

6.54a

6.47a

6.47a

6.68A

6.40B

6.75A

Difference

0.14NSb

0NS

0NS

0NS

0.35**

0.00NS

Planting date

Grain weight per ear g ear−1

D1

151B

163A

161A

120C

134B

159A

D2

167A

173A

132B

130B

157A

114C

Difference

16**

10*

29**

10**

23**

45**

Planting date

Number of grains per ear

D1

418b

508a

498a

315B

431A

449A

D2

451ABb

530Aa

435Bb

401AB

446A

337B

Difference

33NS

22NS

63*

86*

15NS

112**

Planting date

100-grain weight g

D1

36.4a

32.1a

32.3a

38.0a

31.0b

36.1ab

D2

37.0a

32.6b

30.7b

32.6a

35.3a

34.0a

Difference

0.6NS

0.5NS

1.6NS

5.4NS

4.3NS

2.1NS

  1. 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.
  2. bNS, not significant.
  3. cD1 represents the planting date of maize in early May. The planting dates for 2009 and 2010 were May 2 and May 4, respectively.
  4. dD2 represents the planting date of maize in mid-May. The planting dates for 2009 and 2010 were May 12 and May 14, respectively.
  5. *Significant at the 0.05 level.
  6. **Significant at the 0.01 level.
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