Table 3 Effect of N on photosynthetic CO2 assimilation (Ph, μmol m−2 s−1) in different corn cultivars

From: Effects of nitrogen stress on the photosynthetic CO2 assimilation, chlorophyll fluorescence and sugar-nitrogen ratio in corn

Corn cultivars

Treatment

August 16th

September 6th

September 17th

Jingyu7

LN

20.88 ± 0.57cC

22.94 ± 0.64 cC

16.64 ± 0.54 cC

 

MN

26.69 ± 0.45 bB

34.69 ± 0.98 bB

24.69 ± 0.62 bB

 

HN

33.70 ± 0.88 aA

42.32 ± 1.06 aA

36.72 ± 1.43 aA

Nongda80

LN

18.26 ± 0.66 cC

26.26 ± 0.011 cC

19.24 ± 0.39 cC

 

MN

25.56 ± 0.85 bB

33.43 ± 0.74 bB

27.12 ± 0.48 bB

 

HN

31.67 ± 0.75 aA

41.43 ± 0.42 aA

34.45 ± 0.68 aA

Tangyu10

LN

17.94 ± 0.67 cC

21.64 ± 0.42 cC

14.46 ± 0.24 cC

 

MN

24.59 ± 0.42 bB

32.55 ± 0.87 bB

22.76 ± 0.74 bB

 

HN

29.59 ± 0.67 aA

40.21 ± 1.13 aA

32.43 ± 0.68 aA

  1. Note: The statistical analyses are based on each cultivar. With respect to each cultivar, the values in the same column followed by different uppercase and lowercase letters are significantly different at the 0.01 and 0.05 probability levels, respectively. The corn cultivars were subjected to low (LN, 0 kg N ha−1), medium (MN, 75 kg N ha−1) and high (HN, 150 kg N ha−1) levels of N application over the cropping season (2002 and 2003). The data are average values across 2 years with ± one standard error.
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