Table 2 Effect of N on the maximum quantum yield of PSII (Fv/Fm) 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

0.709 ± 0.022 cC

0.815 ± 0.007 cC

0.796 ± 0.005 cB

 

MN

0.726 ± 0.015 bB

0.826 ± 0.008 bB

0.812 ± 0.006 bA

 

HN

0.757 ± 0.005 aA

0.835 ± 0.006 aA

0.824 ± 0.007 aA

Nongda80

LN

0.702 ± 0.013 cC

0.812 ± 0.011 cC

0.793 ± 0.009 bB

 

MN

0.725 ± 0.012 bB

0.824 ± 0.009 bB

0.815 ± 0.006 aA

 

HN

0.749 ± 0.015 aA

0.837 ± 0.011 aA

0.822 ± 0.004 aA

Tangyu10

LN

0.695 ± 0.017 bB

0.782 ± 0.022 bB

0.755 ± 0.011 bB

 

MN

0.719 ± 0.012 aA

0.816 ± 0.012 aA

0.792 ± 0.019 aA

 

HN

0.738 ± 0.007 aA

0.825 ± 0.007 aA

0.817 ± 0.009 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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