Manipulating Planting Density and Nitrogen Fertilizer Application to Improve Yield and Reduce Environmental Impact in Chinese Maize Production.

The activity of these two enzymes shows an increasing trend with increased N applications within a certain range, thus, they enhance the accumulation of photoproduct and transshipment; however, the activity of SPS decreases when the N is excessively applied, which can explain observed decreases in the number of kernel per ear and TKW ( Shen et al., 2007 ; Li et al., 2012 ), leading to low GY ( Table 1 and Supplementary Figure S1 ).

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