Nitrogen Topdressing Rate Alters Starch and Protein Properties in Grains at Different Spike Positions Under Long-Term Field Conditions.

Effects of Nitrogen Topdressing Rates on the Enzyme Activity of SSS in Grains at Differential Spike Positions The SSS activity showed an overall trend of increasing and then decreasing with the increase in the nitrogen topdressing rates ( Figure 3 ), and the response to it varied among different spike positions.

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With the increasing nitrogen topdressing rates, the soluble sugar content in the middle of the spike showed a trend of increasing and then decreasing.

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