随著施氮量增加，追施氮肥的利用率明显下降。
The nitrogen utilization efficiency were downtrend with the amount of topdressing increased.
随着施氮量增加，追施氮肥的利用率明显下降。
The nitrogen utilization efficiency were downtrend with the amount of topdressing increased.
随着施氮量增加，追施氮肥的利用率明显下降。
The nitrogen utilization efficiency were downtrend with the amount of topdressing increased.
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