灌浆前期硝酸还原酶活性较高，后期迅速降低。
研究结果，硝酸还原酶活性随氮素用量不同而发生变化。
The result showed that the activity was different to the change of quantity of nitrogen.
研究结果，硝酸还原酶活性随氮素用量不同而发生变化。
The result showed that the activity was different to the change of quantity of nitrogen.
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