以下为句子列表：
英文: The elongation stage is the key and sensitive stage, the N fertilizer applied at this stage could not only increase the yield of winter wheat but also increase the content of free amino acid and protein of grain, and improve the quality of grain protein.
中文: 冬小麦水氮高效的关键期和敏感期在拔节期，这个时期施氮可以增加子粒中游离氨基酸及蛋白质含量，提高其质量。
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