residue condition
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烤烟生长发育后期，同一留叶数条件下，叶片NR活性、根系活力随着施氮量的增加呈先升高后降低的趋势；
In the late stage of flue-cured tobacco growth, under the same level of leaf number, leaf NR activity and root activity increased and then decreased with the increase of nitrogen application.
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