河南烟区
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henan tobacco growing areas 河南烟区
·2,447,543篇论文数据，部分数据来源于NoteExpress
The results showed that:1) The high content of nicotine, the low content of total nitrogen and potassium were found in central and south Henan tobacco-growing areas.
结果表明：1）豫中和豫南两个烟区烟叶的烟碱含量均偏高，总氮和钾含量偏低。
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