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南瓜叶子变黄了怎么回事
更新时间: 2020-09-09 00:00:00  

缺少叶绿素镁,Mg是叶绿素不可缺少的化学元素。缺少它叶就会变黄,镁对植物来讲是可转移的元素,老叶会将其镁传递给嫩叶。Mg在植物体内以不稳定化合物的形式存在,能转移,能多次利用,如果植物体缺乏这类元素,首先在老的部位出现病态。

关键词: 南瓜 叶子 怎么 回事

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