中國有相當大範圍土質貧瘠，缺乏微量元素。自八十年代起在許多地區推廣鉬肥，林縣也是試點之一。

來源: fuz 於 2019-05-04 09:44:06 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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