1、缺钾:症状:生长缓慢,节间短,叶面积缩小,小叶排列紧密,与叶柄形成较小的夹角,叶面粗糙、皱缩并向下卷曲。早期叶片暗绿,以后变黄,再变成棕色,叶色变化由叶尖及边缘逐渐扩展到全叶,俗称“镶金边”,下部 ...
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