各种花卉营养“饥饿”的症状
花卉有它独特的表达“饥饿”的形式,这就是叶片的形形色色的变化。
缺氮主要表现为发育不良、茎枝细弱、叶瘦小而薄,呈淡绿,下部老叶开始时呈淡黄色,枯叶一般附着不脱落。

缺钾的花卉基部老叶有黄、棕、紫等色斑点;叶尖、叶面组织焦枯向下卷曲;黄化现象自叶缘向里扩展,叶枯萎后易脱落。
缺镁时基部老叶的叶肉组织逐渐失绿变黄,但叶脉仍呈现绿色,叶缘向上或向下卷曲,后期叶片常枯萎。
缺铁主要反应在新生叶上,但顶芽并不死亡。其特点足新生叶叶肉组织出现黄化。如长期或极度缺铁,叶尖,叶缘也会逐渐枯萎并向内扩展,但大叶脉仍然保持绿色。
缺钙虽然也表现在新生叶上,但缺钙植株顶芽容易死亡,而且叶尖、叶缘枯死;叶尖常弯曲呈钩状,根系常坏死,严重时全株枯死。
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