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花卉缺少營養時會有哪些表現

卉的生長發育需要多種營養元素,如果缺乏某種元素時,便表現出生長不良的現象,稱為缺速症。缺速症也是花卉主要生理性病害之以。

由於各種元素在花卉勝利代謝上的功能不同,缺乏時所表現的症狀也有所不同。

1、如缺氧時,植株瘦小,生長勢弱,從下部葉片開始逐漸變黃,甚至枯死。

2、缺磷時,植株矮小,分枝少,有時老葉葉脈出現紫褐色斑點,幼葉變小,影響花芽形成,花小而少,果實發育不良。

3、缺鉀時,莖稈纖弱易折,老葉邊緣幹縮,葉尖及葉緣變成黃褐色甚至枯焦。

4、缺鈣時,有葉尖端彎曲成鉤狀,葉尖、葉緣壞死。

5、缺鎂時,先是老葉葉脈間失綠。嚴重時常出現壞死斑點,葉尖、葉緣向上捲曲,葉片長勺狀。

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