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為什麼家養盆栽花卉易黃葉

盆花由於盆和土的局限性,根部不能充分擴展,如果管理不善,會比露地花卉更易產生葉子發黃現象。引起盆花葉變黃的主要原因包括:

    原因之一是水分過多。盆土長期過於潮濕,致使土壤缺氧,導致根系腐爛。受害後先是嫩葉變成淡黃色,繼而老葉也逐漸成暗黃色。

    原因之二是乾旱脫水。花卉漏澆或者長期澆半腰水即上濕下幹,會引起葉色暗淡無光澤,葉片萎蔫下垂,先是下部葉片老化,並由下向上變黃枯焦。

    原因之三是長久缺肥。長期沒有施肥或未換盆土,土中營養缺乏,造成枝葉瘦弱,葉子變黃。

    原因之四是施肥過量。施肥濃度過大,導致根細胞液外滲,產生質壁分離,致使老葉邊緣枯焦,甚至整株死亡。

    原因之五是炎熱高溫。喜涼爽或蔭涼的花卉如君子蘭、仙客來、倒掛金鐘等,若放在高溫處讓陽光直曬,極易引起幼葉葉尖或葉子邊緣枯焦。

    原因之六是蔽蔭過度。若把喜光花卉放在光照不足的地方,會導致植株生長衰弱,葉薄而黃,很少開花或不開花。

    原因之七是空氣乾燥。喜濕潤環境的花卉,如果遇到空氣過分乾燥時,會出現葉尖或葉緣枯焦,或葉片上產生焦斑、邊緣捲曲等現象。

    原因之八是缺素症。缺鉀、缺鎂等缺素症,也會引起葉的黃化。

    原因之九是病蟲危害。例如葉斑病,嚴重時整片葉枯黃脫落。紅蜘蛛為害,葉片局部乃至整片葉枯黃。

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