蟹爪兰茎节萎蔫的原因?
蟹爪兰茎节萎蔫的原因,蟹爪兰出现茎节萎蔫、花蕾半开就脱落的现象,可能有以下三个方面的原因:
一是根系腐烂,或因浇水过多,或因施肥过多、过浓等,导致蟹爪兰植株出现烂根,使其失去了向上输送水分和养分的功能,从而致使茎节萎蔫、花朵半开即脱落。
二是植株因突然降温而受寒害,或昼夜温差太大,一夜之间气温猛然大幅度下降,使砧木因受寒害而停止生长,有时满株花蕾都会落光,特别是以三棱箭作砧木的蟹爪兰植株,气温降到15℃时就停止生长,砧木一旦停止生长,水分养分供应就受到限制,必然引起落蕾和茎节萎蔫,若气温突然在一夜间降到10℃以下,也会发生落蕾掉苞。
三是盆土过干、空气过分干燥、蚧壳虫类严重危害等,也有可能导致蟹爪兰茎节不正常和出现落蕾。为了挽救蟹爪兰植株,可待盆土稍干时,在室内将其从花盆中脱出,抖去部分宿土,检查根系的受损情况,若因盆土过湿、肥料过大或盆土过干造成了根系严重受损,可先将坏死的根系剪去,直到根系断面新鲜为止,重新改用干净疏松的沙质培养土栽种;在催根期间,应维持不低于15℃的室温,多喷水少浇水,并给予一定的光照和较高的相对空气湿度,待植株催生出新根后再更换较肥沃的培养土,并给予正常的水肥管理。
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