文竹发黄是什么原因
文竹发黄是什么原因,文竹纤细秀丽,青翠欲滴,茎干挺拔,云片重叠,十分惹人喜爱。但盆栽文竹的枝叶常常容易变黄。造成文竹枝叶发黄的原因大体有下列七个方面:
(1)光照太强。文竹喜半阴,夏季在阳光下受直接照射,光照过强,极易造成枝叶枯黄。
(2)浇水不得当。文竹喜湿润的环境,但忌积水。因根稍肉质,一经缺水,新枝顶梢萎蔫枯死,严重者甚至叶状枝变黄脱落,进而造成全株死亡。
(3)养分不足。文竹性喜肥,对氮肥和钾肥需要较多。如果长期不施肥,也不换盆换土,会使养分供不应求,出现枝叶发黄现象。
(4)施肥不当。如施追肥过浓或施未经腐熟的肥料,都容易引起“烧根”,导致叶子干枯和脱落。
(5)温度过低。文竹喜温暖,冬季气温低于5℃,轻者枝叶枯黄,重者全株冻死。
(6)中毒。文竹怕烟尘,若遇到有毒气体,则枝叶易发黄。
(7)虫害。文竹在受到红蜘蛛、蚜虫、介壳虫等害虫危害时,也会造成枝叶发黄。
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