花卉需水不同类型
水分对花卉的影响是十分重要的。不同种类的花卉对水分的要求是不一样的,除水生花卉须大量水分外,陆生花卉根据需求水分的多少可分为以下三类。
(1)旱生花卉:如昙花、仙人掌、石莲花、虎刺梅、令箭荷花等,它们在较干旱的情况下,仍能继续生长,一般不抗涝,供水多了容易引起腐烂。
(2)湿生花卉:如旱伞草、金鸡腊、何氏凤仙等,不耐干早,喜大水分。
(3)润土花卉:如菊花、玉兰、桂花、茉莉、海桐、月季花、米兰花、四季海棠等,需要土壤湿度较大,用水量介于旱生花卉和湿生花卉之问。

具体到某一种花卉在某一种生长发育阶段是否需要浇水,有经验的养花者可以从下面几点作出判断:
(1)看色浇水。即看盆土的颜色,当盆土呈现灰白、表土已出现干燥时,证明盆土已干,如值盛夏或旱秋就需要浇水,如在早春、深秋、冬季则不需要浇水或要少浇水。
(2)揿土浇水。即用手指揿盆土,如盆土比较坚硬、干燥、用手捏表土成粉末状,证明盆土已干,需要浇水。
(3)听音浇水。采取敲盆听音的方法,也就是用手指上下轻敲花盆,如发出“壳壳”的清脆声时,表示盆土已干,即需要浇水。若发出“朴、朴”的闷浊音时,证明盆土还潮湿,即不需要浇水。
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