夏季中午为什么不能给花浇水?
给花浇水,水温应尽量与土温接近,水温过高、过低都会对根系造成不利影响。特别是在烈日暴晒的中午,花卉叶面温度可高达40℃左右,蒸腾作用强,水分蒸发快,根系需不断吸收水分;
如果突然给盆花大量浇水,土壤温度突然降低使根系受到低温刺激,阻碍对水分的正常吸收,植株便立即处于枝叶下垂的萎蔫状态。根系严重损伤的植株,还可诱发立枯病;引起植株死亡。
这种现象在草本花卉中尤为明显。水温与盆土温差超过5℃以上,便有可能损伤根系,对植株构成威胁。一般来说,浇花的水温,冬季可比土温偏高几度,夏季可比土温偏低几度,春秋二季则以与土温接近或相等最好。
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