桂花叶子发黄的原因分析和解决办法

植物图片 2019-09-01 11:27

桂花香气扑鼻而来，可放松身心和疲劳的身体。但在种植桂花过程中总会遇到种种问题，比如叶子发黄等。常见叶子发黄的情况有哪些呢。因而我们要了解桂花叶子发黄的原因和解决方法。本文有所介绍哦!一起来看看吧。

桂花叶子发黄

桂花叶子发黄的原因分析和解决办法：

1、浇水过多造成桂花叶子发黄(水黄)：浇水过多，盆土积水久湿，造成土中缺乏氧气，造成部分须根腐烂，因而吸水、吸肥能力减弱，引起嫩叶变成淡黄色，花叶也相继逐渐变成暗黄色。

解决办法：发现后应立即控制浇水、停止施肥，并经常松土，使盆土透气良好。发病严重的，需要将整个土地从盆中脱出，置于干土堆中，使水分迅速渗出，待下垂的枝叶复原后再重新栽入盆中。

2、长期缺水造成桂花叶子发黄(旱黄)：浇水过少，或长期浇半截水或漏浇，使叶子的水分蒸发大于吸收，造成水分供不应求，也会引起叶子发黄。“旱黄”是从下部叶子逐渐向上变黄枯焦脱落的，严重时叶柄下垂呈萎蔫状。

解决办法：需马上将花盆移至阴凉处，向叶面上喷些水，并浇少量水。以后随着茎叶逐渐恢复挺拔，再逐渐增加浇水量，若此时骤然浇过多的水，就有可能造成细胞质壁分离，原生质受到损伤，而引起花卉死亡。

3、暴晒造成桂花叶子发黄(灼黄)：夏天将喜半阴和怕高温炎热的花卉，摆在强光直射处养护，极易造成嫩叶芽或叶缘枯焦或整个叶子发黄。

解决办法：需立即将其移到通风良好的凉爽地方培养。

4、土质偏酸造成桂花叶子发黄(缺光黄)：我国南方地域为红壤土，土壤呈酸性或偏酸性，土中镁元素易流失，叶子因缺镁常表现出老叶、叶脉间首先绿发黄，可施用钙镁磷肥万年青等就会受害，引起叶子发黄脱落。

解决办法：因此，入室后要依据或喷施0.1{bf}至0.3{bf}的硫酸镁溶液。对于酸性土的改良,应注意增施腐熟的有机肥料和施用石灰，施入少量石灰，不仅可以中和土壤酸性，而且能够促进有机肥料料的分解。

5、桂花施肥过多造成叶子发黄(肥黄)：这施肥过多,特别是施氮肥过多而又缺乏磷、钾肥时，容易引起叶子变黄，表现为新叶肥厚，叶面大都凹凸不平，老叶逐渐变黄脱落，严重时叶尖干枯，甚至整个叶子焦黄。

解决办法：遇到此情况应立即施肥，增加浇水量，让肥料从排水孔流出，或立即倒盆，去掉部分陈土，并用水洗冲土坨，换上部分新的营养土，再将植株重新栽入盆内。

6、桂花长期缺肥造成叶子发黄(缺肥黄)：施肥不足，尤其是长期未施氮肥或未换盆土，土中氮素营养缺乏，造成枝叶瘦弱，叶薄而黄。

解决办法：需及时倒盆，将植株脱出，换上一个大一号的盆，装入新的疏松肥沃营养土，将其重新栽好。浇透水后放半明处缓苗。待其恢复生长后施以稀薄的液肥或复合化肥。

7、病虫害造成桂花叶子发黄：这无土盆栽桂花，虫灾首要是蝗虫和红蜘蛛，还有蛴螬。蝗虫在夏秋天取食嫩梢新叶，很简单形成很多叶子残缺，影响盆花外观和长势。

解决办法：可采用4.5{bf}高效氯氰菊酯乳油2000至3000倍液或40{bf}毒死蜱乳油1000倍液等喷雾。

嫩嫩的桂花叶子

桂花养护心得：

1、春天，随着气温的渐渐升高，要逐步把阳台的窗子打开，使阳台内的气温慢慢与外面的气温相适应。当平均气温达到0℃以上后，就可将阳台的窗子全部打开。注意开启窗子不要操之过急，以免桂花受伤。

2、夏天，防止干燥是桂花管理的重要环节。如果阳台空气炎热干燥，通风不畅，对桂花的生长发育非常不利。市民应尽量把阳台的门窗打开，保持空气流通。同时，要增加空气的湿度，可在阳台的地面上铺一层砖或能吸水的蒲席之类的铺垫物，把桂花摆在上面，经常向铺垫物上泼水，使其充分吸水，依靠水分的自然蒸发为桂花创造湿润的环境。另外，在炎热的夏天，要随时向桂花的枝叶上喷水，既可以降低桂花植体的气温，冲洗桂花叶子上的灰尘，又能满足桂花对水气的要求。

3、如果室温低于5℃，花卉也会受害，叶、花、果发黄、干枯、易脱落。

专题： 桂花
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