柠檬叶子发黄怎么办

植物图片 2021-04-26 14:27

柠檬叶子发黄主要有四种情况。第一缺铁或氮，需针对性补充。第二营养不足，需补充肥料，一般需喷施。第三根系腐烂导致，最有可能是积水引起。需将烂了的根处理干净，伤口愈合后盖土。第四有虫害，需喷洒相应的药剂。

1、补充铁或氮元素

（1）具体原因：这两种元素缺乏都可能使叶子发黄，不过部位不一样。如缺铁，那么回叶肉变黄；如缺氮，它的叶脉会发黄。因此，可根据不同的症状确定到底该补充哪一种元素。

（2）解决措施：观察叶子的发黄部位，针对性地补充相应的元素。

2、补充肥料

（1）具体原因：这种情况在开花时比较多发。这时需要的营养本来就多，若是不注重补充，很可能导致叶子泛黄。

（2）解决措施：需喷施一些肥料，比如磷酸二氢钾溶液。其中不仅含有氮、磷、钾等基本的元素，还有一些微量元素。往叶片上喷，半个月一次就行。

3、处理烂根

（1）具体原因：如根部腐烂，也可能使得叶子发黄。最有可能使根部腐烂的原因是积水太多，或肥料太浓。

（2）解决措施：需将烂掉的部分及周围一小部分都用刀刮除，并涂抹一些托布津。等到切口完全复原之后，再盖土。之后还需注意浇水不可太多，也不要施浓度太高的肥料。

4、防治虫害

（1）具体原因：生虫害之后，也可能危及到叶子，使其变黄。

（2）解决措施：如数量少，可人工除虫。如数量多，则喷相应的药剂。

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