1、 Causes of occurrence

1. The main reason is that too much water was given during the maintenance of it, resulting in its root blocked by water and unable to breathe normally, so that the root slowly decayed and necrotic

2. Another main reason is that the density of fertilizer is high and the application times are too many, so that its roots are piled up by many nutrients and can't breathe, which will also cause the root system of plants to rot

2、 How to solve it

1. When breeding plants, we must do a good job in water management. We can't lose too much because of small things. If we don't grasp the amount of water, we can pour half of it first, and then half. In this way, we can reduce water logging

2. If rotten roots have been caused, take out the roots of the plant immediately, remove the soil at its roots, trim the damaged parts, and then apply bactericidal and disinfection drugs on the wound. After it is dry, replant it

3. If you accidentally apply a lot of heavy fertilizer, you can buffer it with water and dilute it. However, if you have more water, you can't use water to fertilize. The soil of the plant needs to be replaced