One is to prevent flowers and plants from dying due to lack of oxygen. When it is controversial to water green trees in rainy days, some landscape experts have done science popularization specially, because the oxygen content in rain is very low, and after continuous heavy rain, the oxygen content in soil will be greatly reduced. In order to prevent flowers and plants from dying because of lack of oxygen, watering green trees in rainy days is to increase oxygen content.
We often see some plants die suddenly after rainy days, and many people think that they are killed by excessive soaking in rain. But in fact, only a few plants will drown because of too much water, while most plants cannot survive because of lack of oxygen.
The second is to avoid the breeding of miscellaneous bacteria and lead to plant diseases. In rainy days, some green belts will be flooded by rainwater runoff, and leaves and plants will be stained with dirt. In this case, work can easily breed miscellaneous bacteria, leading to plant diseases. In fact, some flowers or vegetables planted at home in rainy days also need to be washed with water, in order to avoid plants getting sick as much as possible. And sometimes the precipitation in rainy days is not enough to nourish plants, so it is necessary to water plants to alleviate the water shortage problem.
Thirdly, it is convenient to wash the floor and water the green trees in one go in rainy days. Regular cleaning will know that it is easier to clean the ground on rainy days, because the slag on the ground has been softened by rain, which is much more convenient to clean than usual. Sprinklers generally have to clean the ground and water the trees in the green belt at the same time, so often doing these two things together can save a lot of time and labor costs.
It is precisely for these reasons that we often see sanitation workers still working hard in rainy days. They water the trees at this time, on the one hand, to facilitate their work, on the other hand, to protect the health of vegetation. Although trees in green belts are usually very easy to survive, in daily production, the environment they face is far worse than we thought, such as a lot of dust and automobile exhaust.
Therefore, in the process of maintaining them, more scientific basis is needed. Many people don't understand why they water trees when it's already raining, and question others with narrow ideas. However, there must be some reasons why sanitation workers have done this for a long time. After watering in rainy days, the spokesman grows well, which shows that this method is feasible.