I know what the existing soil problem is.

Level 3: I know the existing soil problems are as follows:

1. Soil physical properties. Soil is composed of granular structure, generally speaking, it is composed of small balls. In fertile soil, granular structure has strong ventilation performance and water and fertilizer conservation ability, so that the crops we grow can obtain high yield.

However, it should be known that the aggregate structure of soil is not very solid and is easy to be destroyed. For example, unreasonable farming and extensive use of chemical fertilizers and chemicals will cause serious damage to the aggregate structure of soil. When the aggregate structure of soil is destroyed, it will form hardening, which will affect soil fertility and have a great impact on agricultural planting.

2. Soil chemical properties. Growers all know that the pH value of normal neutral soil is around 7, and the pH value of soil in different planting areas is slightly different. In the process of production and planting, most of the fertilizers used by farmers are acidic, which causes soil acidification, that is, the pH value of soil is less than or much less than 7.

The importance of soil:

1. The importance of soil lies in regulating climate through water cycle, carbon storage and greenhouse gas emission. Soil is the largest carbon pool on land, and its carbon storage is more than twice that of the atmospheric carbon pool. The current land use patterns make the soil carbon pool continuously degraded and threatened.

2. Ten kinds of soils are an important part of the water cycle. They participate in the water cycle, regulate water quantity, water quality and soil quality, and play a key role in the distribution and utilization of water resources.

3. Promote the activities of soil microorganisms, decompose organic matter, release nutrients, form humus, improve soil fertility and structure, promote the activities of microorganisms and animals, and increase the activities of soil enzymes.

4. Soil is one of the important functions to maintain the balance of crop physiological functions, promote the healthy growth of crops and benefit agricultural production.

The importance of soil lies in protecting crops and ensuring crops to grow in a stable environment. In addition, when typhoons and floods hit, soil can also stabilize plants and prevent crops from being easily damaged.