1. Provide comprehensive nutrients: Organic fertilizer contains the nutrients and various beneficial elements needed by crops, and the nutrient ratio is comprehensive, which is conducive to crop absorption. Therefore, the more organic fertilizer is applied, the more conducive it is to the balance of soil nutrient ratios, and the more conducive it is to the absorption and utilization of soil nutrients by crops. It will not cause a large increase in certain nutrient elements in the soil due to excessive application of organic fertilizer, which will destroy the balance of soil nutrients.

2. Promote the breeding of soil microorganisms: Organic fertilizer contains a large amount of organic matter, which is a place for various microorganisms to grow and breed. According to Huang Jingchun's research, deep plowing combined with the application of organic fertilizer can increase soil nitrogen-fixing bacteria by nearly one-fold compared with the control, and fiber-decomposing bacteria by nearly two-fold. Other microbial communities have also increased significantly, so the application of organic fertilizer can greatly promote the maturation process of newly reclaimed land. In addition, organic fertilizer can also produce various phenols, vitamins, enzymes, auxins and other substances during the decomposition process, which can promote the growth of crop roots and the absorption of nutrients.

3. Improve the soil's ability to retain fertilizer and water: All organic fertilizers have strong cation exchange capabilities, can absorb more nutrients such as potassium, ammonium, magnesium, zinc, etc., prevent leaching, and improve the soil's ability to retain fertilizer, especially the mature organic fertilizers. In addition, organic fertilizers also have strong buffering capacity, which can prevent acidity changes and soil compaction caused by long-term application of chemical fertilizers, improve the soil's own resistance to stress, and ensure a good ecological environment for the soil.

4. Reduce nutrient fixation and improve nutrient effectiveness: Organic fertilizers contain many organic acids, humic acid, hydroxyl and other substances, all of which have strong chelating ability and can chelate with many metal elements such as manganese, aluminum, iron, etc. to form chelates, which can reduce the harm of manganese ions to crops. It can also prevent aluminum from combining with phosphorus to form closed phosphorus that is difficult to be absorbed by crops and become invalid, greatly improving the effectiveness of effective phosphorus in the soil.

5. Accelerate the formation of aggregates and improve physical and chemical properties: Organic-inorganic aggregates are an important indicator of soil fertility. The more it contains, the better the physical properties of the soil, the more fertile the soil, the stronger its ability to retain soil, water and fertilizer, the better its aeration performance, and the more conducive it is to the growth of crop roots.