There is a kind of fertilizer, which is a slow-release agent of nitrogen fertilizer, a synergist of phosphate fertilizer, a protective agent of potash fertilizer, and a chelating agent of middle and trace elements. It is a humic acid fertilizer.

Humic acid itself contains the elements carbon, hydrogen, oxygen, nitrogen, etc. required for plant growth. At the same time, it can increase the utilization rate of nitrogen, phosphorus, and potassium fertilizers. Therefore, humic acid has a very obvious effect on increasing crop production.

The application of humic acid fertilizer and organic-inorganic compound fertilizer is compared with the application of chemical fertilizer: the yield of general field grain and oil crops is increased by about 8% to 20%, and the yield of fruits, vegetables, and cash crops is generally increased by about 15% to 35%.

Direct action

Promote plant growth and increase crop yields.

Indirect effect

①Physical action

A. Improve soil structure.

B. Prevent soil cracking and erosion.

C. Increase soil water holding capacity and improve cold resistance.

D. Darken the color of the soil, which is beneficial to the absorption of solar energy.

②Chemical action

A. Adjust the pH of the soil.

B. Improve and optimize the absorption of nutrients and water by plants.

C. Increase soil buffer capacity.

D. Under alkaline conditions, it is a natural chelating agent (chelates with metal ions to promote absorption by plants).

E. Rich in organic matter and minerals necessary for plant growth.

F. Improve the solubility of organic fertilizers and reduce the loss of fertilizers.

G. Transform nutrient elements into a state that can be easily absorbed by plants.

H. It can strengthen the absorption of nitrogen by plants, reduce the fixation of phosphorus, can store the nitrogen, phosphorus and potassium and other elements deep in the soil in the protective box, and can accelerate the process of nutrient elements entering the plant body, and improve the application of inorganic fertilizers Effect, so humic acid is the "reserve" of plant nutrients and physiologically active substances.

③Biological effects

A. Stimulate the growth and reproduction of beneficial microorganisms in the soil.

B. Improve the ability of plants to resist natural diseases and pests.