Humic acid is a mixture of natural organic macromolecular compounds. Humic acid is widely present in nature. The proportion of humic acid in soil is the largest. Soil humic acid is a heterogeneous and complex mixture in physical and chemical terms, with a polydispersed molecular weight. This mixture is composed of natural, high-molecular-weight, yellow to black, amorphous, gel-like, fatty and aromatic organic polyelectrolytes
Physical effect:
Improve soil structure.
Prevent and control soil cracking and erosion.
Increase soil water holding capacity and enhance cold resistance.
Darkening the color of the soil is conducive to the absorption of solar energy.
Chemical reaction:
Regulate the soil pH value.
Improve and optimize the absorption of nutrients and water by plants.
Increase the soil buffering capacity.
Under alkaline conditions, it is a natural chelating agent (chelating with metal ions to promote the absorption of these metal elements by plants).
Rich in organic matter and minerals necessary for plant growth. Improve the solubility of organic fertilizers and reduce their loss.
Transform the nutrients into a state that is easily absorbed by plants.
Humic acid can enhance the absorption of nitrogen by plants, reduce the fixation of phosphorus, protect and store elements such as nitrogen, phosphorus and potassium that have deeply penetrated into the soil in the soil, and accelerate the process of nutrient elements entering the plant body, improving the application effect of inorganic fertilizers. Therefore, it can be said that humic acid is a "reserve" of plant nutrient elements and physiologically active substances.
Biological effect:
Stimulate the growth and reproduction of beneficial microorganisms in the soil.
Enhance the natural disease and pest resistance capabilities of plants.