Function of humic acid
Main function of humic acid (Humic substance) is decided by the its structure , main elemental composition of humic acid is carbon, hydrogen, oxygen, nitrogen, sulfur, and is a polycondensate of a polyvalent phenolic aromatic compound and a nitrogen compound.
Widely distributed in low-grade coal, soil, water sediments, animal manure, organic fertilizers, animal and plant residues, etc.
1.Stimulate physiological metabolism.
Humic acid contains a variety of active functional genes, which can enhance the activity of catalase and polyphenol oxidase in crops, stimulate physiological metabolism and promote growth and development.
For example, humic acid can promote early germination of seeds, and the emergence rate is high, especially at low temperatures, it can stimulate the division and growth of root meristem cells, so that the roots of the seedlings are fast, the roots are increased, the roots are increased, and the roots are elongated. Increase the ability of crops to absorb water and nutrients.
Therefore, the nutrient supply is sufficient, the crop stems are fast and robust, the foliage is flourishing, the photosynthesis is enhanced, the nutrient is accelerated to the fruiting body, and the fruit is prematurely colored and matured.
2. Humic Acid function to Change the characteristics of fertilizer.
Humic acid contains carboxyl, phenolic hydroxyl and other functional groups, has strong ion exchange and adsorption capacity, can make ammonium bicarbonate reduce the loss of ammonium nitrogen, and improve the utilization rate of nitrogen fertilizer. Oxidatively degraded nitro-humic acid can inhibit urease activity and reduce urea volatilization.
The degraded nitro-humic acid increases the distance of phosphorus movement in the soil, inhibits the fixation of water-soluble phosphorus in the soil, converts the available phosphorus into delayed-effect phosphorus, and promotes the absorption of phosphorus by the roots.
Humic acid and poorly soluble trace elements can chelate and form humic acid trace element chelate which is well absorbed by crops, which is beneficial to the absorption of trace elements by roots and leaves.
3.Improved soil structure.
Humic acid can promote the formation of soil aggregate structure, regulate soil pH, regulate soil water, fertilizer, gas, heat and other conditions, increase soil exchange capacity, achieve acid-base balance, improve soil water and fertilizer retention capacity, and promote soil microbial activities.
Increase the number of aerobic bacteria, actinomycetes, and cellulolytic bacteria, accelerate the decomposition and conversion of organic substances, promote the release of nutrients, and facilitate the absorption of nutrients by crops.
4.Enhanced resistance to stress.
Humic acid can reduce the stomata opening strength of plant leaves, reduce leaf transpiration, reduce water consumption, improve the water status of plants, ensure the normal growth and development of crops under drought conditions, and enhance drought resistance.
Humic acid is mostly amphoteric colloid, which has large surface activity and inhibits fungi. It can enhance crop coldness, be easily adsorbed by cell membrane, change cell membrane permeability, promote absorption of inorganic nutrients, prevent rot disease, root rot, and reduce pests and diseases. .
5 .Humic acid function to Improve the quality of the yield.
Humic acid can form complexes or chelates with trace elements, increase the amount of trace elements moving from roots to leaves or other parts, regulate the ratio and balance of macroelements and trace elements, and strengthen enzymes for sugar, starch, and protein, the synthesis of fat and various vitamins.
It can promote the activity of the enzyme, convert the polysaccharide into soluble monosaccharide, increase the synthetic accumulation of starch, protein and fatty substances, accelerate the metabolism of the primary products from the stems or leaves to the fruits and seeds, and make the fruit full and thick.