Humic acid (Humic Acid, abbreviated HA), is generally considered to be a group of aromatic structure, the nature of similar amorphous acidic substances mixture. Humic acid is a kind of natural organic macromolecule polymer which is decomposed and synthesized by microorganism and geochemical action. Humic Acid It is mainly composed of carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur and other elements. Composition, in addition also contains a small amount of calcium, magnesium, iron, silicon and other elements. Molecular structure is very complex, with aromatic core as the main body, with a variety of functional groups, mainly hydroxyl, phenolic hydroxyl, Humic Acid quinone, alcohol hydroxyl, non-quinone carbon, methoxy and so on. Humic acid is often referred to as humic acid, also includes fulvic acid (phonetic fulvic acid).
Humic acid is brown to black loose powder, Humic Acid soluble in strong alkaline and ethylenediamine and other nitrogen-containing polar organic solvents. Fulvic acid soluble in water and any alkaline, acidic solution and ethanol and other organic solvents. Humic acid has the characteristics of colloid chemistry, surface activity, weak acidity and acid functional groups, ion exchange, complex chelating, redox, chemical stability, Humic Acid photodegradation, chemical modification and so on, but also has biological activity.
Humic acids are widely found in soil, coal, water and other natural environment. Natural humic acid can be divided into soil humic acid, coal humic acid, water humic acid and so on. Humic Acid As the humic acid has a special function, in the sand control, soil improvement, urban sewage treatment, ecological agriculture construction, green agricultural production, drug and health care products development and so play its unique role. Humic acids in the environment of its mainstream is the biological and human health from the protective effect, Humic Acid but there are certain toxicity and pathogenic factors, must be rational use. At present in the fruit industry to develop the main products are fertilizer, pesticides, water-retaining agent.
With the global fertilizer industry, especially the upgrading of fertilizer industry needs, humic acid as an important organic raw materials and green fertilizer, Humic Acid its development more and more attention by the fruit industry. At present, the market circulation of humic acid fertilizer related to solid, liquid two categories.
Humic acid fertilizer can increase economic crops by 15-30%, while significantly improving the quality of agricultural products. Reduce the content of certain heavy metals, nitrates, nitrites, residual pesticides and other harmful substances. Fruit application of humic acid fertilizer, Humic Acid can improve the quality fruit rate, fruit soluble solids content can be increased by 1-2%, heavy color is good, strong flavor, Humic Acid fruit a large. Humic acid as fruit tree fertilizer mainly has the following functions:
① increase soil nutrition. Humic acid in the soil through the adsorption, complexation, chelating, ion exchange and other effects, or indirectly through the activation or so that soil enzymes, Humic Acid nutrient enrichment capacity, can protect and store nutrients. It plays an important role in the formation of nitrogen sources, fixing nitrogen in the atmosphere, promoting the dissolution of insoluble phosphorus and potassium, reducing the loss of various nutrient elements, and promoting the formation of inorganic components in various rocks or minerals Gradually dissolve.
② improve the soil physical structure. Humic Acid The gelling properties of humic acid cause the soil particles to bond to each other to form stable aggregates, which promote the formation of soil aggregates. Humic acid can make the soil color deepened, is conducive to the absorption of solar radiation to improve the ground temperature.
③ improve the soil moisture content. Humic Acid Humic acid can increase the soil water holding capacity of 5 to 10 times.
④ improved soil. Humic acid structure is weak acid - alkaline system, the soil acidity and alkalinity has the ability to adjust and buffer, but also improve the soil cation exchange capacity, reduce soil salt content.
⑤ promote soil microbial activity. Humic Acid For the activities of soil microbes to provide the main source of energy, improve the soil microbial groups, suitable for the growth and reproduction of beneficial bacteria.
⑥ reduce soil pollution. Humic Acid The soil pollutants with a buffer, attenuation. Humic Acid Which can inhibit the activity of nitrifying bacteria and denitrifying bacteria in soil and reduce the conversion of ammonium nitrogen to nitrate nitrogen. And the formation of a small amount of heavy metals in the soil difficult to contain macromolecular chelates, reducing heavy metal pollution.