Humic acid is widely found in peat and lignite. Peat and other substances are organic ore bodies formed by long-term biological and physical chemistry of plant residues, which contain a large amount of humic acid. Humic acid is a black or brown colloidal substance that is a large class of polycyclic fused-ring organic compounds that have a good effect on enhancing soil fertility and improving soil structure.
Enhanced fertility
1. Reducing the fixation of soluble phosphorus in the soil, increasing the utilization rate of phosphate fertilizer, and promoting the activation of trace elements in the soil. Usually, Ca3(PO4)2 in the soil is difficult to dissolve in water, and the hydrogen phosphate formed by the reaction of humic acid is added. Dihydrogen phosphate is soluble in water and can be absorbed by crops.
2 , humic acid can form complexes with trace elements such as Fe , Al , Cu , Mg , Zn, etc. in the form of some insoluble salts , dissolved in water and absorbed by crops. The commercial chelation of these trace elements is very expensive. Generally, farmers are reluctant to buy and humic acid can be used as a source of low-cost natural chelating agents to chelate with trace elements to make them easily absorbed by crops.
Improved soil structure
1. Promote the formation of soil aggregates. Ammonium humate can promote the formation of soil aggregate structure. The application of organic fertilizer to the soil can also improve the soil structure, which is mainly through the slow transformation of soil microorganisms. If the humic acid fertilizer is frequently applied, the transformation process will be accelerated.
2. It is conducive to the regulation of water, fertilizer, gas and heat in the soil. When the agglomerate structure of the soil becomes better, the bulk density is reduced and the void fraction is increased to have good permeability. The color of the humic acid fertilizer is also beneficial to the absorption of solar heat. When the humic acid fertilizer is decomposed by the action of microorganisms, the heat is released, especially when the seedlings of the early spring crops are unearthed, the ground temperature is raised and the spring cold effect is exerted.
3. Renovate poor soil and saline-alkali land. Long-term adherence to the application of humic acid fertilizer will fundamentally transform the poor soil into a good field. In the south, the use of humic acid fertilizers to improve the "acid, sputum, plate, dry" red soil has also achieved outstanding results. Since acidic humic acid and saline and alkaline soil, the humic acid may be adjusted so that the soil pH (pH) to achieve the effect of saline control.
4. Promote the activity of soil microorganisms. After the application of humic acid fertilizer in the soil, the activity of microorganisms in the soil is aggravated, especially the soil autotrophic nitrogen-fixing bacteria increase significantly, so that the nitrate content is significantly increased, enriching the soil nitrogen nutrition and improving the crop root system. Nutritional conditions.
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