Humic acid is widely found in peat and lignite. Peat and other substances are organic ore bodies formed by long-term biological and physical chemical reactions of plant residues, and contain a large amount of humic acid. Humic acid is a black or brown colloidal substance is a large class of polycyclic fused ring organic compounds, these substances have a good effect on enhancing soil fertility and improving soil structure.
Increase fertility
1. Reducing the fixation of soluble phosphorus in soil increases the utilization of phosphate fertilizer and promotes the activation of trace elements in soil. Usually, Ca3(PO4)2 in soil is hardly soluble in water, and the addition of humic acid results in the formation of hydrogen phosphate and 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, and Zn that exist in the form of some insoluble salts, which are soluble in water and absorbed by crops. The commodity chemical chelating fertilizer of these trace elements is expensive and the average farmer is unwilling to purchase humic acid. The humic acid can be used as a source of cheap natural chelating agent and chelating trace elements to make it easily absorbed by crops.
Improved soil structure
1, to promote the formation of soil particles. Ammonium humate can promote the formation of soil aggregates, and the application of organic fertilizers to the soil can also improve the soil structure. This is mainly due to the slow conversion of soil microorganisms. If humic acid fertilizers are applied regularly, this transformation process will be accelerated.
2. It is conducive to the regulation of water, fertilizer, gas and heat in the soil. When the granule structure of the soil becomes better, its bulk density decreases and the porosity increases, so that it has good permeability. Because of the deep color of humic acid fertilizers, it is beneficial to the absorption of solar thermal energy. When the humic acid fertilizer is decomposed by the action of microorganisms, heat is released, especially when the seedlings of the early spring crops have just emerged, the temperature of the soil can be increased and the anti-cold effect can be achieved.
3, transformation of poor soil and saline land. The long-term application of humic acid fertilizers will fundamentally transform poor soil into fertile land. The use of humic acid fertilizers in the south to improve red soils such as "acid, sorghum, board, and dry" has also achieved outstanding results. Since the acidity of humic acid can be neutralized with that of saline-alkali soil, humic acid can adjust the pH of the soil to achieve the effect of salinization.
4, to promote soil microbial activity. The application of humic acid fertilizers in soil has aggravated the activity of microorganisms in the soil, and in particular, the amount of soil nitrogen-fixing bacteria has increased significantly. This has led to a significant increase in nitrate content, which enriches the soil's nitrogen nutrition and improves the crop root system. Nutritional conditions.
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