First, improve the soil and improve the role of fertility The Humic Acid-containing Organic Fertilizer can promote the formation of soil structure and improve the pore condition; improve the cation absorption capacity of the soil, increase the ability of the soil to retain fertilizer and provide fertilizer; strengthen the soil buffer system, improve the acidic soil; and promote the activities of soil beneficial microorganisms. The specifics are: 1. 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. 2, 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. 3, 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. The 4, the 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. The 5. Humic acid can form complexes with trace elements such as iron (Fe), aluminum (Al), copper (Cu), manganese (Mn), and zinc (Zn) in the form of some insoluble salts, which are soluble in water. Crop absorption. 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. 6. Reducing the fixation of soluble phosphorus in soil increases the utilization rate of phosphate fertilizer and promotes the activation of soil trace elements. Usually calcium phosphate [Ca3(PO4)2] in soil is difficult to dissolve in water, and it is formed by the reaction after adding humic acid. Both hydrogen phosphate and dihydrogen phosphate are soluble in water and can be absorbed by crops. Second, increase crop nutrition and synergies with chemical fertilizers The humic acid-containing organic fertilizer can increase the fertilizer effect, and can eliminate the adverse effects caused by excessive nitrogen fertilizer application or improper application methods, so that the fertilizer effect of inorganic nitrogen fertilizer changes from "burst, fierce, and short" to "slow, steady, and long"; Fertilizer itself also contains a certain amount of available nitrogen, phosphorus and delayed nitrogen and phosphorus, which can play a role in improving crop nutrition. Third, the stimulation of crop growth and development The humic acid-containing organic fertilizer can make the seed germinate earlier, increase its emergence rate; promote rooting and increase the absorption capacity of the root; enhance the development of reproductive organs.