1、Advancing humic acids extraction procedures: A review of methods

This paper provides a review of various methods for extracting humic acids from coal, focusing on their efficiency, and environmental challenges. Humic acids, a critical organic compound, is used extensively in agriculture to improve soil fertility, in environmental remediation to detoxify pollutants, and in various industrial applications.

2、Humic Acid Fertilizer Improved Soil Properties and Soil Microbial

This study aimed to investigate the continuous effects of humic acid on the physicochemical properties, microbial diversity, and enzyme activities of soil under continuous cropping peanut.

3、Enhancing Carboxyl Groups in Humic Acid with Selective Catalyst to

In this study, we developed oxygen vacancy-rich CuO–Fe 3 O 4 @BC as a novel catalyst containing Cu (I)/Cu (II) and Fe (II)/Fe (III) redox cycling. The catalyst successfully enriched the carboxyl groups of HA by 96.13%, assisted by H 2 O 2.

4、Humic Acid: A Natural Enhancer of Soil Quality and Crop Productivity

Various methods of HA application – including soil application, foliar spraying, seed treatment, root dipping, drip irrigation, and combinations with inorganic fertilizers – are discussed, with soil application consistently identified as the most effective.

5、Research Progress on Activation and Modification Techniques of Humic Acid

These techniques have broadened its applications in agricultural productivity, soil improvement, and environmental protection. This review summarizes the principles and effects of various...

Advances and challenges in humic acid production

Various methods are analyzed, including extraction techniques, catalytic oxidation processes, microbial activation, hydrothermal conversion routes, and solid-phase mechano-activation methods.

Advances and challenges in humic acid production technologies from

Various methods are analyzed, including extraction techniques, catalytic oxidation processes, microbial activation, hydrothermal conversion routes, and solid-phase mechano-activation methods.

Selective Modifier

Efficient use of humic acid (HA) for eco-friendly farming and environmental remediation requires further understanding of how targeted modification of HA affects the chemical structure of HA and thereby its effectiveness in enhancing soil quality.

Advances in the Application of Humic Acid in Agriculture: Impacts on

Through various activation methods, the effectiveness of humic acid can be optimized, further advancing its role in soil improvement and sustainable agriculture.

Enhancing the production and quality of humic acid for sustainable

Dr Zhao Jun has led a team of researchers to develop new ways to produce humic acid, a soil conditioner in organic farming, by using agricultural waste, contributing to sustainable agriculture and waste management.

Humic acid is a critical soil amendment that improves soil structure, enhances fertility, and boosts crop yield and quality. its activity is influenced by various factors, making the enhancement of humic acid activity a complex process. The following strategies are recommended:

1. Selecting Appropriate Raw Materials: The activity of humic acid closely depends on the quality of raw materials. High-quality organic waste (e.g., poultry and livestock manure, crop straw) serves as the primary source for humic acid production. These materials decompose to generate significant amounts of humic acid, thereby increasing its activity. Additionally, selecting suitable microbial strains is crucial. Commonly used microorganisms include bacteria, fungi, and actinomycetes, which accelerate the decomposition of organic matter and promote humic acid formation.

2. Optimizing Fermentation Processes: Fermentation conditions significantly impact humic acid activity. Adjusting parameters such as temperature, moisture, and pH can optimize fermentation. For example, high temperatures, humidity, and acidic environments favor microbial growth and metabolism, enhancing humic acid production. Continuous or batch fermentation methods may also be employed to improve outcomes.

3. Adding Auxiliary Materials: Incorporating auxiliary materials during fermentation can boost microbial growth and metabolic activity, thereby increasing humic acid formation. Common additives include nitrogen, phosphorus, potassium sources, and trace elements, which provide essential nutrients for microbial activity.

4. Controlling Fermentation Time: Fermentation duration critically affects humic acid activity. Insufficient time may limit microbial growth and metabolic efficiency, while excessive time could lead to overproliferation and reduced activity due to byproduct accumulation. Optimal fermentation time must be tailored to specific conditions to maximize activity.

5. Purification and Separation: Impurities such as proteins and polysaccharides in fermented mixtures can diminish humic acid activity. Purification methods like centrifugation, precipitation, and filtration effectively separate these contaminants, improving humic acid purity and activity.

6. Drying Treatment: Drying purified humic acid removes moisture and impurities, enhancing stability and usability. Techniques such as spray drying or lyophilization preserve activity by preventing degradation during storage and transport.

7. Packaging and Transportation: Proper packaging (e.g., plastic or woven bags) and moisture-proof, heat-resistant measures during transportation ensure humic acid remains unaffected by environmental factors.

8. Promotion and Application: Widespread adoption of humic acid requires education and collaboration. Training sessions, educational materials, and partnerships with research institutions and universities can advance knowledge of its benefits for soil health and agricultural productivity.

enhancing humic acid activity demands a systematic approach, addressing raw materials, fermentation processes, additives, timing, purification, drying, packaging, and application. By optimizing these factors, humic acid’s potential to transform soil and agriculture can be fully realized, contributing to China’s agricultural modernization.