What exactly are the effects of humic acid?

Release Date:

2019-07-15

As issues such as soil acidification gain wider recognition, more and more growers are placing greater emphasis on rational fertilization, and organic fertilizers are receiving increasing attention. In recent years, liquid humic acid fertilizers have been adopted by a growing number of farmers, who have reaped significant benefits. So what exactly are the functions of humic acid? Let’s find out together! The Effects and Applications of Humic Acid on Crops Humic acid, black humic acid, and brown humic acid are collectively referred to as humic substances. Among them, humic acid stands out for its low molecular weight, high content of active functional groups, ability to improve soil quality, raise soil temperature, promote robust root development, effectively regulate soil pH, and alleviate soil compaction—possessing unique advantages in these areas.

　　As issues such as soil acidification gain wider recognition, an increasing number of growers are placing greater emphasis on rational fertilization, and organic fertilizers are receiving growing attention. Humic acid Liquid fertilizers—particularly humic acid–based liquid fertilizers—have been increasingly adopted by a growing number of farmers in recent years, yielding tangible benefits. So what exactly are the functions of humic acid? Let’s find out!

　　The Effects and Applications of Fulvic Acid on Crops

　　Humic acid, fulvic acid, and brown humic acid are collectively referred to as Humic acid Among them, humic acid exhibits unique benefits such as a low molecular weight, high content of active functional groups, soil improvement, increased soil temperature, promotion of robust root development, effective regulation of soil pH, and alleviation of soil compaction. Under arid climatic conditions, it reduces the degree of stomatal opening in crops, commonly referred to as “Drought‑Resistance No. 1.”

　　Its primary applications include wheat, corn, sweet potatoes, millet, rice, cotton, peanuts, rapeseed, tobacco, sericulture, melons and fruits, and vegetables. In practical agricultural settings, humic acid demonstrates the most consistent and optimal performance.

　　The effects of humic acid on soil, fertilizers, and plants in the agricultural sector are as follows:

　　Characteristics of humic acids: They exert both direct and indirect effects (as shown in the figure below).

　　Direct action: promotes plant growth and increases crop yields.

　　Indirect effects are classified into physical, chemical, and biological actions.

　　① Physical action:

　　Improve soil structure. Prevent soil cracking and erosion, increase soil water-holding capacity, and enhance cold resistance.

　　It darkens the soil color, facilitating the absorption of solar energy.

　　When used in combination with other inorganic fertilizers—such as nitrogen, phosphorus, and potassium—humic acid can fix nitrogen, solubilize phosphorus, and release potassium slowly, facilitating the conversion of active nutrients and enabling crops to absorb and utilize them more rapidly, thereby increasing the utilization rate of these nutrients to over 80%.

　　Application of Fulvic Acid in Vegetable Production

　　It primarily prevents soil-borne continuous‑cropping disorders and pathogen infections; effectively suppresses the reproduction of soilborne pathogens; enhances soil aggregate structure, encouraging robust root development and the growth of new roots, thereby promoting a well‑developed root system, improving plant disease resistance, stimulating vegetable growth, boosting photosynthesis, ensuring vigorous vegetative growth, increasing yield per unit area, and raising farmers’ incomes.

Applications of Fulvic Acid in Agriculture

　　Application of Fulvic Acid in Fruit Trees

　　It promotes robust root development in fruit trees, enhances fertilizer use efficiency, increases fruit set, intensifies the color of fresh fruit, improves fruit quality, extends post-harvest storage life, prevents root rot, and effectively helps to restore diseased trees and branches.

　　Humic acid is also widely applied to cotton, corn, wheat, melons, and fruit crops, with yield‑increasing effects that are notably more pronounced than those of inorganic fertilizers.

　　In summary, Humic acid It boasts remarkable effects such as drought resistance and moisture conservation, soil loosening, elevation of soil temperature, improvement of soil pH, and stimulation of crop growth. It has thus garnered significant attention from agricultural authorities and experts in the agricultural sector, been recognized as a green organic fertilizer source, and won widespread acclaim among farmers.

CCTV.com reports: Against the backdrop of comprehensively advancing rural revitalization and accelerating agricultural modernization, agricultural scientific and technological innovation has become a key driving force for green agriculture. Leveraging the research platforms of Shandong Agricultural University, Shandong Nongda Fertilizer Technology Co., Ltd. has successfully developed a new functional foliar fertilizer called “Nongda Leaf Power.” Field trial data confirm that this product significantly enhances crop photosynthetic efficiency and improves fruit quality, offering a fresh solution for boosting agricultural productivity and quality.

2026-04-28

The postdoctoral proposal defense at Nongda Fertilizer Industry marks the beginning of a new chapter in agricultural research.

On April 21, the review meeting for the postdoctoral proposal defenses of Dr. Li Pei and Dr. Cong Ping was held at the Agricultural University Fertilizer Company. Distinguished experts—including Academician Xu Minggang from Shanxi Agricultural University, Professors Zhang Min and Wan Yongshan, Dean Zhu Ge Yuping from Shandong Agricultural University, and Minister Gao Xia of the Soil and Fertilizer Department at the Shandong Provincial Agricultural Technology Extension Center—gathered to jointly embark on a new chapter in agricultural research.

2026-04-28

The Fertilizer Branch of the China Agricultural University Alumni Association hosted a “Symposium on High-Quality Development of China’s Fertilizer Industry” in Sanya, jointly charting a new roadmap for industry transformation and talent cultivation.

On December 6–7, the Fertilizer Branch of the China Agricultural University Alumni Association hosted the “Symposium on High-Quality Development of China’s Fertilizer Industry” in Yazu, Sanya.

2026-02-03

Nongda Technology has become the first company from Shandong Province to list on the Beijing Stock Exchange in 2026.

Taian City has consistently regarded promoting corporate IPOs as a key lever in building a strong, new‑type industrial city, and has innovatively established working mechanisms such as leadership‑assigned oversight for listed companies, empowerment task forces, one‑stop service via a single official letter, and direct communication channels between disciplinary inspection authorities and enterprises.

2026-02-03

Shandong’s first IPO of the year! Shandong Agricultural University Technology listed on the Beijing Stock Exchange.

On January 28, Shandong Agricultural University Fertilizer Technology Co., Ltd. was listed on the Beijing Stock Exchange, becoming the first company in Shandong Province to debut on the A-share market this year.

2024-09-14

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What exactly are the effects of humic acid?

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