9月20
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Fulvic acid – how much do you know?

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With the advancement of technology and economic development, people pay more and more attention to health issues, which also triggers people’s demand for green food. Rational application of fertilizer is an important part of the production of green food. The applied fertilizer must meet the requirements of green food production and will not have adverse consequences on the environment and crops. The “2014 Central Document No. 1” proposed a strategy to improve the national food security system and establish a long-term mechanism for sustainable agricultural development, which highlights the key to fertilizer in agricultural production. Nowadays, fulvic acid plays a more important role in agricultural production because of its small molecular weight, dense functional groups and strong physiological activity. It plays an increasingly important role in agricultural production.

Steady growth of humic substances
Humic acid plays a big role in various fields such as agriculture, industry, medical care, and environmental protection. It is the most research and development in the agricultural field. People recognized the soil from the nutritional perspective as early as the 19th century. The importance of humic acids to plant growth. In 1976, Lee et al. proposed that humic acid had the greatest stimulating effect on plant growth in soils with low organic matter content. In 1981, Rauthan et al. reported that fulvic acid promoted the growth of cucumber seedlings, the number of leaves per plant, and the number of flowers. Xu Xudan et al (1983, 1986) spraying fulvic acid on potted or field-grown wheat seedlings can increase yield by 7.3% to 18.0%, and can also reduce yields in drought conditions, reaching 97% of normal watering yield. In the 1970s, in order to solve the problem of insufficient total fertilizer production at that time, China began the project of comprehensive development and utilization of humic acid. Practice has proved that humic acid substances have a stimulating effect similar to hormones on the growth of many crops such as tomatoes, cotton and grapes.

With the continuous increase and deepening of research on humic substances in domestic academic circles, the State Economic Commission approved the establishment of the “China Humic Acid Industry Association” in 1987, responsible for unifying and coordinating the work of humic acid in the country. Nowadays, humic acid is attracting more and more attention as a soil improver with excellent performance. At the same time, humic acid has become a drought-resistant agent, foliar fertilizer, conditioner and compound product for agricultural applications. The main ingredient.

Humic acid and fulvic acid, who is “respect”?
The International Humic Acid Trade Association proposes that humic acid is a broad term commonly used in the business and academia to determine the classification of an individual compound. The humic acid can be extracted from natural humus in a variety of ways, usually by alkali dissolution. The substance precipitated by the acidified alkali solution is humic acid. Fulvic acid is a broad term commonly used in the business and academia to determine the classification of an individual compound, extracted from natural humus, a substance that is soluble in alkaline, acidic and aqueous solutions.

The Chinese Humic Acid Association proposed that humic acid is a mixture of macromolecular organic weak acids formed by a series of decompositions and transformations of animal and plant remains under the action of microorganisms and geophysical and chemical processes. The main components of humic acid are fulvic acid, brown humic acid, and black humic acid. Fulvic acid is a group of substances in humic acid which are soluble in both dilute alkali solution and acid and water. The molecular weight is small and yellow or brownish yellow.

Shenyang Agricultural University, National Standards Committee Humic Acid Working Group Leader Zou Deyi, the newly drafted national standard for comments (GB/T××-×× mineral source humic acid fertilizer, determination of fulvic acid carbon content) pointed out humic acid It is a group of humic acids which are only soluble in dilute alkali solution, insoluble in acid and water, and have a large molecular weight and black or brownish black with aromatic and aliphatic structural characteristics. Fulvic acid is a group of humic acids which are soluble in dilute alkali solution and soluble in acid and water. The molecular weight is small and the dilute solution is yellow or brownish yellow.

It can be seen from the above authoritative explanations that there is no definitive conclusion on the relationship between humic acid and fulvic acid.

The reserves of humic substances on the earth are huge and widely exist in soil, lakes, rivers and oceans. The molecular structure of humic acids does not have a well-defined chemical structure and conformational configuration. It has acidic, hydrophilic, cation exchange capacity and complexation. Not only does fulvic acid possess the general characteristics of humic acid, but it also has the characteristics that general humic acid does not possess. First, the yellow humic acid has a small molecular weight and is easily absorbed by plants; secondly, the fulvic acid functional group has a large content, which is larger than the physiological activity of the general humic acid, and has a relatively strong complexing ability to metal ions; Humic acid cannot be directly dissolved in water, and needs to be converted into a monovalent metal salt or an ammonium salt such as potassium or sodium to be dissolved in water. The aqueous solution of these salts is alkaline, and the fulvic acid is directly soluble in water, and the aqueous solution is acidic. These three characteristics make fulvic acid more useful in agriculture than humic acid, and the effect is better.

Blue out of blue, yellow humic acid out?
At present, weathered coal is the main raw material for extracting and producing humic acid fertilizers. However, it is not easy to produce soluble humic acid fertilizers with weathered coal. First, high-quality raw materials must be used. The humic acid content of raw materials must be higher than 40%. Calcium The magnesium ion content should be below 2%, and the extracted humic acid can only function in a soluble state, which increases the production cost of the humic acid fertilizer. Therefore, the raw materials of humic acid fertilizer are difficult to find, and the production cost is high, which has plagued many fertilizer producers.

The production of fulvic acid series fertilizer is an efficient way to turn waste into treasure, in line with the national energy conservation and emission reduction, green environmental protection policy and industrial policy. It has far-reaching effects on the adjustment of product structure of China’s current fertilizer enterprises, deepening organic agriculture and developing modern agriculture. Strategic significance, especially suitable for environmental governance, ecological agriculture construction, pollution-free agricultural production, green food and circular economy development needs. As a “newcomer” in the fertilizer industry, there are more and better uses for the humic acid fertilizer waiting for us to dig!

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