Humic acid is a black or brown amorphous polymer organic compound, which is insoluble in water, but has colloidal properties, which can improve soil structure and improve soil fertility. It has chelation and can increase the nutrient activity of phosphorus, potassium and trace elements. Fertilizer utilization; can also promote crop growth and improve crop stress resistance. In addition, humic acid also has a sustained release effect on elements such as NPK.

What is humic acid fertilizer?

Humic acid fertilizer is a general term for various humic acid-containing fertilizers. It is mainly made up of grass charcoal and lignite. It is made by a certain process, extracted, concentrated or turned into a water-soluble fertilizer containing nutrients. For example, it is rich. The humic acid raw material is added with sodium hydroxide to prepare sodium humate; the sulfuric acid is added to make humic acid;

The humic acid-containing raw material is added with nitric acid to prepare nitrohumic acid; or potassium hydroxide is added to prepare potassium nitrohumate; or ammoniated to prepare ammonium humate; and when the compound fertilizer is produced, humic acid is added. Or add nutrient elements and humic acid to produce humic acid compound fertilizer when producing basic fertilizer.

Application methods and standards for humic acid fertilizers?

Currently, humic acid fertilizers are still under development, and their product quality inspections are mostly industry and local standards, and application methods vary from product to product.

The national industrial technical standard ZBG21005-87 of sodium humate stipulates that the humic acid content (dry basis) of the first, second and third products is not less than 70%, 55% and 40%, respectively, and the pH value is 8.0-9.0, respectively. 9.0 to 11.0, 9.0 to 11.0, and the water insoluble content (dry basis) is not more than 10%, 20%, and 25%, respectively.

The application method is mainly after pouring into a solution, seed dressing and foliar fertilizer.

Among them, the compound is formulated into a base fertilizer with a concentration of 0.05% to 0.1%, and 200-250 kilograms per mu, preferably mixed with farmyard manure; for applying 150-200 kilograms of topdressing fertilizer, applying or pouring the crop root along with water. The concentration of soaking or foliar application before planting is 0.05%-0.5%, the soaking time is generally 5-10 hours, and the rice and cotton are 24 hours; the foliar spraying should be carried out after flowering to the early stage of filling, a total of 2~ 3 times.

Ammonium humate according to the industry standard HG1-1143-78 of the Ministry of Chemical Industry, the water-soluble humic acid content (dry basis) of the first and second products are not less than 35% and 25%, respectively, and the content of available nitrogen (dry basis) ) not less than 4% and 3% respectively. The application method and dosage are the same as that of ammonium humate, and it is especially suitable for saline-alkali soil, earthworm, sandy soil and viscous clay.

The humic acid-containing water-soluble fertilizer is a liquid or solid fertilizer prepared by adding an appropriate amount of NPK or trace elements to humic acid.

The technical standards of the industry (NY1106-2006) stipulate that the humic acid content of type I and type II solid products containing a large amount of element humic acid fertilizer is not less than 3% and 4%, respectively, and the total content of NPK nutrients is not lower than respectively. 35% and 20%; the humic acid content of liquid products is not less than 30g/L and 40g/L, respectively, and the total content of NPK nutrients is not less than 350g/L and 200g/L, respectively.

The content of humic acid and trace elements in the trace element type humic acid-containing fertilizer is not less than 3% and 6%, respectively. The content of water-insoluble matter is low, and the content of solid and liquid products should not be higher than 5.0% and 50g/L, respectively.

In the application method, the water-soluble solid or liquid product is mainly used as a foliar fertilizer, a seed fertilizer or a seed soaking, and a root soaking. The specific method can refer to the product specification, and it is generally diluted about 800 times. A large amount of elemental humic acid-containing water-soluble fertilizer can also be used for base fertilizer or top dressing, but due to the high cost and limited application amount, it should be applied in combination with farmyard manure and conventional chemical fertilizer. (Wang Xingren)

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