Humic acid is formed by decomposition of plant residues. It exists in a wide range and has an astonishing total amount. It is calculated by hundreds of millions of tons. As organic material, it is widely used in agriculture, forestry, animal husbandry, petroleum, chemical industry, building materials, medicine, health, environmental protection and other fields. Humic acid is a kind of macromolecule substance. There are a certain number of free radicals in the molecule and it has physiological activity.
The function of humic acid:
1. Improvement of soil structure.
It can increase the content of humic acid in soil, become a bonding agent for the formation of soil aggregate structure, improve the organic or inorganic composite degree of soil, increase the water-stable aggregates with large particle size, and improve the soil structure.
2. It has the function of absorbing water and storing water.
Humic acid is an organic macromolecule colloid, which has strong water absorption and storage function. The water absorption of clay particles is generally 50% - 60%, while that of humic acids can reach 500% - 600%.
3. It can stimulate crop root growth and increase root water absorption capacity.
It can stimulate the growth and development of crops, increase root length, root quantity and root activity, and enhance the ability of root system to absorb nutrients and water.
4. Improving crop stress resistance.
It can enhance the activity of enzymes in soil and plant, regulate the physiological and metabolic functions of crops, and enhance the adaptability of crops to adverse environmental conditions.
5. Reducing the Evaporation and Loss of Water in Leaves.
Spraying humic acid liquid fertilizer on the leaf can reduce stomatal opening and close stomatal opening of wheat, and also provide nutrients for wheat.
Efficiency of humic acid fertilizer:
The humic acid fertilizer made from humic acid combined with nitrogen, phosphorus, potassium and other elements has the functions of increasing fertilizer efficiency, improving soil, stimulating crop growth and improving the quality of agricultural products. Nitrohumic acid can be used as an acid regulator for rice seedling raising.
Humic acid can promote growth by increasing sugar content and chlorophyll content in leaves, and indirectly improve the disease resistance of crops. Some studies have shown that sodium humate can inhibit sporangium germination of downy mildew, and its combination with other pesticides can significantly reduce the occurrence of downy mildew. At the same time, humic acids can also enhance the control of root-knot nematodes. Humic acid is widely used in pesticide additives because of its special structure and function.
Production process of humic acid fertilizer:
The production process of humic acid fertilizer belongs to the organic fertilizer production line
. The technological process of raw materials is generally divided into fermentation area, crushing area and granulation area. Humic acid compound fertilizer is a kind of compound fertilizer production line. It is made into granular fertilizer by mixing humic acid with other kinds of mono-element fertilizers or organic fertilizers. Humic acid exists in peat, lignite and weathered coal. It has to be purified through a certain procedure. After the batching system
according to a certain proportion of raw materials, it is crushed and mixed by fertilizer crusher
and fertilizer mixer
, and finally granulated.
Attention: Because humic acid is insoluble in water, lignite and weathered coal should be ammoniated with ammonium bicarbonate or ammonium sulfate to form water-soluble ammonium humate and then mixed with other inorganic fertilizers.