Humic Acids Function to Crops
Humic acid product/
humic acid is an organic substance with an amorphous network structure formed by the decomposition and transformation of animal and plant remains and residues through microbial processes, mainly carbon, hydrogen and oxygen. , nitrogen and sulfur, with molecular weights ranging from a few hundred to tens of thousands, or even millions.
It is believed that humic acid is more likely to exist in the supramolecular state in the soil. Humic acid has high physicochemical activity, physiological activity and optical activity, which further determine the multifunctional application of humic acid in the field of plant protection.
- Stimulating physiological metabolism Humic acid contains a variety of active functional genes, which can enhance the activity of catalase and polyphenol oxidase in crops, humic acid repairs soil, increases stress resistance, stimulates growth, improves fertilizer efficiency, optimizes farmland, and quality. Improvement has a good effect to stimulate physiological metabolism and promote growth and development. For example, humic acid can promote early germination of seeds, and the emergence rate is high, especially at low temperature; it can stimulate the division and growth of root meristem cells, so that the roots of seedlings are fast, the roots are more, the roots are increased, and the roots are elongated. To increase the ability of crops to absorb water and nutrients. Therefore, the nutrient supply is sufficient, the crop stems are fast and robust, the foliage is flourishing, the photosynthesis is enhanced, the nutrient is accelerated to the fruiting body, and the fruit is prematurely colored and matured.
Second, increase the plant’s resistance to humic acid products / humic acid / . humic acid can increase plant drought resistance, cold resistance, salt and alkali resistance and resistance to pests and diseases, etc., which is closely related to plant protection work is against plant resistance The improvement of pest and disease ability is mainly achieved by humic acid affecting the growth of plants. Plant growth will improve its own immune resistance, which is the internal basis of plant disease resistance. Humic acid can reduce plant leaves. The opening strength of the pores reduces the transpiration of the leaves, thereby reducing the amount of water, improving the water condition of the plants, ensuring the normal growth and development of the crops under drought conditions, and enhancing the drought resistance. The humic acid is mostly amphoteric colloid, with large surface activity and fungi. It has inhibitory effect, can enhance crop cold, easy to be adsorbed by cell membrane, change cell membrane permeability, promote absorption of inorganic nutrients, prevent rot disease, root rot and reduce pests and diseases. Humic acid itself has a similar hormone effect on plants, or Directly absorbed by plant cells affects plant growth, on the one hand can affect plant growth by affecting cell membrane activity To improve the ability of plants to resist pests and diseases. Studies have shown that humic acid with a lower molecular weight (LMS<3500Da) can directly enter the protoplast through the cell membrane, and the humic acid with a larger molecular weight (HMS>3500Da) cannot pass through the cell membrane, but It affects the properties of cell membranes and thus affects the absorption of nutrients. However, humic acid may also have a negative impact on plants. For example, when the concentration is high, the growth of plants is inhibited, and the sensitivity of plant roots to pathogens is increased. Therefore, do not add them during use. Large dose, normal use as recommended!
Third, change the characteristics of chemical fertilizer Humic acid contains carboxyl, phenolic hydroxyl and other functional groups, has a strong ion exchange and adsorption capacity, can make ammonium bicarbonate reduce the loss of ammonium nitrogen, improve the utilization of nitrogen fertilizer. The oxidatively degraded nitro-humic acid can inhibit the activity of urease and reduce the volatilization of urea. The degraded nitro-humic acid increases the distance of phosphorus movement in the soil, inhibits the fixation of water-soluble phosphorus in the soil, converts the available phosphorus into delayed-effect phosphorus, and promotes the absorption of phosphorus by the roots. The humic acid functional group can absorb and store potassium ions, so that the potassium fertilizer slowly decomposes, and the potassium is brightened to increase the content of available potassium. Humic acid and insoluble trace elements can undergo a kneading reaction to form a humic acid trace element chelate which is well soluble and can be absorbed by crops, thereby facilitating the absorption of trace elements by roots and leaves.
- Improved soil structure Humic acid can promote the formation of soil aggregate structure, regulate soil pH, regulate soil water, fertilizer, gas and heat, increase soil exchange capacity, achieve acid-base balance, improve soil water retention and fertility, and promote soil. The activity of microorganisms increases the number of aerobic bacteria, actinomycetes, and cellulolytic bacteria, accelerates the decomposition and conversion of organic substances, promotes the release of nutrients, and facilitates the absorption of nutrients by crops.
V. Improving fruit quality Humic acid products/humic acid/”>humic acid can form complexes or chelates with trace elements, increase the amount of trace elements from root to leaf or other parts, and regulate macro and trace elements. The ratio and balance of the enzymes strengthen the synthesis of sugar, starch, protein, fat and various vitamins. It can promote the activity of enzymes, convert polysaccharides into soluble monosaccharides, and increase the synthesis and accumulation of starch, protein and fatty substances. Accelerate the metabolism of the primary products from the stems or leaves to think about state affairs, seeds, and make the fruit full and thick.
- Optimizing farmland ecosystem Humic acid can affect farmland ecosystems in many ways. On the one hand, it can optimize the physical and chemical properties of soil, regulate soil pH and ionic environment. Humic acid promotes the formation of larger particle size agglomerates and microaggregates in the soil through flocculation and sol, and improves soil structural properties. At the same time, humic acid itself has weak acidity, which can regulate the pH of the soil and adsorb soil anions. On the other hand, humic acid positively affects soil microbes, and studies have shown that humic acid can significantly increase soil microbial activity.
At present, the application forms of humic acid in agriculture include humic acid fertilizer, pesticide, mulch film, soil conditioner, drought-resistant agent and humic acid seedling substrate. Among them, the most closely combined with plant protection is humic acid fertilizer. It has the function of controlling pests and diseases while stimulating the regulation of crop growth.