How do microbial agents promote root growth?

Microbial agent has its unique characteristics, because it is a living agent, and its main function depends on the life activities of a large number of beneficial microorganisms contained in it. It is only when these beneficial microorganisms are in vigorous reproduction and metabolism that they convert certain substances into substances that are absorbed and utilized by crops.

Hello, I am a student of the Biological Olympiad, and recently I happened to talk about the symbiosis of this mycorrhizal fungus is usually accompanied by the production of beneficial bacteria, which can prevent the invasion of pathogenic bacteria, because these beneficial bacteria occupy a favorable ecological position near the root circle, so they block the proliferation of pathogenic bacteria. The secretion of fungal hyphae improves the soil structure by agglomerating soil particles, and when the fungal hyphae decompose, the organic matter produced is conducive to the survival of decomposing bacteria in the soil, so that the composition of microorganisms in the whole soil reaches a dynamic equilibrium. However, in harsh soil conditions, perhaps the most important function of mycorrhizal fungi is to improve soil structure.

The main function of mycorrhizae is to enhance the ability of plants to absorb nutrients, especially phosphorus fertilizers, because phosphorus itself is insoluble, often fixed in the soil, is a less mobile ion, when the phosphorus around the root system is exhausted, that is, nutrient deficiency occurs, and the mycelium produced by mycorrhizae can stretch beyond this area, and then use the phosphorus that could not be absorbed, but many scholars have also found that the development of mycorrhizae is suppressed in the state of soil nutrients. There are many theories that can be used to explain how it works, which may be carried out by the regulation of phosphorus concentration, which also promotes water absorption and evapotranspiration. It has also been suggested that mycelium may have increased the absorption area of plant roots. In addition, it has also been reported that mycorrhizae may produce growth regulators in plants, which alter the physiology of plants themselves, plant hormones are produced at the growth points of plants, and mycorrhizae can increase the number of growth points in plants, and these plant hormones can also have an effect on the conduction function of plant stomata, thus affecting the water movement in plants. When fungi help plants, they can also obtain carbohydrates and amino acids needed for growth from plants, and the good symbiotic relationship promotes the rapid expansion of mycorrhizal bacteria, which in turn increases the ability of plants to resist adversity, forming a complementary and inseparable subtle relationship between fungi and plants in nature.

Hope it helps.

<> microbial agent has a rooting effect. The principle of promoting rooting: after the microbial agent is applied to the soil, the microorganisms will begin to multiply, and in the process of reproduction, it will secrete a variety of substances (such as the enzyme of Chitin), when these substances accumulate, it will improve the soil air raid environment and promote the rooting of the plant.