1. Direct stimulation of plant physiological processes
Root development promotion
Through the secretion of gibberellic acid, cytokinin and auxin-like substances, the tillering and extension of the root system are accelerated, the water and fertilizer absorption capacity of the plant is enhanced, and the stem thickness and leaf area are increased. Experimental data show that its treatment can significantly improve the crop seedling survival rate.
Nutrient metabolism optimization
Secrete degradation enzymes such as protease and cellulase to convert insoluble organic matter in the soil into absorbable forms, improve the utilization rate of nitrogen, phosphorus and other elements by plants, shorten the maturity cycle and increase yield.
2. Soil microenvironment reconstruction
Soil structure improvement
Secrete extracellular polysaccharides to promote soil aggregate formation, enhance water and fertilizer retention capacity, reduce the damage of saline-alkali soil osmotic pressure to the root system, and decompose pesticide residues and heavy metal pollutants.
Microbial community regulation
Through competition for nutrients and spatial sites, the reproduction of pathogens (such as wilt pathogens and root rot pathogens) is inhibited, and the incidence of soil-borne diseases is reduced. Its rapid colonization in the rhizosphere can form a protective barrier to hinder pathogen infection.
3. Strengthening stress resistance
Biological stress defense
Induce plant systemic resistance, activate defense enzymes (such as POD, SOD), enhance immune response to diseases; secrete antimicrobial peptides (such as gramicidin) to directly dissolve pathogen cell walls.
Abiotic stress relief
Improve the absorption barriers of elements such as potassium and phosphorus in saline-alkali land, regulate soil pH, and alleviate the physiological damage to plants caused by drought, high temperature and other adversities.
4. Application benefit verification
In field trials of crops such as cucumbers and tomatoes, Bacillus licheniformis treatment can increase yield by 10%-20%, while reducing the use of chemical fertilizers by 20%-30%. Its biofertilizer compounded with carriers such as potassium humate can significantly improve the problem of dead seedlings and rotten roots caused by continuous cropping obstacles.
In summary, Bacillus licheniformis achieves the simultaneous improvement of plant growth efficiency and stress resistance through the triple synergistic effects of "growth promotion-bacteriostasis-soil improvement".