Because soil-borne pathogens exist in the soil, two control methods, namely, irrigation with roots and soil mixing, are generally selected.
Root treatment
Root irrigation is to apply the pesticide solution to the soil surface or shallow layer, and to reach a certain depth of the soil layer through leakage to exert its effect. There is a certain limit to the depth and amount of chemicals that can reach the soil during the irrigation treatment. In addition, root irrigation is generally on the side of the root base, which cannot effectively protect the root comprehensively. Due to the existence of the root concentration gradient, the depth of the potency of the agent is most needed, and the amount of the agent is small. The surface layer, which plays a secondary role in disease control, has a large amount of the agent, and the surface layer will also have a deposit of the agent, making the drug effect impossible. Play effectively.
Mixing treatment
Medicine mixing is to mix pesticides and soil uniformly at a certain ratio for sowing or planting, and has the following characteristics:
First, pesticides are evenly dispersed in the soil, which can achieve the effect of local soil disinfection, kill pathogenic bacteria in the soil around the roots of plants, and protect the root system. In addition, the medicine is dispersed in the soil with tiny particles, slowly dissolved and released to the surroundings, and the plant is continuously protected for a long time. This is not available in soil disinfection.
Second, the effect of seed treatment can also be achieved by mixing the medicine. After the seed germinates, the medicine will be absorbed and protect the seedlings. However, the seed treatment agent has a limited amount of attachment. If the amount of the medicine used is too large, it will easily damage the seedlings. The medicine mixed with the particles is distributed in a large space around the seeds.
Third, the tiny particles of the soil-mixing agent are evenly distributed in the soil around the roots of the plant, which can provide more comprehensive protection to various parts of the roots of the seedlings after seed germination, which is also beyond the treatment of seeds.
Contrast conclusion
In order to achieve the same control effect, the two soil treatment methods must have the same concentration of the agent at a vertical depth (the pathogen distribution is concentrated). Compared with root irrigation, soil mixing has the following advantages:
â‘ For soil application, because there is no concentration gradient, the dosage will be much less than that of root irrigation. If the soil is thick and the pathogen is concentrated in a deeper soil layer, the root irrigation application may not reach the soil layer. The effect of soil application is obviously better than that of root irrigation;
â‘¡ Soil mixing can provide more comprehensive protection of crop roots and effectively reduce disease occurrence;
â‘¢ The application of soil mixing effectively reduced the damage caused by excessive local pesticide concentrations to seedlings;
â‘£ The soil mixing agent is evenly dispersed in the soil, and effectively reduces the deposition of the root irrigation agent on the soil surface, and the utilization rate of the pesticide is higher than that of the irrigation root application.
Therefore, to prevent soil-borne diseases, soil mixing is more scientific than root irrigation.
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