The key factor that causes rot on the root of scallions is heavy sorghum. Due to continuous planting for many years, the number of pathogenic bacteria in the soil increases, and scallion roots are easily rotted. Remedy: Implement rim planting, usually three rotations. There are also three other diseases that can cause rot. The specifics can be seen in the following introduction.
One is that the roots are damaged. Solution: Before the planting, the onion shall be strictly graded and then treated with medicaments to eliminate the root rot and ensure the whole seedlings. Pharmaceutics selected targeted bactericides and new high-lipid membrane mixtures.
The second is herbicide harm. Solution: When weeding herbicides, new high-fat membranes are added. New high-fat membranes can be transformed into highly toxic pesticides. Poisoning pesticides are low-toxic, low-toxicity pesticides are micro-toxic, and the dosage per acre is reduced to improve the control effect.
The third is the accumulation of water. Onion leaves have low water transpiration, weak water absorption capacity in roots, less water consumption, and less moisture. If the water is flooded during the growing period, it will make the green onion fields accumulate disasters and produce roots, dry tips, yellow leaves and dead seedlings. Remedy: Prevent flooding, flooding, watering, and rooting when watering, promote root development, and increase root absorption of nutrients and moisture. Improve the ability to absorb water and fertilizer.
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