1. Rotations with non-solanum and leguminous crops are carried out for 3-5 years. 2. Seedlings Cultivate disease-free strong seedlings in disease-free fields or in disease-free soil. 3. Field management of acidic soil, can be sprinkled with a small amount of lime during fertilization, adjust the pH to slightly alkaline to inhibit the growth of bacteria, appropriate control of irrigation, timely drainage after rain, reduce soil moisture, increase phosphorus and potassium fertilizer, improve plant Disease resistance. Field operation, pay attention to less damage to the root system. 4. High-temperature stuffy shed summer 7-8 months free time, in the greenhouse in the ground, the application of lime nitrogen 70 kg per mu, application of 200 grams of deep-plow soil conditioner, improve soil structure, promote root development. After ridging, cover the mulch to close the greenhouse again, and use sunlight to increase the temperature inside the protected area. After 15-20 days, the ground temperature above 20 cm can reach above 45°C, eliminating most harmful germs. 5. Supplemental nutrition Spraying plant growth regulators once every 10 to 20 days—naturally available Suofeng 481—promotes photosynthesis and improves vegetative growth. 6. For the prevention and treatment of serious nematodes on nematode nematodes, nematicides should be used to prevent nematodes from biting the roots. 7. Chemicals prevention and treatment In the early stage of disease, 100-200ppm agricultural streptomycin poison, or 50% enemy-dry double 500-1000 times liquid, or agricultural anti-"401" 500 times liquid, 0.25-0.5 kg per plant, 10-15 days irrigation Once, it can be 2-3 times with irrigation. 3L-size Carrot,3L-size Red Color Carrot,Big Size Carrot,3L-size Premium Carrots Yirun Agricultural Cooperative , https://www.yiruncn.com