Detailed Explanation of Key Points for Winter Chinese Cabbage Cultivation Techniques

1. Land preparation and sowing, rational crop rotation, timely removal of residues from the previous crop, early plowing and sun-bleaching, cleaning the field, deep plowing, watering to preserve soil moisture, and applying sufficient base fertilizer (apply 4000-5000 kg of high-quality decomposed organic fertilizer, 25 kg of diammonium phosphate, and 20 kg of potassium chloride per mu); after mixing seeds with New High Lipid Film, sow at the appropriate time. Sowing should be done in appropriate amounts, and a tooth harrow should be used to lightly rake the surface soil so that the seeds are sown into the soil.

2. Seedling stage management. For uniform emergence, thinning and replanting should be carried out at the cotyledon stage, the cross stage, and the 3-4 leaf stage. After thinning and replanting, water and topdress promptly (pay attention to the nitrogen fertilizer content) to prevent wilting caused by disturbance of the seedling root system. Timely spraying of 800-fold New High Lipid Film solution can effectively prevent pathogen infection, improve resistance to natural disasters, increase photosynthetic intensity, and promote healthy seedling growth.

3. Transplanting and planting. Before transplanting, the field should be thoroughly watered and sufficient base fertilizer should be applied (1000 kg of decomposed pig and cattle manure per mu, paying attention to balancing nitrogen, phosphorus, and potassium elements in the soil). Transplant at the appropriate time, with rational close planting, water immediately after planting, and promptly spray 800-fold New High Lipid Film solution (to effectively prevent evaporation of aboveground moisture and transpiration of seedling moisture, shorten the seedling recovery period, and help seedlings quickly adapt to the new environment). Afterward, water once each morning and evening every day for 3-4 consecutive days.

4. Field management. After the seedling recovery period ends, timely intertillage to preserve soil moisture, watering and topdressing should be carried out (apply 15-20 kg of compound fertilizer per mu; during the rosette stage, 15-20 kg of urea and 10-15 kg of calcium superphosphate can be applied per mu), along with spraying 800-fold New High Lipid Film solution to improve fertilizer use efficiency; spraying Zhuangjingling during the rosette stage of Chinese cabbage can make the plant stems thick and strong, the leaves thick and plump, the leaf color fresh and tender, and the plant lush, with a rich natural taste. At the same time, it can enhance disaster resistance, reduce the amount of pesticides and chemical fertilizers, and lower residual toxicity.

5. Disease control: The 3 major diseases of Chinese cabbage are downy mildew, soft rot, and viral disease. Chinese cabbage soft rot, commonly known as "rotten lump" and "rot disease," can be controlled by spraying streptomycin sulfate or agricultural streptomycin + 800-fold New High Lipid Film solution; viral disease is mainly transmitted by aphids, and as long as aphids are well controlled, the disease can be effectively prevented and controlled. It can be controlled by spraying Yashijing + 800-fold New High Lipid Film solution. For those already infected and beginning to show symptoms, promptly pull out and destroy diseased plants to control the source of disease; for healthy plants, spray with 500-700-fold 20% Virus A solution, once every 5-7 days, for 2-3 consecutive times; downy mildew is an airborne disease, and its occurrence and spread require relatively high humidity. Therefore, the key to controlling this disease is humidity control. In the early stage of the disease, remove diseased leaves and central diseased plants, and promptly spray with 68% Jinlei, 72% Kelu wettable powder, 52.5% Yikuaijing, or 40% phosethyl Al wettable powder + 800-fold New High Lipid Film solution, spraying before the disease occurs or in the early stage of the disease, once every 10 days, for 2-3 consecutive times. Liu Yajuan