Summer cultivation techniques of Chinese cabbage
Due to the short growth period, compact plant type, heat resistance and disease resistance, the Chinese cabbage has different characteristics in terms of variety selection, sowing date, planting density, fertilizer and water management, and autumn and winter Chinese cabbage.
1, variety selection. Chinese cabbage cultivated in summer must be resistant to heat and disease. The main production used in the current production is Xiayang, a hybrid generation introduced in Japan. Domestically, there are varieties such as “Resistant to Heat White 45 Daysâ€, “Qingxia No. 3†and “Zhaoshu No. 7â€.
2, sowing. The best sowing date in Hebei is mid-to-late June. Suitable sowing time can be selected according to local climatic conditions and previous planting experience. Choose high terrain, convenient irrigation and drainage, loose and fertile soil, and rich in organic matter. Generally, the ridge is broadcast live, the ridge distance is 50 cm, the plant spacing is 40 cm and 50 cm, and the planting is reasonable, with 3000-3300 plants per mu.
3. Field management. After sowing for 3-5 days, the seedlings can be released. After planting, the plants are often inspected. When underground pests such as tigers are found, they should be sprayed with enemy killings and other chemicals to ensure seedlings. When the seedlings grow 2 true leaves, the seedlings should be planted once, 2 plants per hole, and 6-8 pieces of true leaves are selected to keep the seedlings. Summer cabbage should be applied to the base fertilizer, and then combined with watering in the critical period to apply fertilizer. Do not apply too much, try to reduce the loss of roots and leaves. Watering should be carried out in the evening. It should be filled with water ditch. Do not flood the surface with water. Otherwise, it will be prone to disease.
4. Pest control
(1) Soft rot: soak seeds with 0.3% potassium permanganate. First, soak the seeds in cold water for 1 hour, take them out and put them in the liquid for 30 minutes, rinse them with water, germination and sowing; or use 50 grams of Fengling for seed dressing, soak the seeds and add the medicine to mix and sow.
(2) Black rot: It can be soaked in 50-degree warm water for 20-30 minutes or soaked with streptomycin 1000 times for 2 hours, dried and then sown.
(3) Downy mildew: seed dressing with 25% metalaxyl or 70% mancozeb with a seed amount of 0.3%-0.4%, or soaking in 50-degree warm water for 30 minutes, cooling and drying.
(4) Pests: Aphids, often check the back of the plant, and find in time to kill with anti-Suiwei, Diguo and other pesticides. Green worms and diamondback moths are sprayed with high-efficiency pesticides such as pyrethroids and rapeseeds when they are found to be harmful.
5. Harvest. Summer cabbage is perishable and should be harvested in time. Stop watering 3-5 days before harvest to facilitate storage.
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