High-yield cultivation techniques of spring-tolerant pakchoi

Chunyue is a new cultivar resistant to breeding selected by Nanjing Vegetable Seed Station. It is suitable for overwintering or spring cultivation. It will be supplied to the market in the absence of spring from mid-February to early May.

The sowing period in the middle and lower reaches of the Yangtze River is from February 10 to 25, and the autumn sowing is from September 20 to October 5. Small arch sheds are required for spring sowing and seedlings, and the supply period is from early April to early May. Seedlings are sown in autumn, and the supply period is from mid-February to late March.

Cultivate strong seedlings, plow the sunburn, apply 2000 kg per acre of cooked manure, and prepare a 1.5-meter-wide seedbed. Use 700 grams of seed per acre of seedbed, the ratio of seedbed to field is 1:10. After emergence, dilute manure water is applied 2 to 3 times to promote seedling growth.

Site preparation and early plowing and plowing hoeing, 50 kg of compound fertilizer per acre of base fertilizer, and ridge preparation with a width of 2 meters. Vegetable seedlings were planted at 4-5 leaf stage and 30 days of seedling age. Spring planting row spacing is 22 cm, plant spacing is 18 cm, autumn planting row spacing is 25 cm, plant spacing is 20 cm. It should be planted shallowly in spring so as to slow down seedlings and plants; it should be planted deep in autumn to reduce freezing damage.

After field planting, the spring planting of field-planted live trees was topdressed 2 or 3 times, applying 5 kg of urea per acre each time, and spreading while raining. Watering in dry weather, clearing ditch when raining. The rearing of autumn sowing depends on the weather conditions and the management of vegetable seedling growth. If the temperature is high and the vegetable seedlings are large, the amount of watering should be controlled to slow down the growth rate; if the temperature is low and the vegetable seedlings are small, it should be covered with straw to prevent cold and keep warm. In winter, it is appropriate to maintain the condition to reduce frost damage. After planting live trees, fertilize once, apply 5 kg of urea per acre, and spread it in the rain; after the spring, the plants are planted and weeded once before the line is sealed, and at the same time, 10 kg of urea are applied per ditch.

Prevention and control of pests and diseases In early spring, attention should be paid to the control of diamondback moth, and in late autumn, attention should be paid to the control of aphids and pupae. Use 5% card dead grams of 2000-3000 times solution or 5% acetaminophen 2000-3000 times solution spray to control vegetable maggots, use 311 diamond moth enemy 600-1000 times solution or 5% wicked 2000 times solution spray to control vegetable worms and vegetables Moths were sprayed with 3000% solution of 10% imidacloprid to control aphids. Diseases are mainly soft rot and downy mildew. Prevention of downy mildew by spraying 72% DuPont Kerou 600-800 times liquid or 55% cream to 800-1000 times liquid spray; use 72% agricultural streptomycin 4000 times liquid or 50% sterilin 1000 times liquid spray to prevent soft rot disease.

Harvested in time for autumn sowing in mid-February to late March, spring sowing in early April to early May, yield per mu of 2500 ~ 3000 kg.

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