Celery is very cold-tolerant, especially in the seedling stage, and it can tolerate short-term low temperatures of -10°C. This feature allows the seedlings to spend the winter in the shed, after the spring, with the increase of temperature and then into normal growth.
l, appropriate sowing: overwintering celery in early August sowing is appropriate.
2. Soil preparation and fertilization: After harvesting the former crop, clean up the dead branches, defeat the leaves, and slake 5,000 kg of high-quality farmyard manure.
3, sowing: seeding after soaking the bottom, seed spread should be uniform, after sowing on its cover soil 0.5 ~ l. 0 cm thick.
4, seedling management: celery after the emergence of a high temperature season, and seedlings drought resistance is poor, should be timely replenishment, dilute shallow irrigation, keep the soil moist. When the seedlings grow to 2 to 3 true leaves, they are planted and the field weeds are removed. When 4 to 5 leaves are used, the root system is more developed and the absorption capacity is enhanced. The water can be properly controlled to keep the surface wet.
5. Winter Management: After entering mid-October, when the temperature drops, it can be watered once, and then the shed is baited. In the initial period of the shed, the amount of ventilation should be increased to prevent the temperature in the shed from getting too high. With the temperature decreasing, the ventilation is gradually reduced. When the outside temperature reached 6°C, the area around the shed was tightly closed and ventilation was stopped. Keep white in the shed at 18-20°C, and about 10°C at night. When the outside temperature drops to -5°C, the shed is covered with a two-layer membrane to prevent celery from freezing damage. In the event of a short-term heavy cooling, the grass curtains around the shed are protected from freezing.
6, after the winter management: After the beginning of spring with the rise in outside temperature, the temperature gradually increased inside the shed, then you have to remove the shed inside the second layer of film, so that the plant more see the sun, and often clean the dust on the shed, improve lighting conditions. When the local temperature is stable above 10°C, the topdressing and watering will be started. The first time the water volume should not be too large to prevent the petiole from cracking due to excessive water absorption. Water is sprayed once every 7 days or so to speed up the growth of plants and provide the market in the morning.
7. Harvesting: The higher the yield of wintering celery is, the later the harvest will be, but the harvesting will be too late, which will affect the cultivation or production of chilled vegetables. Therefore, it should be harvested once before the planting of fruit and vegetables, and the yield per mu can reach 3000. ~ 3500 kg.
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