1. Variety selection
Choose varieties with tall and erect plants, compact leaf clusters, large leaves, solid, sweet quality, less fiber, strong stress resistance, wide adaptability, and late bolting in early spring, such as Jinnan Shiqin and Xiqin No. 1 etc.
2. Nursery and transplant
Celery is mostly transplanted by raising seedlings, which can be sown from early to mid-October. The calendar seedling age of celery in the greenhouse in winter and spring is 60 to 70 days.
1. Ground preparation
Make a flat border of 1.0 to 1.2m wide, and the border surface should be flat. The day before planting, the seedbed was filled with foot water, and after the water penetrated, a layer of fine soil was sprinkled on the surface of the seedbed. Spread evenly on the seedling bed with fine sandy soil and seed j. Cover the seedling with a thickness of 0.5cm and cover with a layer of film. When the seedlings reach 60%, the film will be removed.
2. Seedling management
Cultivation and weeding are timely after emergence, and the temperature is maintained at 15-20aC, which is suitable after emergence! Temperature, no higher than 20C during the day and no lower than 8°C at night. Spring seedlings should be raised to prevent vernalization during the seedling period, and the night temperature must be controlled above 8°C to prevent freezing damage. Before planting, ventilate seedlings should be strengthened around the day and the night temperature should be gradually reduced to about 0℃ to improve the adaptability after planting.
Three, colonization
The seedling grows 4-6 true leaves, the plant height is 15-20cm, and the seedling age is 60-70 days old. 5-7 days before planting, choose strong seedlings with thick leaves and well-developed roots for transplantation, and transplant them on a sunny morning. Plant spacing is 8~10cm, row spacing is 18~20cm, planting 30,000~32,000 plants per mu, the depth of planting should not bury the core leaves, should be shallow rather than deep, and water the planting water after planting.
Fourth, management after planting
1. Slow seedling management
During the slow seedling period, fertilizer and water should be properly controlled, and seedlings should be squatted to promote the differentiation of hair roots and leaves. After planting, attack the fertilizer and water to promote growth.
2. Fertilizer and water management
After 7~8 leaves are produced, it enters the vigorous growth stage. At this time, the fertilizer and water should be increased, and urea or compound fertilizer 10~15kg per mu should be applied once every 15~20 days.
3. Humidity and light control
Before mid-May, cover with grass thatch for heat preservation at night and increase ventilation during the day. Increase the amount of ventilation in late May. During this period, there will be a lot of rain. It is necessary to dredge the field drainage channels in time to prevent lotus root water from entering the shed and causing rotten seedlings.
5. Harvesting and post-harvest management
About 15 days before harvest, spray 50~100mg/L gibberellin (920) once, and spray 0.3% urea and 1% brown sugar at the same time to improve the quality. Celery should be harvested in time. Harvesting too early will affect yield. The nutrient of the petiole harvested too late will transfer to the root, which will make the petiole texture thicker, increase the fiber, and even appear hollow, which will reduce the quality of the petiole and affect the yield. Generally, the plant height is about 70cm, and the single plant weighs 1kg at one time.
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