Celery has strong stress resistance and high yield, which is very suitable for plastic solar greenhouse production. According to the production experience, the following measures were taken to improve the celery yield in plastic solar greenhouse. Soil preparation and fertilization. After the greenhouse is completed, 5Oo-6,000 kg of high-quality farm manure, 5 o kg of calcium superphosphate and 25 kg of ammonium bicarbonate are evenly applied to the surface, then ploughed until the depth is about 30 cm, and finally the land is made into a flat border of 1.5- 1.8 m..

Select high-yield and high-quality varieties. In greenhouse production, Italian celery or American celery with high yield can be planted, and green celery and glass chips with stalks can also be planted. The productivity of different varieties varies greatly, some varieties yield only 3OOO kilograms per mu, while the yield of high-yield varieties can reach 85 ooo kilograms per mu.

Suitable for live broadcast. Celery is generally cultivated by transplanting seedlings, but according to the production experience, direct seeding has more advantages when celery is produced in plastic solar greenhouse, mainly because it does not hurt the root system and has no seedling extension. Developed root system, strong absorption capacity and full utilization of fertilizer and water are conducive to vigorous growth of aboveground parts and increase production. Generally, the seeds should be sown in lO-l5 days after the shed is closed, and the seeds should be soaked before sowing. When the soil moisture is good, the seeds should be sown lightly, and when the soil moisture is poor, the seeds should be sown deeply to facilitate the whole seedling.

Growth period management. It mainly includes celery growth period management and environmental management.

Growth period management: When celery seedlings grow to three true leaves, the seedlings should be raised evenly at the interval of l3 cm. Timely intertillage weeding. When five real leaves grow, start watering and keep the ground moist all the time. Petiole length is about 10 cm, and topdressing is started, and ammonium bicarbonate is about 0/0 kg per mu/kloc, and petiole length is about 25 cm per mu 15 kg ammonium bicarbonate. Water it in time after each topdressing, so as to facilitate the absorption and utilization of fertilizer by plants and promote growth. When the petiole grows to about 40 cm, harvest it in time.

Environmental management: At the initial stage of sowing, due to the high outdoor temperature, it is necessary to strengthen ventilation, and the temperature should be controlled between 18-20℃. After entering l2, the outside temperature becomes cold, so we can cover the film early to raise the temperature in the greenhouse and keep it at about 20 degrees Celsius. Celery is a wet-loving crop, so it is necessary to keep the ground wet frequently when cultivating. Celery is not strict about light. Proper weak light is beneficial to the growth of celery, and the illumination time is 6-9 hours a day.

The petiole of celery has strong regeneration ability. Use harvesting or cutting to increase yield. Each plant can harvest 3-4 leaves at a time. Fertilize and water in time after harvest. When harvesting, the stubble is 3-15cm. After mowing, apply 2000-3000 kilograms of high-quality farmyard manure per mu and water it in time.