Greenhouse celery has a longer seedling period and generally takes 2 to 3 months. When the seedling grows to 10 cm high and 7-8 true leaves, it can be colonized.
Before the planting, the soil was applied with 6000 kg of high-quality organic fertilizer and 50 kg of diammonium phosphate. The deep excavation was made into a flat raft with a width of 1.3 m, the planting distance was 25 cm, and the plant spacing was 20 cm. The nursery was watered one day before planting. The colonization is best carried out in cloudy or evening, and the selected seedlings are planted with soil mites, while planting and watering, timely shed film, greenhouse ventilation, and strict prevention of baking.
After planting, if it is cloudy, it will be shaded for 2 to 3 days at noon. After planting, it should be kept to relieve the seedlings, and it can be watered for 2 to 3 times. After slow seedlings, deep tillage is appropriate for seedlings. When the minimum temperature drops to 5 °C, pay attention to heat preservation at night, and cool down and damp during the day to prevent the plants from growing and getting sick. The daytime temperature is kept at 20 °C ~ 25 °C and 10 °C at night. In the middle of November, the straw curtain should be covered with heat preservation. The wind should be released for more than 2 hours every day. On cloudy days, pay attention to the wind and humidity, and the air release time should be shortened. When the plant grows to a height of 25 to 30 cm, it can be fertilized once, and 20 kg of urea is applied per mu, and then water is poured. After the plant enters a vigorous growth period, it is not necessary to lack water. It should be poured in about 7 to 10 days, and the water should be topdressed once. The watering is usually carried out in the sunny morning. At the same time, the greenhouse is sealed and heated up, so that the ground temperature will rise rapidly and the wind will be drained at noon. The lack of water, nitrogen deficiency or low temperature during the vigorous growth of celery tends to cause hollow petiole, and boron deficiency is prone to stem fissure, and calcium deficiency may cause black heart disease. Therefore, watering, topdressing, heat preservation and organic fertilizer should be applied in time to ensure the supply of trace elements. In the middle and late growth stages, potassium dihydrogen phosphate or urea solution can be sprayed on the foliage. Pay attention to the prevention and control of pests and diseases, leaf spot and spot blotch can be sprayed with 75% chlorothalonil WP 600 times solution, cloudy day with chlorothalonil aerosol smoke; gray mold with carbendazim or mancozeb 800 times Liquid spray control; aphids can be sprayed with 1000 times liquid spray.
When the plant grows to the standard height, it can be harvested. Generally, it is not too long in the growing season from late December to early February. If it is too long, it will be hollow and the quality will decline.
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