Management of celery after planting in greenhouse

The seedling stage of celery in greenhouse is longer, which usually takes 2-3 months. It can be planted when the seedlings grow to 10 cm high and 7 to 8 true leaves.

Before planting, 6000 kg of high-quality organic fertilizer and 50 kg of diammonium phosphate were applied per mu in the protected land, and a flat bed with a width of 1.3m was made by deep digging fine rake, with a row spacing of 25cm and a plant spacing of 20cm. The seedling bed was watered the day before planting. Planting had better be carried out on a cloudy day or in the evening, select a strong seedling with soil, while planting while watering, on the greenhouse film in time, greenhouse pay attention to ventilation, strictly prevent baking seedlings.

If there is a storm and sunny day and shade in time for 2-3 days after planting, the seedlings should be preserved and watered for 2-3 times. After slow seedling, deep ploughing and proper squatting seedling. When the lowest temperature dropped to 5 ℃, the temperature should be kept warm at night, and the temperature and humidity should be lowered during the day to prevent overgrowth and disease of the plant. the temperature was kept at about 20 ℃ ~ 25 ℃ in the daytime and 10 ℃ at night. In the middle of November, grass curtains should be added to keep warm, and the air should be released for more than 2 hours every day. On cloudy days, attention should be paid to letting out wind and dampness, and the time of letting out should be shortened. When the plant grows to 25-30 cm high, it can be fertilized once, 20 kg urea per mu, and then watered. After the plant into the peak period of human growth, can not lack of water, about 7-10 days watering, water dressing once, watering is generally carried out in the morning on a sunny day. At the same time, if the greenhouse is sealed and warmed up, the ground temperature can rise rapidly and let out the wind and dehumidify at noon. In the period of vigorous growth of celery, water deficiency, nitrogen deficiency or low temperature can easily lead to petiole hollowness, boron deficiency is prone to stem cleft, calcium deficiency may lead to black heart disease and so on. Therefore, topdressing should be timely watered, heat preservation and more organic fertilizer should be applied to ensure the supply of trace elements, and potassium dihydrogen phosphate or urea can be sprayed on the leaves in the middle and later stages of growth. Pay attention to the prevention and control of diseases and insect pests, leaf spot disease and spot blight can be sprayed with 75% chlorothalonil wettable powder 600x, cloudy days can be fumigated with chlorothalonil smoke, grey mold can be sprayed with carbendazim or mancozeb 800x, aphids can be sprayed with 1000 times of aphid spray.

When the plant grows to the standard height, it can be harvested, generally from late December to early February of the following year, the growth period can not be too long, too long will occur hollow, quality decline.

Wang Deming and Yang Defeng, vegetable Bureau, Xiajin County, Shandong Province