Celery can be planted all year round, but how do you grow celery in summer and autumn? Let's take a look at the pollution-free planting techniques of summer and autumn celery. Planting time According to local climatic conditions and consumption habits, heat-resistant and heat-resistant varieties are selected. The summer celery can be sown at an average daily temperature of about 15 °C. The middle and lower reaches of the Yangtze River are generally in the middle to late March to May, mostly live broadcast, and can also be transplanted. Autumn celery is transplanted from late May to August. 2. Cultivate seedlings 1 seedbed preparation Choose the oysters with high dryness, rich in organic matter, fertile and convenient irrigation and drainage. After the potatoes are deep-turned, they are dried for 3~5 days, and fully fermented organic fertilizer is applied. 0.5kg of calcium phosphate is applied per square meter of seedbed, and the plant ash is 1.5. ~2.5 kg, 耙平åšç•¦. 2 germination sowing Soak the seeds in cool water for 24 hours before sowing for 24 hours, wash off the mucus, dry the seeds to a semi-dry, wrap them in a damp cloth, place them in a cool, ventilated place or water tank or hang them in the well from the water surface 30 Promote germination at ~40 cm, keep the temperature at 15~20 °C, turn it 1~2 times a day, and wash it once with cold water. It can be sown when the seeds are germinated for 5-7 days. It can also be soaked in 5 mg/kg of gibberellic acid for 12 hours. The seeds can also be soaked and taken out, placed in a 15~18 °C incubator, and after 12 hours, the temperature is raised to 22~25 °C. After 12 hours, the temperature is lowered to 15~18 °C for 3 days. The seeds can be germinated. Choose cloudy or evening sowing, soak the water in the seedbed before sowing, evenly sow the seeds, cover the soil 0.5~1 cm thick. 3 seedling management After sowing, use 25% herbicide ether wettable powder 0.5 kg, and water 75~100 kg, and spray evenly on the seedbed surface. After sowing, cover the straw, straw and other shading and cooling measures. You can also put a bracket from the ground 1~1.5 meters, covered with shading material, and can be mixed with cabbage to keep the surface moist, and water in the morning and evening. After heavy rain or hot rain, the well water can be cooled down, seeded with germinated seeds, and emerged 2 to 5 days after sowing. When the seedlings are arched, it is necessary to gently pour water once, and the seedlings will be released after 1~2 days. After the emergence of the seedlings, gradually remove the cover in the evening and cover with a layer of fine soil, and water the cover before peeling off the cover. The first true leaf should be poured in small water before the first leaf is unfolded. When the first true leaf is unfolded, try to keep the soil moist, but not too much water. The seedlings are 1-2 times, and the weak seedlings and weeds are removed. 2~3 pieces of true leaves, watering should be seen dry and wet, with watering topdressing 1~2 times, about 10 kg of ammonium sulfate per acre, 4~5 true leaves can be planted. 3. Timely colonization Before planting, the foreground is deep after the harvest, and the sun is dried for 3 to 5 days. The high-quality organic fertilizer is 5000 kilograms per mu (1 mu = 667 m 2 ). In the north, flat rafts are used, and in the south, sorghum is used, and the width varies from 1 to 1.7 meters. Seedling age 50~60 days, choose cloudy or cloudy weather, plant watering before planting, and take the main root about 4 cm when cutting. The spacing of the celery plant is 10 cm X 15 cm, and each plant has two plants; the celery plant has a row spacing of 27 cm X 40 cm, and each plant has a single plant. It is advisable to bury the rhizome when planting, and do not bury the soil in the heart. 4. Field management 1 Summer cultivation should pay attention to the management of fertilizer and water, and the whole growth period should be attacked by fertilizer and water. Otherwise, it is easy to drought and lack of fertilizer, affecting the growth and development of celery, and increasing the fiber to reduce the quality. Water is poured every 2~3 days during drought. Watering should be carried out in the morning and evening, keeping the soil moist, promoting the vigorous growth of celery, and reducing the temperature of the ground, resulting in a microclimate that is conducive to the growth of celery. In case of heavy rain, it should be drained and flooded in time. In case of hot rain, the cold well water should be poured in time to cool down and increase the oxygen content in the water to prevent the hot roots from suffocating the roots of the plants. The whole growth period should be followed up in time. Topdressing should master the principle of a small number of times, once every 10~15 days, each time applying urea or compound fertilizer 10~12 kilograms per acre, it can be applied with water until 15~20 days before harvest. Celery grows to avoid using manure and other farmyard manure, otherwise it will cause heartburn or rotten roots. In the early stage of growth, it can be cultivated 1 or 2 times. It is advisable to cultivate the roots or stems and leaves. In combination with cultivating, weeding should be carried out in time, so that the grass should not be crushed. One month before harvesting, gibberellic acid with a concentration of 20-50 mg/kg can be sprayed every 7~10 days to increase the plant height and increase the yield. 2 After the cultivation in autumn, the water is poured once every 2~3 days in the initial stage of slow seedling to keep the soil moist to reduce the temperature of the ground to promote the slow seedling. After celery is slowed down, it begins to grow slowly. In order to promote the occurrence of new roots and new leaves, the watering should be properly controlled for seedlings, seedlings for 5-7 days, no watering or less watering, keeping the soil surface dry and 10 cm underground. Wet and vigorously supply water and fertilizer in the vigorous growth period. Immediately after the end of the seedlings, the compound fertilizer will be applied with water, 10~15 kg per mu. After every 10 days, 10 kg of urea or compound fertilizer will be applied per acre, and a total of 4 times of topdressing will be applied. Stopped 20 days before harvest. Water is poured once every 3~4 days, water is poured once every 5~7 days, and water is stopped 5~7 days before harvesting, so that the soil is kept moist. 5. Softening cultivation It is mostly carried out in the autumn, and it should be planted when planting, and the plant spacing (5~7) cm X (30~40) cm. The key point is that the soiling time should be appropriate. Generally, the average monthly temperature drops to about l0 °C. When the plant height is about 25 cm, the soil is selected for sunny days, and the water should be continuously poured three times before the soil is cultivated. Boil the soil once every 2~3 days, and pour 4~5 times together. The thickness of the soil is 17~20 cm. It is not suitable to cover the heart. 6. Major pest control It is necessary to pay attention to the timely prevention and control of celery spot blight (late blight), celery leaf spot (early blight), celery virus disease, celery soft rot and cockroaches. 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