Autumn delayed cultivation of celery is an open field nursery. Seedling age 50 to 60 days, with 4 to 5 true leaves, 15 to 20 cm in height, well-developed root system, suitable for age seedlings. Seedlings are planted in early August and planted in late September. Or sowing in the middle and late August, planting in early October, harvesting before and after the Spring Festival. In order to cultivate strong seedlings, the following should be noted: (1) Nursery preparation: The celery seed is small, the top soil ability is weak, and the emergence is slow. The proper breeding ground should be selected and the fine soil preparation should be used. The celery nursery should choose a slightly higher, loose soil, can irrigation and drainage, fertile sandy soil land for breeding seedlings. Each mus applied 5,000 kg of cooked circumferential fertilizer, deep-turning, smashing, making a width of 1.2 to 1.5 meters and a length of about 20 meters. When you do the hoe, remove some of the adobe soil and screen it for covering the soil. After the fine leveling, use 48% trifluralin to spray 60 to 100 kg of water on the surface of the mussels, immediately scratch 5 to 10 cm deep, and mix the medicine with the topsoil to prevent trifluralin photolysis. Trifluralin weeding effect 2 to 3 months. (2) Immersion seed germination and sowing: Soaking seed germination 7 to 10 days before sowing. The seeds were soaked in fresh water for 24 hours. The seeds were rubbed and rinsed until the water was clear. The seeds were then removed and left to dry on the straw mats to disperse the excess water on the surface. After drying, the seeds were placed in pots and pots, covered with wet cloth, and placed at 15-20°C to germinate. During the germination, the seeds were turned once a day with water to make the temperature and humidity uniform. The seeds were washed with water every 2 days to prevent mildew. About 7 days or so, 80% of seeds can be sown when exposed. Immerse the seed with 11% thiourea for 10 minutes. After washing the liquid, soak it in clean water and germinate again. The result is good. Bottom water before sowing, with water to smooth the surface with a rake. The germination seeds were slightly dried and then mixed with a small amount of fine soil, and the seeds were sown evenly after the infiltration of water. After the broadcast, cover soil 0.5-1.0 cm. The seeding volume per acre seedling field is 1 to 1.5 kg, and the cultivated seedlings can be planted with 3 to 4 mu. (3) Management after sowing: After sowing, use straw or remove the leaves of the straw to cover the seedlings. The best cover is not to directly contact the surface of the seedlings. The role of the covering is to cool the shade and prevent the rain from directly slamming the surface when it rains. When the drought is not raining during the emergence period, it should be poured with water and keep the surface wet. After the emergence, the grass curtains will be opened every morning and evening so that the seedlings will see the light, and when the weather is hot at noon, the grass curtains will be covered with shade. As the seedlings grow up, the shading time is getting shorter and shorter every day. After 10 days, the curtains can no longer be covered. After the seedlings are used, the wheat straw is removed and the straw is removed every 2 to 3 days. The batch is withdrawn in 3 to 4 batches. If no herbicide was applied before sowing, after sowing the soil, spray 25% of herbicidal ether 200 times onto the surface of the loquat, and use 70 to 100 kg per acre. After the first true leaf was unfolded, the first seedling was planted, and the seedling distance was about 1.5 cm. The second time the true leaves were planted for the second time, the seedlings were 3 cm apart. Simultaneously pay attention to weeding. Pay attention to watering this time and keep the surface wet. When the seedlings are 4 to 5 leaves, apply 10-15 kg of ammonium sulfate per acre and water them, and then reduce the number of watering. Pay attention to pest control during the nursery. When there is a locust harm, use dimethoate control. Chlorothalon can prevent and control bacterial leaf blight or spot disease. Food & Feed additive,High Quality Food & Feed additive,Food & Feed additive Details, CN Xi'an JCF Herb Technology Development Co., Ltd , https://www.jcfherb.com