Delayed cultivation of celery in autumn to open field nursery. The seedling age is 50 to 60 days, with 4 to 5 true leaves, and the seedling height is 15 to 20 cm. The root system is developed, and the seedlings are suitable for age. Seedlings were planted in early August, planted in late September, and harvested in the new year. 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 matters should be noted: Co.,
1. Nursery preparation: The celery seeds are small, the top soil ability is weak, and the emergence is slow. The suitable nursery land should be selected and finely ground. For celery seedlings, it is advisable to choose a land with a slightly higher topography, loose soil, capable irrigation, and fertile sandy loam. Apply 5,000 kilograms of decomposed round fertilizer per acre, deep turn and flatten, and make a flat raft with a width of 1.2 to 1.5 meters and a length of about 20 meters. When doing the hoe, first take out some of the bauxite and sift it to cover the soil. After the whole level is flattened, use 48% trifluralin per acre to spray the surface of 60-100 kg of water, and immediately draw a depth of 5 to 10 cm to mix the medicine with the topsoil to prevent the photolysis of trifluralin. The effect of trifluralin is 2 to 3 months.
2, soaking seeds and germination and sowing: 7 to 10 days before sowing, soaking seeds and germination. Soak the seeds in water for 24 hours, then wash the seeds to the water, remove the seeds and dry them on the straw mats, etc., so that the seeds lose excess moisture on the surface. After drying, the seeds are placed in the tile basin, covered with a damp cloth, and placed at 15-20 °C for germination. During the germination, the seeds were turned once a day with water to make the temperature and humidity uniform. The seeds were washed once every 2 days with water to prevent mold. About 7 days, 80% of the seeds can be sown when they are white. Soak the seeds with 11% thiourea for 10 minutes, wash the liquid, soak in water, and then germination, the effect is better. Drain the bottom water before planting, and use water to wipe the surface with a pair of tweezers. The germination seeds are slightly dried and then mixed with a small amount of fine soil. After the water in the sputum is oozing, the seeds are evenly sprinkled. Cover the soil after the broadcast is 0.5 ~ 1.0 cm. The seeding amount per mu of seedlings is 1 to 1.5 kg, and the seedlings can be planted for 3 to 4 mu.
3, management after sowing: after sowing with straw curtains or remove the leaves of wheat straw covered on the nursery, the cover is best not to directly contact the surface, placed on the raft. The role of the cover is to shade and cool down, preventing raindrops from directly hitting the face when it rains. When there is no rain during the emergence period, it should be poured in small water to keep the surface moist. After the emergence of the seedlings, the straw curtains will be uncovered every morning and evening, so that the seedlings will see the light, and the straw curtains will be shaded when the weather is hot at noon. As the seedlings grow up, the shading time becomes shorter and shorter every day, and the curtains are no longer covered after more than 10 days. Use wheat straw to cover the surface of the clams horizontally, and remove some wheat straw every 2 to 3 days after the seedlings are removed, and remove them in 3 to 4 batches. If the herbicide is not applied before sowing, after sowing the soil, spray 25% of the herbicide ether 200 times to the surface, and use 70-100 kg of liquid per acre. After the first true leaf was unfolded, the first seedling was carried out, and the seedling distance was about 1.5 cm. The second seedling was carried out for the second true leaf, with a seedling distance of 3 cm. At the same time, we must pay attention to weeding. Pay attention to watering during this period and keep the surface moist. When the seedlings are 4 to 5 leaves, 10 to 15 kg of ammonium sulfate is applied per acre and watered, and then the number of watering is appropriately reduced.
Pay attention to the prevention and control of pests and diseases during nursery. Use a dimethoate control when there is a mites. Use chlorothalonil for prevention of spot blight or spot disease.
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