How to plant green onions well?

Onion is one of the onion vegetables, which has high yield, easy cultivation, less pests and diseases and is resistant to storage and transportation. It is a very popular vegetable and an important condiment, which not only sells well all over the country, but also can be exported in large quantities to earn foreign exchange. First, the seeds of the sown Chinese onion are small, the seed coat is firm and thick, the cotyledons are unearthed, the seedlings grow slowly and the seedling stage is long. In order to shorten the occupation time and facilitate management, seedlings were transplanted. Seedbeds should not be replanted. After the previous crop is harvested, it should be deeply ploughed and fertilized, and generally made into a high border with a width of1.4m.. The seedbed should be carefully arranged, the bed surface should be soaked with water before sowing, and new seeds should be used for sowing. The seed dosage per mu is 75-100g. After sowing, cover 2 cm with soil, and then cover with straw or film to increase temperature and moisture and speed up seedling emergence. 2. Seedling management is generally 6-8 days after sowing. When the seedlings grow completely, the mulch is removed. At seedling stage, the plant growth is small and the leaf transpiration is small. After emergence to the third leaf stage, fertilizer and water should be controlled to make the root system develop healthily. At the seedling stage, interplant 1-2 times, remove the over-dense weak seedlings, plant spacing of 7- 10 cm, and pull out weeds. Third, the planting of green onions is generally from early June to high temperature in summer (early July). When the onion seedlings grow to 30-40 cm high and the transverse diameter is 1- 1.5 cm, they are suitable for transplanting. Before transplanting, the seedbed should seep 1-2 times, and seedlings should be selected and graded when raising seedlings. Remove dead leaves and seedlings damaged by diseases and insect pests, select stout, non-forked seedlings and plant them respectively according to the seedling size, with the planting density of 100- 120 cm and the plant spacing of 2.5-3 cm. The number of seedlings is 22,000. The depth of planting should be exposed to the heart. IV. Field Management After planting in summer, the physiological functions of aboveground parts and roots are weakened and the growth is slow. At this time, if it is not too dry, it is not advisable to water it more. Drain water after rain to prevent waterlogging, so as not to cause rotten roots, yellow leaves and dead seedlings. It is necessary to cultivate, loosen soil and weed for many times to promote root development. Autumn is the peak growth period of onion leaves and green onions, so it is necessary to water, topdress and cultivate the soil in time to promote the rapid growth of green onions. Water Qin Ying, keep the onion field moist all the time, and stop watering before harvest 1 week. In order to grow and soften green onions, topdressing and ridging should be done 3-4 times in August-September. Topdressing is mainly based on nitrogen fertilizer, with appropriate application of calcium superphosphate and plant ash, generally every 15 days 1 time. Apply urea 10- 15 kg and calcium superphosphate 15 kg per mu. In the morning, after the dew is dry, soil should be cultivated, but the soil is still cold, and soil should be cultivated every half month 1 time. Finally, it is cultivated into a high ridge, and the onion heart leaves are not buried every time the soil is cultivated. The main diseases of scallion are purple spot and downy mildew, and the main pests are scallion thrips and scallion flies, so it is necessary to control them in time after occurrence. 5. When harvesting the green onions, one side of the green onion ridge can be dug deep with four teeth or shovels to expose the green onions, and the green onion plants can be pulled out with a gentle pull. Don't yank when harvesting, so as not to damage the false stems, break the stems or roots, and reduce the quality of commercial onions. Shake the green onions after harvest, spread them in the ground, combine every two rows of green onions into 1 row, and dry them in the ground for 2-3 days. When the leaves are soft and the fibrous roots and onion surfaces are half dry, the dead leaves are removed, and each bundle is 7- 10 kg. Don't pile it up casually to prevent it from being heated and rotted. When harvesting green onions, you should also avoid the frost in the morning and wait until the temperature rises during the day and the green onions thaw.