How to raise onions in autumn?

How do onions grow in autumn? What should I pay attention to? Please also have experience to help introduce onion has less investment, high yield, simple management, high efficiency characteristics, is an ideal vegetable variety for farmers to increase income, planting network sorted out the autumn onion seedling methods, the following detailed list for netizens reference. Step 1: Determine the sowing time of onion: Because the growth and development period of onion assimilation organs requires cool season, except for spring sowing and summer cultivation in northern alpine areas, other hot summer areas are sown in autumn, planted before winter or stored for winter, customized in spring, harvested in early summer or middle summer. Specific sowing date, due to the climate difference between north and south, sowing date gap is large. To the south of North China Plain, autumn sowing time is delayed more and more towards South Vietnam along with the geographical position moving southward. The central and southern parts of our province are generally suitable for sowing in the first and middle of September. Step 2: Selection of onion seeds: General selection of purple jade 1, purple jade 2, purple star and other purple varieties more. In addition, onion seeds have a short life span, so be sure to use new seeds of the year. Step 3: Seeding method: 1. Determine the planting area, which should be determined according to the seedbed density and actual seedling demand. Generally, fresh and plump seeds can be sown 4 kg-5 kg per mu, and 8~10 mu of seedlings can be planted for one mu. 2. Sowing and soil preparation. Sowing beds are generally selected from sections where the previous crop is not onion and garlic, and are loose and fertile for convenient irrigation. Flat beds or high beds can be used. About 10 days before sowing, the land will be deeply ploughed. Fully decomposed farm manure will be widely applied. About 2000 kg will be applied per mu, and about 15 kg compound or compound fertilizer (potassium sulfate for potassium fertilizer, not potassium chloride) will be added per mu. Undecomposed organic fertilizer should not be applied to avoid burning seedlings or insect pests. After fertilization, ploughing 2 - 3 times, the depth is 15 cm-20 cm, so that soil manure is fully mixed. After leveling the land, prepare the bed and prepare it for sowing. 3, onion seed soaking, germination before sowing (or not soaking, direct sowing), can be broadcast. the adjust nursery bed is re-arranged and raked, and is lightly step on by feet or pressed once by a bottom leveling farm tool to make that soil tightly combined, so as to prevent uneven bed surface after watering, and then watering, wherein the water depth is 5 cm to 7 cm, so as to ensure sufficient soil moisture. After the water infiltration, lightly sprinkle a thin layer of fine dry soil on the surface of the ridge to prevent seed rolling during sowing and to facilitate radicle penetration. Sprinkle the seeds evenly on the surface of the bed, cover with fine dry soil after sowing, about 1 cm-1.5 cm thick. Step 4. Onion seedling management method: Before emergence, keep the bed soil moist, and water it in time to prevent seedlings from dying due to lack of water. After the seedlings are out, irrigation should be properly controlled, squatting seedlings should be carried out to promote root growth and prevent excessive growth of the ground. Water control time is about 10 days. After that, according to weather conditions, water management should be based on the principle of seeing dry and wet. If the basal fertilizer is insufficient, the seedlings are yellow and thin, and can be combined with irrigation and topdressing. When the seedlings grow 2 true leaves, nitrogen fertilizer is applied in combination with watering, and 10 kg-15 kg urea is applied per mu. If the base fertilizer is sufficient, no topdressing is required. When the seedling height is 5~6cm, it is necessary to thin the seedlings and weed, keep the seedling spacing about 1.5~3cm square, and pay attention to the prevention and control of underground pests. Cultivation of moderate seedlings is the premise of high yield, onion is a green vernalization crop, the requirements for strong seedlings are different from other crops, the standard of moderate strong seedlings is: general plant grows to 3 - 4 leaves, plant height is about 25~30 cm, pseudostem diameter is 0.6 cm-0.7 cm (pseudostem diameter exceeds 0.9 cm, there is the possibility of early bolting), plant health, no diseases and insect pests, this kind of moderate strong seedlings. Click for more onion growing techniques Click for more vegetable growing techniques