Leek is also called four seasons pie, leek. The main commodities are lotus leaves and fake stems. The product is fresh and tender with special flavor. They are often used as seasoning, and many people must have eaten them. The leaf shell of shallot is gray-white, tubular, hollow, thin at the top, about 40 cm long and 6 mm in diameter, and has strong tillering ability. There is a small amount of cultivation in the provinces south of the Yangtze River. Plastic greenhouses can be planted all year round except in summer. If you want to grow onions, you must master this technical point.

Leek likes the cold climate and can grow all year round, but it is not heat-resistant and can't tolerate early. Mainly planted in spring and autumn. In variety selection, we should choose varieties with strong adaptability, cold resistance and heat resistance. At present, the excellent varieties of shallot mainly include shallot, Rick, Anhui shallot, Lhasa Long Wave, Qingdao School and so on.

Generally, onions are cold-resistant vegetables and can withstand high temperatures. The suitable growth temperature is 15-25℃. When selecting plots, we should choose plots with sufficient water, rich organic matter and convenient drainage. Apply base fertilizer first, and apply decomposed chicken manure 1000 kg or decomposed organic fertilizer 3000 kg per mu. After uniform spraying, it is 1.5 m long and 8- 10 m high in summer and low-lying areas, and there are drains everywhere. Open land is planted in spring and autumn, and protected land can be planted all year round except summer. According to the different characteristics of flowering and fruiting, the propagation methods are also different. According to this feature, shallots can be divided into flowering seedless shallots, flowering seedless shallots and flowering seedless shallots.

Chives can achieve annual growth and annual supply in warm areas, and can be picked and sold at any time according to the needs of the mayor/market. The climate is cool in spring and autumn, and the quality and yield are the best. The main feature of onion is that divers have strong urban ability and begin to tiller immediately after busy farming. The normally growing shallots can form 20 tillers every year, and the tillers are related to the fertilizer level and temperature. In spring, the temperature is high, there is plenty of water, fertile soil and plenty of water. Bonsai has many leaves and high yield. However, because there are too many bonsai, they are crowded with each other, which inhibits the growth of the ground and underground. The best solution is to dig out the plants and replant them.

In terms of water management, the soil should be kept moist before and after tillering, and the water should be adjusted at seedling stage 1-3. In order to promote the growth of root system, after loosening the soil for 1-2 times, water it every 7- 10 days. The transplanting time is about 40-50 days after sowing, when transplanting 3-4 plants, the row spacing is 12-20cm, the total distance is 8- 10cm, the planting is shallow, 4-6cm is appropriate, and water should be done in time. Due to the shallow roots of shallots, the absorption capacity is reduced, and there is no resistance to thick fertilizer, so it is necessary to frequently water small water and often apply light fertilizer, with 5-8 kg of dilute manure or elements and 4-5 kg of potassium chloride per mu. Fertilize every 12- 15 days to keep the soil moist. Apply urea 15 kg 20 days before harvest. Pay attention to good drainage, and harvest in succession within 30 days after transplanting. Varieties with more starch can soften the soil.