(1) stubble arrangement ① onion. Transplanting from October of the previous year to February of the following year/kloc-0, and harvesting from early April to mid-late May. In order to go on the market early, plastic film mulching cultivation can be implemented.
Crouching onions. In summer, sunshade nets can be used for cultivation or intercropping among tall crops to supply the summer market.
3 autumn onions. Generally, it is transplanted from the beginning of August to the middle of 65438+ 10, and it is listed from the middle and late of 65438+ 10 to the beginning of the following year. When the autumn onion is transplanted, the temperature is high, so you can sprinkle some wheat straw between rows to cool down and moisturize.
Four winter onions. Onion production is generally carried out in protected areas with good thermal insulation performance. (2) Variety Selection There are two kinds of leeks widely used in production: Siji and Liuzhou. The four-season onion plant is erect, with a plant height of 30-40cm, a length of 6-8cm, a thickness of 0.6cm, a plant weight of 3-4g, green leaves, less wax powder, strong tillering ability, fast growth, poor flowering and strong fragrance. Liuzhou onion has strong tillering ability, dense cluster, plant height of 45 ~ 50 cm, onion length 10 cm, onion thickness 1 cm, plant weight of 4 ~ 5 g, leaf surface covered with wax powder, strong adaptability, fast growth, fruitless flowering, and slightly lighter fragrance than four-season onion. (3) The seedlings of Chinese chives can blossom but not bear fruit, and the seedlings are generally raised by dividing plants in production. Nursery requires fertile soil and convenient irrigation and drainage. At seedling stage, water and fertilizer management should be strengthened, pests and diseases should be prevented in time, and plants can be transplanted separately when they are lush. (4) Land preparation, land preparation: select plots with flat terrain, good irrigation and drainage conditions and fertile soil, and arrange vegetables such as soybeans and corn for stubble. After the previous crop is harvested, the dead leaves are removed, 3500-4000 kilograms of decomposed organic fertilizer and 35-40 kilograms of special fertilizer for vegetables are applied every 667 meters, evenly spread on the ground, then deeply ploughed, finely raked and leveled, and then the border is made. The boundary is 1.2 ~ 1.5m wide, and a drainage ditch with a width of 40cm and a depth of 20cm is dug between the boundaries. Part of the soil in the ditch is made into a ridge with a height of 15cm, and the rest is paved on the boundary. (5) Transplanting leeks by ramets. Before planting, dig out the mother plant, cut off the long roots and break the plant by hand. Broken plants should have stems and roots. The row spacing of transplanted plants is12 ~13cm×13 ~15cm. Transplanting in spring and autumn can be appropriately sparse, with 2 ~ 3 plants per hole and planting depth of 3 ~ 4 cm. After planting, water in time to facilitate the delay of seedlings. There is also the practice of watering first and then inserting onion seedlings. (6) Fertilizer and water management is not competitive with weeds because of the shallow root distribution, weak absorption capacity, intolerance to centralized fertilization and drought. Therefore, it is necessary to use less water to irrigate water and fertilizer management and keep the soil moist. The best watering method is sprinkler irrigation, watering once every 7 days, topdressing every 667 m2 10% decomposed dilute manure water or 0.5% urea dilute fertilizer water, and the dosage is 1000 ~ 1500 kg. After leek survives, it begins to tiller, and secondary tillers can be produced on the tiller. At this time, more fertilizer is needed. Generally, 5 ~ 8 kg of urea and 4 ~ 5 kg of potassium chloride are topdressing on 667 m2. 15 ~ 20 days before harvest, increase the amount of fertilization, topdressing urea 15 kg every 667 meters, and spraying biological fertilizers such as Bao and amino acid fertilizers on the leaves at the same time to promote the plants to turn green. Generally, it can be harvested 2 ~ 3 months after planting.