Onion is old, and there is an oval grape-shaped thing on it, which contains many small particles. After a while, the small particles inside will gradually turn black, that is, the seeds of onions, which can be used to grow onions.

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1, iron-core onion, its remarkable characteristics are: onion is long, onion is 55 ~ 65 cm long and its diameter is 3.5 ~ 4.5 cm. Steel onion has the characteristics of long onion (40cm long), solid porcelain, sweet and crisp, full of spicy taste and good taste. It sells well and does not deteriorate after long-distance transportation.

2. The growth environment of Allium coreanum has strong cold resistance, fast growth rate, dense tissue, lodging resistance, strong disease resistance and wide adaptability. The growth period is 120 ~ 150 days, which is most suitable for planting in spring and autumn. In the process of planting, green onions are mainly done by sowing and cutting.

3. Core scallion should be topdressing by stages on the basis of applying sufficient base fertilizer. After beginning of autumn, when the plants grow faster, foliar fertilizer should be applied topdressing to promote leaf growth. After Bailuyuan Festival, it entered the peak growth period of Welsh onion, which is the key period for the formation of Welsh onion yield. It should be carried out simultaneously with water topdressing, watering after shallow intertillage and spraying foliar fertilizer to improve the utilization rate of effective components in fertilization.

4. In addition to nitrogen, phosphorus and potassium, calcium, magnesium, boron and manganese also have certain effects on the growth of green onions. Under the condition that the three elements meet the supply, the effect of adding calcium, manganese and boron is the most obvious, which shows that the green onion is long and thick and has high yield.