The difference between iron onion and steel onion is 1, and the characteristics are different: iron onion is characterized by its long length, generally 55 to 65 cm, and its diameter is 3.5 to 4.5 cm. Steel onion has the characteristics of long onion, solid porcelain, sweet and crisp, full of spicy taste and good taste. Moreover, it has the characteristics of good appearance and no deterioration after long-distance transportation, and it is more expensive than iron onion. 2. Different growing environments: iron-core scallion has strong cold resistance and fast growth rate; Onion tissue is dense and lodging-resistant; Thick wax powder, strong disease resistance and wide adaptability. The growth environment of steel onion is harsh, and it is usually sown in the autumn of the first year and overwinters with seedlings; Transplanting in the summer of the following year and harvesting green onions in the early winter.

Iron-core Welsh onion is a hybrid combination of a typical plant selected and purified from Japanese Welsh onion and Zhangqiu Welsh onion stable male sterile line. The growth period of hard-core scallion is about 120- 150 days, depending on the planting environment, region and other factors. Generally, in the early stage of its growth, the growth rate is relatively slow, and it takes about 90- 120 days to enter the pseudostem expansion stage. It only takes about 30 days in the later period.

Hard-core onion king has strong heat and cold resistance, moderate sweetness and spicy taste, which is suitable for planting in the north of the Yangtze River. When planted in the open field in spring and autumn, the suitable temperature for seed germination is 13-30℃. Morphological characteristics: Qiza 1, No.2 and No.6 are new onion varieties bred by crossing 100% male sterile lines.

Efficacy and function of scallion

1, root

The root is white and string-shaped, and the lateral roots are few and short. The number, length and thickness of roots increase with the total number of leaves. In the vigorous growth period, the number of green onions can reach more than 100.

Step 2 stop

The stems are extremely short, spherical or oblate, solitary or clustered, with a thickness of 1~2cm, white skin, membranous and unbroken. Multilayer tubular leaf sheaths are attached to the upper part, and fibrous roots are densely distributed in the lower part. When the growth point of the seedling tip differentiates into flower buds, a flower stem will gradually develop. Welsh onion stems are stout, hollow and unbranched, 30 ~ 50 cm long.

Step 3 leave

Leaves consist of leaf body and leaf sheath. The leaves are long and conical, hollow, green or dark green. The monocotyledonous sheath is cylindrical. Multilayer nested leaf sheaths and 4-6 unsheathed young leaves wrapped in them form rod-shaped pseudostems.

4. flowers

Before flowering, the growing umbel is embedded in the involucre. Onion plants with fully developed vegetative organs have 400-500 flowers in an inflorescence, many of which can reach more than 800. Bisexual flowers, cross pollination. Each flower has 6 perianth and 6 stamens. When the pistil is mature, the style length is 65438 0 cm. Ovary superior, 3-loculed, 2 capsules per locule.