How many days does the onion ripen?

The maturity of onion is about 330 days. Onions, also known as onion heads, are sown in early September of the first year and harvested in early June of the second year.

Onion is a biennial or perennial herb. Root string, dark green cylindrical hollow leaves with waxy surface; The leaf sheath is thick and scaly, and it is dense around the shortened stem to form a bulb (commonly known as onion); An umbrella with small white flowers.

The radicle of onion will shrink soon after being buried, so there is no main root. Its root is a string-shaped fibrous root, which is inserted at the base of the shortened stem disk. The root system is weak and hairless. The root system is mainly distributed in the top soil of 20cm, so it has weak drought tolerance and weak ability to absorb fertilizer and water.

Extended data:

Onions are very adaptable to temperature. Seeds and bulbs germinate slowly at 3 ~ 5℃ and begin to accelerate at 65438 02℃. The suitable temperature for seedling raising is 12 ~ 20℃, the leaf is 18 ~ 20℃, and the bulb is 20 ~ 26℃. Strong seedlings can tolerate the low temperature of ~ 6 ~ 7℃.

Bulbs need higher temperature to expand, and bulbs can't expand below 15℃. The optimum growth temperature is 2 1 ~ 27℃. If the temperature is too high, it will grow and decline and enter dormancy.

Onion needs more than 14 hours of long sunshine during bulb expansion and bolting. Under the condition of high temperature and short sunshine, only leaves grow and onions cannot form.