Onion likes cold climate. When can I plant it?

Onions can be sown in spring and autumn, usually harvested in March-April and June-July in spring, sown in September-65438+1October in autumn and harvested in April-May of the following year. Onion grows fast, has strong adaptability and strong vitality. In different parts of the country, because of the different climate, there may indeed be different planting time periods. Especially with the improvement of planting technology, such as greenhouse vegetables, as long as the crops are provided with appropriate moisture, temperature and sunshine.

Row spacing and plant spacing are larger, while leek is smaller. Generally, onion row spacing is 23 cm, hole spacing is 20 cm, and 2 ~ 3 tillers are planted in each hole, and the planting depth is 4 ~ 5 cm. The row spacing of leeks is 10 cm, and the hole spacing is 8 cm. Two or three shallots are planted in each hole, which is usually planted in March-April and harvested in June-July. It can also be sown in September ~10 and harvested in April ~ May of the following year. During this period, immature seedlings are supplied to the market and young leaves are mainly eaten. We usually plant onions on May 20th. First, we sprinkle fermented and decomposed farmyard manure on the ground, and then level it. Use a plug to dig off the onions that have grown over the years. Cut off the multiple roots of onion seeds. Dig out furrows according to the size of onion seeds.

The growth period of spring sowing green onions can reach 16 months, while the growth period of autumn sowing green onions in the first year and autumn harvesting in the second year in northern China can reach 22 months, which is close to the life cycle of two years! The sowing date must be strictly controlled in autumn, neither too early nor too late. If the sowing date is too early, the seedlings will grow too big before winter. If the seedlings are too big in winter, the plants in winter will spring easily at low temperature.

Judging from the properties of green onion, it must be a drought-tolerant and cold-resistant variety. 1 point shows that the transplanting time in northwest Gansu is at the end of June of the lunar calendar, so from the time of the solar calendar, that is, from the end of July to the beginning of August, green onions have a wide adaptability to temperature, which is not only resistant to high temperature, but also safer to overwinter in low temperature environment. Green onions, regardless of size, can be harvested and sold at any time, and growers can plant green onions all year round.