When do onions grow and plant?

Onions are planted in autumn. ? The planting method is soil selection, seed treatment, sowing and seedling raising.

Planting time

Onions are hardy crops and don't like excessive temperature. It can grow normally at 7-25℃. The general planting time is autumn. Because of the different climates in China, the planting time of onions is different. North China is generally sown after beginning of autumn, 1 1 at the beginning of the year or around Qingming, and harvested before wheat harvest. Sow in the middle and lower reaches of the Yangtze River in late September, 165438+ 10, and harvest in late May or early June of the following year.

The climate in the northeast of China is cold. Generally, after the ice and snow melt in spring, sowing begins when the temperature reaches above 5℃, and harvesting begins in autumn.

Planting method

1, soil selection

Onions have certain requirements on soil, and continuous cropping with other onions and garlic vegetables is prohibited. The best crops in the last crop are solanaceous fruits, melons and beans, so loose, fertile soil with good water retention should be chosen for planting.

2. Seed treatment

In order to facilitate the emergence of seedlings, seeds should be soaked and germinated before sowing. Soak the seeds in water at 50-55℃ for15-25min, while stirring continuously. When the temperature drops to 30℃, continue to soak for 8-12h, and change the water 1-2 times when soaking at room temperature. Then put it under the condition of 25-28℃ to moisturize and accelerate germination, and 1/3 seeds can be sown when exposed.

3. Sowing and raising seedlings

When sowing, the seedbed should be loose and fertile with strong water retention. The sowing amount per mu is about 0.2 kg. After sowing, cover with a layer of soil or plant ash, then cover with a layer of straw or wheat straw, and water. Keep the soil moist, after 8- 10 days, the seedlings can be unearthed, and then remove the plastic film. Interplanting after full seedlings, pulling out some dense seedlings and inferior seedlings, and properly controlling water and fertilizer at seedling stage to avoid bolting in advance because the seedlings are too large.