When is the right time to plant onion seedlings? How to cultivate it?

Common onion seedlings are green onion seedlings, onion seedlings and so on, so when is it appropriate to grow? How to cultivate it? General simple solar greenhouse sowing, flat bed sowing, March to May small green onions on the market. Let's learn more about it.

When is the right time to plant onion seedlings?

From January to March, ① was sown in a simple solar greenhouse, sowed in flat beds, and small green onions were put on the market from March to May.

In the middle and last ten days of ②, the seeds were sown in the small arch shed and sowed in the flat bed, and the small green onions appeared on the market in June. It can also be transplanted in the first and middle of June and harvested from October to November or stored in winter.

③ sowed and raised seedlings in the open field in the first ten days of April, planted in a wide border in the middle and last ten days of June, overwintered in the open field, removed the flower buds in March to April of the following year, and put onions on the market from April to May.

④ sowed and raised seedlings from July to August, transplanted and densely planted (3 cm apart between plants) from September to early November, overwintered in the open field, removed buds from March to April of the following year, and put onions on the market from May to July.

⑤ sowed and raised seedlings in the middle and last ten days of September, the seedling bed overwintered in the open field, and the green onions appeared on the market from March to April the following year.

⑥ sowed and raised seedlings in mid-late September, transplanted in mid-April of the following year, harvested green onions from July to August, or transplanted in June, and harvested and stored in winter from October to November.

⑦ sowed seeds in the solar greenhouse from late August to early September, fastened it in the middle of October, and appeared on the market from December to February of the following year.

How to cultivate onion seedlings?

1. Seeds: new seeds with good seed selection, black and glossy seeds. Sow 2 kilos per mu and plant 4 mu.

2. Bacterial agent: Gymboree root seedlings can significantly promote the rooting of onion seedlings and enhance the ability of root absorption and fixation. It is mainly used in the seedling stage of onion, garlic and other crops, mixed in nutritious soil or in the middle and later stages of planting, transplanting, bed border irrigation, dipping in roots and foliar spraying, which can increase soil temperature, germinate early and promote weak seedlings to become strong seedlings. When planting and transplanting, the slow seedling takes root quickly, enters the high yield period in advance, and can prevent overgrowth, prolong the harvest time, disease resistance and stress resistance.

3. Sowing: raising seedlings in Xiangyang plot. The land of legumes, eggplant fruits and melons that were fat and active in the past is the most ideal. 5000 kg of rotten ring fertilizer was applied per mu, which was formed into a flat bed of 80 cm to 90 cm, with an interval of 30 cm between the borders, so as to press the soil after plastic film mulching. Sow seeds when the ground temperature reaches 2: 3 ℃ in early March. Soaking seeds to accelerate germination before sowing. Sow seeds after irrigation and sowing in the border, then cover the plastic film with a width of 90cm and 100cm.

4. Management: about 10 days after sowing, the seedlings began to be unearthed, stretched the film, propped up 10 cm high with bamboo or locust strips on both sides, and compacted with soil around. When the seedling height is 6-9 cm, thinning seedlings according to 3 cm square, apply 1000-1500 kg of human faeces and urine per mu of water, and gradually remove the film for open field management. When the seedling height is 1215cm and 15 days before planting, the fertilizer is applied once, and the ammonium sulfate is applied 10kg / mu each time. Pull the grass in time.

5. Disease and pest control: at seedling stage, spray the same amount of Bordeaux solution with 1purl and 200 or 655 Dysen zinc and 75% chlorothalonil 600-fold solution to control purple spot; use vegetable leaf extract with 90% trichlorfon 400-fold solution, and put it into the field to trap and kill tigers at night.