When is the best time to plant onion seedlings?

The best sowing date of onion seedlings is from mid-September to-65438+1early October.

Green onions are usually sown in autumn, followed by spring. The best sowing date is from mid-September to around-65438+1early October. Because scallion seedlings need to survive the winter, it is necessary to master certain planting management methods when sowing scallion, in order to cultivate strong scallion seedlings.

Under normal circumstances, it is most beneficial to germinate and emerge by sowing green onions in the warm and humid climate from September to June at 65438+ 10. Premature sowing is easy to cause vigorous growth, which is not conducive to safe wintering. Early bolting will also occur in the next spring. When sowing is too late, the young Chinese onion seedlings can't grow to the standard of two leaves 1 heart before winter, so they are prone to freezing injury during winter.

Welsh onion is a shallow-rooted crop with underdeveloped root system, weak ability to absorb water and fertilizer, and neither drought nor waterlogging tolerance. Therefore, if the green onion seedlings are strong, it is necessary to choose land with rich and deep soil, loose and transparent, sunny and close to water, and convenient irrigation and drainage, preferably light sandy soil with good drainage conditions.

Management of Welsh onion after emergence

After sowing, green onions can germinate and emerge in about a week under suitable water, fertilizer, light and thermal environment conditions. When most of the seedlings are unearthed and grow to about 2-3 cm, the plastic film on the ground should be removed in time, and appropriate thinning and weeding should be carried out according to the situation, and then a little water should be poured in the morning and evening according to the wet and dry conditions of the seedbed. If necessary, low-concentration carbendazim and other drugs can be sprayed to control pests and diseases.

When the onion seedlings grow to about 8 cm, they can be watered with 15% diluted human excrement or 0.5% urea water according to the growth of the seedlings.

When the green onion seedlings grow to a certain height, they can be transplanted and planted. It should be noted that sufficient water should be poured before seedling emergence, and then seedlings should be raised with soil to avoid damaging the root system and affecting the slow growth and survival of seedlings. At the same time, attention should be paid to seedling classification for unified management in the later stage.