Farmers can raise seedlings in the open field in the middle and late May, and green onions can be planted from late July to early August.

In autumn, the late planting of green onions should be carried out in a middle arch shed with a width of 6 meters or a small arch shed with a width of 3 meters, and the green onions should be harvested in 1 1 and 65438+February.

The delayed planting mode of spring onion in autumn mainly solves the problems of slow growth of spring onion at low temperature and anti-freezing and fresh-keeping of green leaves, realizes the fresh-keeping of spring onion and extends the delivery date of spring onion.

Onions are planted in winter.

The planters should carry out the green onion seedling raising at the end of 5438+ 10, and use the small arch shed to cover the grass stems as the seedling raising facilities. In June 5438+ 10 of the following year, the scallion should be planted at the end of the year, overwintering in a large arch shed covered with two films and one stalk, and harvested in April and May.

The overwintering planting mode of Chinese onion mainly solves the problems of normal growth of Chinese onion in the low temperature period in winter and prevents vernalization bolting and flowering. In April and May of spring, growers can produce high-quality fresh-keeping green onions.

Onion is planted in summer.

Growers should raise seedlings from the end of June to the first half of February in 5438, and use wind barriers and sunshine beds as facilities for raising seedlings of green onions. In late April, growers will start planting green onions and cover them with sunshade nets for planting in summer. Green onions can be harvested from the second half of July to the first half of August.

The planting mode of green onion in summer solves the technical problems of difficult growth of green onion in summer and soft false stems of green onion, and realizes the production of high-quality green onion in warm season.

Extended data:

Cultivation techniques:

1, colonization

Planting period: onion planting period is not strict, and it can be planted from early June to early July.

Carefully prepare soil and apply sufficient base fertilizer.

Choose plots with high and dry terrain, deep soil layer, convenient irrigation and drainage and fertile soil for planting. Before ploughing, 4,000 kg of fully decomposed farm manure should be spread or furrowed before planting, and urea 15 kg, 20 kg of calcium superphosphate or 20 kg of compound fertilizer should be mixed into the farm manure in advance, and then deep ploughing and harrowing should be carried out, furrowing and ridging should be carried out.

Early planting of seedlings in YEATION

Water once two days before emergence to ensure that the seedlings are dry and wet properly. When seedlings emerge, diseased and residual seedlings should be eliminated, and strong seedlings should be planted in different grades.

Reasonable colonization

The row spacing is 80 cm, the plant spacing is 3-4 cm, and it is appropriate to plant 20-30 thousand plants per mu.

Planting method

Generally, the method of arranging onions and inserting onions is adopted. Chopped onions are suitable for short white onions, and inserted onions are suitable for long white onions. The principle of uneven planting depth should be mastered, that is, the heart leaves of onion seedlings should be 7- 10 cm higher than the ditch surface.

2. On-site management:

water

Generally divided into four stages. The first stage is the delayed growth period of summer seedlings. No matter which method is used for planting, it is necessary to pour enough planting water, and then in about 20 days when the seedlings grow slowly, the water should be dry rather than waterlogged to prevent root rot. The second stage is Ye Sheng stage. After mid-August, the root system returns to the peak of leaf growth, and a small amount of water is poured according to the seedling situation. The third stage is the vigorous growth and formation of scallion; Now is the critical period of water management, so we should master the principle of frequent watering and heavy watering. The fourth stage is the late growth stage of Chinese onion. After 10, irrigation should be gradually reduced.

Superficial application

Generally, topdressing is needed for three times. The first time, after the seedlings grow slowly in early August and before the Ye Sheng stage, topdressing urea is 5-10 kg per mu; The second time was in late August, when the Ye Sheng period was coming, and urea 5- 10 kg and potassium sulfate 15-20 kg were applied per mu. The third time was at the beginning of September, and the topdressing of urea was 5- 10 kg per mu. If the fertility is high, the second and third topdressing can be omitted.

Soil softening

Cultivating soil can soften onions and prevent lodging. It must be carried out in stages during the formation period of green onions, in early August, late August and early September respectively. The depth of the first and second ridging is 15cm. Generally, the ditch is leveled after the second ridging, and the third ridging is about 7.5cm. The soil between rows is ridged on the planting row, so that the original ridge becomes a ditch and the original ditch becomes a ridge.

References:

Baidu encyclopedia-onion