1. Delayed planting of green onions in autumn
Growers can raise seedlings in the open field in mid-to-late May and transplant green onions from late July to early August.
For delayed autumn planting of green onions, a 6-meter-wide medium arch shed or a 3-meter-wide small arch shed facility should be used for delayed autumn planting. Green onions will be harvested in November and December.
The delayed planting model of green onions in autumn focuses on solving the problems of slow growth of green onions at low temperatures and anti-freezing and preservation of green leaves of green onions, achieving preservation of green onions and extending the supply period of green onions.
2. Overwintering planting of green onions
Growers should carry out green onion seedling cultivation at the end of October, using small sheds covered with thatch as green onion seedling facilities, and planting green onions in late January of the following year. , using a large shed covered with two films and one thatch for overwintering planting, and harvesting in April and May.
The green onion overwintering planting model focuses on solving the problem of normal growth of green onions during the low temperature period and preventing vernalization, bolting and flowering during the winter. In April and May in spring, growers can produce high-quality fresh-keeping green onions. .
3. Over-summer planting of green onions
Growers should raise seedlings from the end of January to early to mid-February, using Fengzhang and Yangqi as green onion nursery facilities. Growers will start planting in late April. Green onions can be harvested from mid-to-late July to early to mid-August.
The over-summer planting model of green onions solves the technical problems of difficult summer growth and soft green onion pseudostems, and enables the production of high-quality green onions in high-temperature seasons.
Extended information:
Cultivation technology:
1. Colonization
Colonization period: The requirements for the colonization period of onions are not strict. It can be planted from early September to early July.
Prepare the soil carefully and apply sufficient base fertilizer
Choose plots with high and dry terrain, deep soil, convenient drainage and irrigation, and fertile soil for cultivation. Before plowing the land, apply 4,000 kilograms of fully decomposed farmyard manure per acre or in the furrow before planting. 15kg of urea, 20kg of superphosphate or 20kg of compound fertilizer should be mixed into the farmyard manure, and then plowed deeply and leveled. Make furrows into ridges.
Strictly select seedlings and plant them as early as possible
Water the seedlings once two days before they are raised to ensure that they are dry and wet when they are raised. During the seedlings, diseased and residual seedlings should be removed and strong seedlings Graded colonization.
Reasonable planting
The row spacing is 80 cm, the plant spacing is 3-4 cm, and it is appropriate to plant 20,000-30,000 plants per acre.
Colonization methods
Generally, the methods of rowing and inserting onions are used. Short white onions are suitable for rowing onions, and long white onions are suitable for planting. The planting depth should be consistent with the top and bottom, that is, the center leaves of the onion seedlings should be 7-10 cm above the ditch surface.
2. Field management:
Irrigation
Generally divided into four stages. The first stage is the seedling over-summer period. No matter which method is used for planting, sufficient planting water must be poured, and then during the seedling slowing period of about 20 days, the water should be dry rather than waterlogged to prevent root rot. The second stage is the peak period of leaf growth. From mid-August onwards, the roots will return to the peak leaf stage. Water lightly depending on the situation of the seedlings. The third stage is the period of vigorous growth and white formation of green onions; it is a critical period for water management, and the principle of frequent and heavy watering must be mastered. The fourth stage is the late growth stage of green onion. After late October, irrigation should be gradually reduced.
Top dressing
Generally, three top dressings are required. The first time is in early August after the seedlings have slowed down and before they enter the peak leaf development period, with 5-10 kg of urea per acre; the second time is The first time is in late August, when the leaves are in full bloom. Apply 5-10 kg of urea and 15-20 kg of potassium sulfate per mu. The third time was carried out in early September, with 5-10 kilograms of urea per mu. If the fertility is high, the second and third top dressing may not be carried out.
Cultivating soil to soften
Cultivating soil has the effect of softening green onions and preventing lodging. It must be carried out in stages during the green onion formation period, in early August, late August, and early September. The first and second soiling depths are 15 cm each. Generally, the ditch is leveled after the second soiling, and the third soiling is About 7.5 cm, the soil between the rows is cultivated onto the planting rows, so that the original ridges become furrows and the original furrows become ridges.
Reference: Baidu Encyclopedia-Onion