Transplanting multiple seedlings in lush region of northern China. The main production areas in the middle and lower reaches of the Yellow River are mostly planted in the autumn, but the number of seedlings before the winter should not be strictly controlled. There should be no spring in the south of the Yellow River. When the local temperature reaches 7°C, the seed should be planted tightly. Green onions are suitable for loam cultivation at pH 6.5-7.5. The nursery requires loose fertilizer and sufficient ground. Emergence period to prevent topsoil compaction, seedlings began to grow quickly when topdressing, control soil moisture 10-15 days before planting to prevent leggy lodging.
During the period from June to July, the landrace type spacing was 70 cm, and the short white type and chicken leg type spacing were about 50 cm, and the plant spacing was about 5 cm. In order to increase the depth of pseudo-stem penetration, Changbai type varieties are deep (15cm below ground level), short white type is about 10cm deep (ditch depth), planed pine ditch bottom, onion seedlings are planted in the ditch, and the depth of soil is 5-7cm, normal growth. The 1000 kg of green onions need to absorb 2.7 kg of nitrogen, 0.5 kg of phosphorus, and 3.3 kg of potassium. When the soil hydrolyzable nitrogen is lower than 80ppm during the growth period, the available nitrogen fertilizer must be applied. Adding phosphorus and potassium fertilizers can increase production and improve quality. The management of high temperature seasons is mainly for flood control and weeding and seedling maintenance, and vigorous growing season requires sufficient soil moisture.
Earthing prevents lodging of onions and softens pseudostems. It is an important part of cultivation and management of green onions. The plants began to thrive and when the height of the pseudo-stem exceeded the ground level, the top soil was ditched in combination with topdressing. When the pseudostem is about 10cm above the ground, earth is used. The Changbai type cultivated earth twice, and the false stem was buried 30-40cm. The short white type and the chicken leg type were earthed once, and the false stem was earthed about 20cm. If there is no soil during the growth period, the plants can be discharged upright in the softening bed after the harvest, and the sandy soil is filled from the space of the dummy stems. The bed bottom is kept moist and the upper part is protected from rain. The warm season is 25 days, and the cool season is about 40 days. This method is more effective in softening and loss, but it can be planted densely during cultivation, and it is easy to obtain high yield.
The green onion has a wide range of temperature adaptation and can be harvested from the seedlings to the convulsions. In addition to cultivating fully-grown scallions in the autumn, spring onions (onions with insufficient vegetative growth) were also cultivated in other seasons.
Collect seeds. There are two kinds of seed production methods, adult and semi-planted. Planting seeds: Seedlings that are fully grown in the fall are easy to seed, but the cost is high and they are used when the original species is grown; Semi-plant seeding: Summer seeding and cultivation into semi-growth plants as seedlings, before winter Planting, low cost, cycle shortened by one year. Welsh onion is easy to cross pollination, isolation of seeds between varieties.
The green onions harvested in the early winter are bundled and dried in a shallow ditch at the shade. The use of low temperature below 0 °C can be stored for more than 100 days, during storage to keep the onion bundle lightly frozen, and avoid repeated thawing. The air humidity should be about 80%, which can cover the grass moisturizing rain. Onion has no natural hibernation characteristics. Although pseudostems can be stored for a long time at room temperature, they are very expensive.
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