When is the best time to harvest green onions?

It is most suitable to harvest green onions in July -65438+ 10.

Onion is a biennial herb in Allium of Amaryllidaceae. There are more than 100 kinds of Allium vegetables in China, which are mainly distributed in northwest, northeast and north China. Generally speaking, there are two traditional planting methods of northern Chinese onion: seedling raising in late autumn, planting in May-June of the following year or seedling raising in early spring.

The harvest season of the two methods is generally July-10, which will be delayed until the Spring Festival after storage. Heze Institute of High-tech Agricultural Sciences has cultivated a new variety of cold-abundant green onions and a set of new methods of off-season cultivation in the open field by taking advantage of the strong cold resistance of green onions, so that fresh green onions can be listed in the off-season from February to June, and the economic benefits have doubled.

It is planted in the north and harvested from September to April of the following year, which is the winter leisure time of the land. After harvesting the cold-rich green onions, it will not affect the planting of other crops.

Emergence time of scallion:

According to the different sowing season and temperature, the emergence time of green onions can be divided into:

1. Seeding for 9 days to 13 days in March and April in spring can produce seedlings;

2. Sow from May to September in summer and autumn, and emerge in about 8 days;

3. When using plastic film to raise seedlings, the temperature should be controlled at about 65438 08℃, and seedlings can emerge in 6 ~ 8 days after sowing. When the emergence rate reaches 60%, remove the plastic film in time, and it will be too late to make the seedlings thin and weak. After the seedlings stand upright, they can be watered 1 time to make cotyledons elongate and take root, so that the seedlings are stable, and then watered 1 ~ 2 times according to the soil moisture.