When raising seedlings, seedlings should be raised according to the water content of the seedbed. If the seedbed is too dry to raise seedlings, a small amount of water should be poured 1~2 days before sowing, and seedlings should be raised when the humidity is suitable. Hold the roots of the onion with your hands when lifting the seedlings, and then gently lift the seedlings with a fork or shovel. In the process of seedling emergence, appropriate force should be applied to avoid root injury and root breakage. After emergence, shake off the soil at the roots, then remove the dead leaves, and remove the plants that do not meet the requirements. Finally, put them in order.

Step two, onion seedlings are graded.

Generally, onion seedlings in seedbeds vary in size and can be classified according to their size. Generally can be divided into first-class and second-class. If the number of seedlings is sufficient, the first-class seedlings can be transplanted. If there are not enough seedlings, they can be transplanted separately according to their size, which is beneficial to field management in the later stage.

Bundle seedlings after grading. If it is far away from the transplanting place, it should be properly shaded during transportation to avoid strong light from irradiating the seedlings. Seedlings that are not planted late that day should be stored in a cool place with their roots down, and should not be piled up, so as to avoid rotting seedlings caused by the heat emitted by breathing at night.

The third step, cutting leaves and planting.

Cutting leaves before planting can reduce the transpiration of onion leaves, accelerate the delay of seedling emergence and improve the yield. The specific method of cutting leaves is: align and bind the roots of onion seedlings, then cut off the upper leaves, leaving only about 10 cm of fake stems and onion leaves, and plant them immediately after cutting leaves.

Step 4: chemical treatment.

Using 200 grams of potassium dihydrogen phosphate +200 grams of Oxfam emulsifiable concentrate mixed with 20 liters of water and planting while dipping roots can prevent the harm of underground pests such as onion flies.

Step 5: Transplanting and planting

Transplant planting methods mainly include transplanting method and pendulum planting method.

1, planting mode

According to soil conditions, transplanting methods can be divided into wet transplanting method and dry transplanting method.

Wet planting method: If the soil is dry, water the furrows before planting. After underwater infiltration, according to the plant spacing, put the root of the seedling on the bottom of the bed with one hand, and put the onion fork against the root with the other hand, and then insert it into the soil. Then, lift the onion fork, cultivate 7~ 10 cm on both sides of the onion after planting, and step on it.

Dry insertion method: If the soil moisture is moderate, dry insertion method can be used, and the operation steps are the same as wet insertion method, except that the onion seedlings should be watered after being inserted.

2, pendulum planting method

Swing planting method is to arrange onion seedlings on one side of planting ditch according to plant spacing. In order to avoid sun exposure, ridges are generally placed on the west side in the north-south direction and on the south side in the east-west direction, and then the trench bottom soil is taken to cover 7~ 10 cm. Immediately after planting, irrigate the planting water. Pay attention to irrigating the planting water with a small amount of water, and don't wash the seedlings down. Cover with a layer of soil to keep moisture after watering.

The advantage of transplanting method is that the onion stands upright in the later stage; The advantage of swing planting method is fast planting speed, but the base of onion stem is easy to bend in the later stage, which affects commercialization. Onion farmers should use it flexibly according to the actual situation when choosing. Three to five days after planting, according to the soil moisture, the seedlings can be properly watered once, and then the seedlings can be cultivated in the middle. At this point, the planting and transplanting of onions have all been completed.