Technical methods of seed retention of scallions

The method of seed retention of green onions is to select the plants with variety characteristics when they are harvested, dry them in the field a little, and immediately plant the whole plant into a plot with isolated conditions and no continuous cropping. The width and depth of the ditch is generally 30cm to 35cm, the distance between ditches is 70cm and 80cm, and each ditch can plant 1 to 2 rows. The ditch applies high-quality farm manure and urea. And then insert the onions. Cultivate the soil before freezing. In February of the following year, when there were germinated new leaves on the back of the ridge, it marked that the plant began to turn green. The withered tip of the upper 20cm should be cut off in time to cultivate the soil. It was poured back to Qingshui in early March. The flowering period is from mid-late April to early May, urea or compound fertilizer should be applied in time, watering should be controlled during bolting, and the ground should be kept moist, but water retting should be prevented. During the flowering period, manual pollination was used to assist pollination, and spraying new high-fat membrane should pay attention to the prevention and control of diseases.

Another method is to separate onions and chives to keep seeds, this method mostly uses split propagation, need to set up a special field, do not add harvest. The cultivation in the planting field is the same as that in the production field, but the application rate of nitrogen fertilizer should be properly reduced and the amount of phosphorus and potassium fertilizer should be increased. Generally, the remaining fields planted in spring will be planted in autumn, while those planted in autumn will be planted in spring next year.