1. Method of retaining green onions When harvesting green onions, select the plants with the characteristics of the varieties and dry them in the field. Immediately, the whole plants are planted in plots that are isolated and not heavy. The width and depth of the ditch are about 30-35 cm, the groove distance is 70-80 cm, and each ditch can be planted 1~2 rows, the row spacing is 10 cm, and the plant spacing is 5 cm. 17,000 to 19,000 plants per acre, and 33,000 to 38,000 plants in a row. Apply 3,000 kg of high-quality farmyard manure per mu, 15 kg of urea or 20 kg of compound fertilizer. Plan the furrows first, mix the soil with the soil, and then insert the onions. Clay the soil before freezing. In February of the next year, when there were new leaves on the back of the ridge, it marked that the plants began to turn green. It is necessary to cut off the top 20 cm of the tip in time and flatten the soil. Watered back to Qingshui in early March. From mid-April to early May, it is a flowering period. It is necessary to apply urea or compound fertilizer in time, 15-20 kg per mu. Watering should be controlled during the convulsion period, watering should be timely in the flowering period, and the ground should be kept moist, but the water should be prevented from rooting. During the flowering period, the artificially assisted pollination is often carried out by hand touching the flower ball, and attention is paid to the prevention and treatment of diseases. The yield of seeds per mu is about 50 kg.
     2, onion and fine shallot retention method
     Most of the onion and the chives are propagated by ramets. It is necessary to set up a special plant for cultivation and no harvesting. The cultivation of the remaining fields is the same as that of the production of the field, but the amount of nitrogen fertilizer should be appropriately reduced to increase the phosphorus and potassium fertilizers. Generally planted in spring, it can be used for planting in autumn; planting in autumn can be used for planting in the spring of the second year. Generally, about 0.5 to 0.67 hectares (8 to 10 mu) of field can be planted and planted per acre.
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