Cultivation and management techniques of scallions

1. Soil selection and sowing
The growth period of the scallions is short, and it is advisable to choose water and fertilizer for cultivation. Combine the land with ploughing and apply sufficient base fertilizer, apply 4000-5000 kg of organic fertilizer per acre, 50 kg of superphosphate, and plow the land for 畦, 畦 1- 1-1.2 m, row spacing 20-25 cm, row 4 rows, every 667 square The seeding amount of rice is 1-1.5 kg, and the shallow soil is pressed and watered after sowing. The scallions in the valley can be sown all year round. The most suitable sowing period in high altitude areas is divided into spring and autumn, spring 3-4 months, harvest from June to July, autumn in August, and harvest from October to November. The wintering cultivation in the elevation area is planted from late September to early October, and harvested in March-April.
         2, watering and fertilizing
The shallots are fresh and tender leaves and sheaths, so the watering should be sufficient, especially after sowing until the plant height is 15 cm. The sufficient water can promote the rapid growth of the shallots. After entering the middle growth period, the watering should be gradually reduced. Extreme drought or excessive humidity causes the roots to be thick and the tip of the leaves to wither, affecting quality. In fertilization, the growth of the leaves should be promoted mainly, and the quick-acting nitrogen fertilizer should be applied. The spring onion harvested in the summer, in the management of fertilizer and water, to promote the end, after the seedlings begin to grow vigorously, generally every 20 days or so, topdressing 1 quick-acting nitrogen fertilizer, with the appropriate amount of phosphorus, potassium fertilizer, sulfuric acid can be applied per acre About 15 kg of ammonium. In the autumn, weeding the green onions, we must properly control the fertilizer before the winter onion, in order to prevent excessive seedlings before winter, and a large number of early convulsions occur in spring. After the green onion is returned to green, it will be poured back into the Qingshui in time, and the green fertilizer will be applied back to promote the early growth of the seedlings. The urea can be applied for about 15 kg per mu, or other nitrogen fertilizers with similar nutrition. In the future, about 15 kg of ammonium sulphate per acre will be applied, and combined with top dressing, watering should be fully used to strengthen vegetative growth, prevent or delay convulsions, and increase the yield of shallots. And to harvest in time.