First, sowing seeds. Sowing seedlings in the middle of September. Select oyster land plots with high topography, fertile soil, convenient irrigation and drainage, and a deep layer of cultivation (non-onion garlic), 667 m2 of composted organic manure 2000-3000 kg, and after ploughing, 667 m2 Shi Sanyuan Compound Fertilizer 35 kg, mix well into 0～15cm deep soil layer, after the flattening, the whole length is 5～10m, the surface width is 100～120cm, and the width is 30cm. Putian, dredge Irrigation gutters should be well drained to facilitate management. The main selection of varieties 1 or Zhangqiu spring onions. New seeds were produced that year and germination tests were conducted before sowing. When sowing, if there is not enough lyrics, the first step is to pour water from the bottom of the plant. After the water is poured on the surface, 2 to 3 grams of onion seeds will be sown per square meter. When sowing seeds, the onion seeds can be mixed with the appropriate amount of sediment and repeatedly repeated. Do the next kind of uniform, thin broadcast volume, and then cover fine soil 0.5 to 1 cm. After seeding, the seedlings become dark grooves and imperfections.
Second, seedling management. After sowing, it usually takes 7 to 10 days until the seedlings emerge. After emergence, they are generally not watered until the cotyledons are straightened, so as to avoid causing the formation of plate knots and siltation. It is best to use shade nets to cover the nursery to ensure that the surface of the noodle is well ventilated and well ventilated. Seedlings should be removed promptly after unearthing. About 5 cm high seedlings, appropriate watering 1 to 2 times, with 667 square meters of water flushing urea 5 kg or ammonium bicarbonate 15 to 20 kg.
Third, scientific colonization. Colonization was carried out before the beginning of winter in early November. The planting field will be 3,500kg per hectare of Puxi organic fertilizer, ploughing 20-25cm deep, then applying 50kg of compound fertilizer and 5-7kg of biological potash. After the site preparation, the ridges were formed. The ridge height was 10-15 cm, the ridge width was 70 cm, and the ridge spacing was 30 cm, covering a 90 cm wide mulch. Then, line spacing 15 cm (side by side line), spacing 6 cm, punching in the mulching and colonization, pouring water and sealing the planting hole. 5 rows per small high ridge planted 40,000 to 45,000 plants per 667 square meters. Seedlings when the seedlings 2 to 3 true leaves, to make the onion leaves the direction and direction of vertical movement, the depth to not bury the green heart is appropriate. After the planting and easing of seedlings, the above-ground parts basically stopped growing, and the wind barriers should be set up for protection against cold before the land is frozen to protect the seedlings from wintering safely.
Fourth, cover film after the spring. Covered with a large arch or a small arch. With a large shed, the shed film will be covered in early February and will not be covered with straw rakes. With a small arch, it is covered in late February or early March. After the film is covered, the temperature in the booth is maintained at 5°C to 28°C and no watering is performed. Before the greenhouse temperature rises and green onions enter the prosperous period of the long leaf, the mulching film is removed, watered immediately, and urea is applied with water (10 to 15 kg of urea per 667 m2). In late March, gradually increase ventilation until the removal of the film. Afterwards, according to the growth of onion seedlings, reasonable fertilization watering, see dry see wet, promote the growth of onion.
Fifth, timely harvest. After the end of April, the market will be available at any time according to market demand. The concentrated harvest period is generally in the middle or late 5th. Fresh onion 4500-6000 kg can be harvested every 667 square meters.
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