1. Seeding and seedlings The seedlings of the green onions should be flat, fertile, convenient for irrigation and drainage, and rich in loam. The mouth of the mouth should be selected from the rotation of onion and garlic in 3 years. The onion seedlings have a long period of seedlings. Generally, 2500 to 3000 kilograms of organic fertilizer or soil-fertilized fertilizer is applied per mu, shallowly turned, flattened, and made into a pot. When conditions permit, 25 kg of superphosphate can be added; when the underground pests are serious, it can be controlled by poisonous valley. The effective growth time of the green onion seedlings is 80-90 days. Generally, the frost-free period is suitable for spring sowing in areas over 200 days. The Yangtze River basin is usually planted from early February to early February. Use 1 to 1.5 kg per mu of land, usually with dry seeds for spreading or stripping. Spreading is to first lay a layer of fine soil on the seedlings for covering the soil, fill the water with the sputum, and then sprinkle the seeds evenly, and then cover the soil 1 to 1.5 cm thick. The seeding is a shallow ditch with a depth of 1.5 to 2 cm in a row of about 15 cm in the raft. The seed is planted in the ditch, and the sputum is flat and the surface is pressed. Spring sowing seedlings, keep the soil moist when seedlings, in order to facilitate emergence. After the seedlings are released, water is poured in time, and when three true leaves are controlled, the watering is controlled to promote root development. After 3 leaf stage, sufficient water and fertilizer are used to accelerate seedling growth. When the onion seedlings are 50 cm high and 8-9 leaves, 10 to 15 days before planting, the watering should be stopped, the seedlings should be exercised, the leaves should be old and firm, and the pseudo stems should be firm to facilitate the transplanting. Each acre of onion can be planted in an area of ​​5 to 8 acres.
2, the planting period of the planting green onions is not strict, the Yangtze River basin is generally planted in the middle to late May to early June. Before the planting of the green onions, the grain fields and vegetable fields that have not been planted with onion and garlic crops within 3 years are suitable. It should be cultivated on a plot with high dryness, deep soil layer, convenient drainage and fertility. Before planting, apply 5,000-7000 kg of decomposed organic fertilizer per acre; in the area where the planting period is close to the rainy season, the planting onion should not be ploughed too deep, because the soil layer is loose, it is easy to collapse when ditching, and it is easy to accumulate water. seedling. When the green onions are planted, the average row spacing is 5-6 cm x 50-55 cm, 22,000 to 24,000 per acre. Digging trenches 8 to 10 cm deep, digging the north-south ditch, placing the onion seedlings along the steeper side of the ditch wall according to the plant spacing, the roots of the onion roots pressing the bottom of the ditch, and then picking up the soil from the other side of the ditch. Buried in the decentralized area of ​​the outer leaves of the onion, with the foot steady, and then watered along the ditch. The planting depth of the green onion seedlings should be mastered on the principle that the onion seedlings are not more than 7 to 10 cm above the ditch.
3. Field management After the green onion is planted, the slow seedling period ends in the summer and rainy season. At this time, its high temperature and early resistance is far stronger than the water infiltration resistance. Therefore, in this period, it is not necessary to water the flood, generally do not need to water, drain in time after the rain, avoid water accumulation. Let the roots update quickly and the plants turn green. The slower summer seedling period does not water, no top dressing, only shallow cultivating, more loose soil, timely weeding, improve soil aeration. As the plant grows, the soil is loosened in time after each rain or after watering. After the beginning of autumn, the weather gradually cooled, the temperature difference between day and night increased, the plant growth rate increased, and the scallion began to grow. The sallow elongation is carried out throughout the growing season. At this time, it is necessary to topdress the fertilizer, chasing 2,000 kilograms of farmer's fertilizer per acre, spreading it on the back of the ridge, then applying 10 kilograms of urea, shallowing it once, putting the farmyard manure and urea into the ditch, and then pouring it once to promote its growth. After the heat, enter the tubular leaf growth period, to catch the quick-acting nitrogen and potassium fertilizer, apply 15 kg of urea per acre, add 20 kg of potassium sulfate, and break the ridge to cultivate the soil. In September, the scallion began to grow boldly. Still need to apply quick-acting nitrogen and potassium fertilizer, the same method as before. After topdressing, the soil is cultivated, and the height of the soil is not required to be buried. As the plant grows and re-cultivates the second pass, the soil is generally cultivated 3 to 5 times. Between the autumn and the white dew, the watering should be carried out in the morning and evening, and should be lightly poured. The water should be poured after the white dew to the autumn, and the soil should be kept moist to meet the growth requirements of the scallion. After that, the water is poured once every 6 to 7 days, and the water is poured through the water, and the water is kept between the two waterings. When the water is sufficient, the leaves are dark, the wax powder is thick, and the leaves are filled with colorless and transparent mucus, which is a sufficient expression of water, and the white onion is also white and shiny.
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