Spring onion cultivation technology

I. Variety selection Anniversary cultivation should choose cold-tolerant, drought-tolerant, heat-resistant, adaptable, onion-length, non-tillering varieties, such as Chinese giant onion, Zhangqiu onion and so on.

Second, stubble arrangements

(I) From January to March, the flatheads are spread in the greenhouse, and harvested and marketed in March to May.

(2) In mid-to-late March, flat shacks are spread in small sheds, harvested and marketed in June, or transplanted in mid-June, harvested and marketed or stored in winter from October to November.

(3) Sowing and seedling cultivation in open field in early April, transplanting in mid-to-late June, wide and dense planting, overwintering in open field, removing flower buds from March to April of the following year, harvesting and listing in April to May.

(4) Seeding and nursery in July-August, transplanting in early September-November, dense planting (plant spacing 3 cm), overwintering in open field, removing flower buds in March-April the following year, harvesting and listing in May-July.

(5) Seedlings are sown in mid-to-late September, overwintering in the open field, and harvested and marketed from March to April of the following year.

(6) Sowing and seedling cultivation in mid to late September, transplanting in mid-April of the following year, harvesting and marketing in July-August, or transplanting in June of the following year, harvesting and marketing or winter storage in October-November.

(7) Sowing in the greenhouse from late August to early September, shed in mid-October, harvesting and listing from December to February of the following year.

Third, management technology

(1) Management of seedbeds in winter and spring. Before wintering, the green onion seedlings should have 2 to 3 leaves. According to the temperature and soil humidity, the wintering water should be poured once before being frozen, and then covered with a layer of fully-fermented farm manure to ensure hoeing and heat preservation and ensure that the seedlings safely overwinter. In spring, the temperature rises, and the seedlings enter a rapid growth period. One or two times of seedlings should be carried out to make the seedling distance about 3 cm. Second, we must combine watering and top-up application of fast-acting nitrogen fertilizer or NPK compound fertilizer 2 to 3 times, 10-15 kg per acre each time, to promote the rapid growth of seedlings, harvest young shallots for sale on the market or cultivate strong seedlings for transplanting.

(2) Summer seedbed management. When raising seedlings in summer, it is in a hot and rainy season. The key to management is to do three preventions: one is to prevent pests. Secondly prevent grass damage. Before seedling emergence, the soil is closed with 100% spray of 33% weed control per acre, and weeds are manually pulled 2 to 3 times to completely eliminate weeds. Three water-proof stains. The seedbeds must be able to be watered by drought and drained by waterlogging.

(3) Transplanting. Before transplanting, apply sufficient bottom fertilizer, 6000 kg of fully decomposed high-quality farm manure, 30 kg of phosphorus fertilizer, and 50 kg of nitrogen, phosphorus, and potassium compound fertilizer. Apply 1/3 of the total bottom fertilizer and 2/3 concentrated furrow application. Seedlings should be graded when transplanting. Large and small seedlings cannot be mixed. If the green onions are listed, they can be densely planted with a row spacing of 60 to 70 cm and the plant spacing of 3 to 4 cm. If the green onions are listed, the row spacing is 80 cm and the plant spacing is 5 cm. After transplanting, timely tilling the loose soil, flat ridges, break the compaction, and promote the growth of green onion roots. Combined with watering and topdressing nitrogen, phosphorus and potassium compound fertilizer, topdressing 30 kg per mu. Depending on the growth of the green onion seedlings, the soil is cultivated in time to promote the formation of onion.

Fourth, soil treatment technology of heavy cropping Shallots should not be planted repeatedly. Otherwise, the yield will be seriously affected. If the crops are planted repeatedly, the soil must be treated.

(1) Add fully decomposed farmhouse fertilizer and phosphorus and potassium fertilizers to supplement the trace elements such as sulfur, zinc, calcium, magnesium, and iron required for the growth of green onions, to promote the robust growth of green onions and improve disease resistance.

(2) Use Luheng 1 to sterilize the soil.

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