Spring onion cultivation technology

I. Variety selection Anniversary cultivation should choose varieties that are cold-tolerant, drought-tolerant, heat-resistant, adaptable, long onion, and undivided, such as Chinese giant onion and Zhangqiu onion.

Second, stubble arrangements

(I) From January to March, flat sedges were spread in the greenhouse, and harvested and marketed in March to May.

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

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

(4) Seeding and seedling raising 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, wintering in open fields, and harvesting and marketing in March-April 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, harvest from December to February of the following year.

Third, management technology

(1) Management of seedbeds in winter and spring. Before wintering, 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 can safely survive the winter. In spring, the temperature rises, and the seedlings enter a rapid growth period. One to two seedlings must 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 nitrogen-phosphorus-potassium compound fertilizer 2 to 3 times, each time 10 to 15 kg per mu, 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 diseases and insect 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 plucked 2 or 3 times to completely eliminate weeds. Three water-proof stains, the seedbed should be able to dry, waterlogged and drained, and no water can accumulate in the seedbed.

(3) Transplanting. Before transplanting, you should apply sufficient bottom fertilizer, and apply 6000 kg of fully decomposed high-quality farm manure, 30 kg of phosphorus fertilizer, and 50 kg of nitrogen, phosphorus, and potassium compound fertilizer per acre. Seedlings should be graded when transplanting. Large and small seedlings cannot be mixed. If green onions are listed, they can be densely planted with a row spacing of 60 to 70 cm and plant spacing of 3 to 4 cm. After transplanting, the soil should be tilled in time, flat ridges should be ridden, the compaction should be broken, and the root system of green onion should be promoted. 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, soil is cultivated in time to promote the formation of onion white.

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) Applying 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 shallots, promote the healthy growth of shallots and improve disease resistance.

(2) Use Luheng 1 to sterilize the soil.

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