Optional three main varieties:
Six and green onions, drums and shallots, Yunnan shallots. For the cultivation of fresh products, the drums are mainly used in the cultivation from late March to July. The Yunnan onion can be cultivated during the rainy season from August to September. Six and small onions should be selected for cultivation from September to January. Retaining and growing the edible onion products in October should be planted with a large, fragrant drum-like variety.
Second, the base of the foot and the whole
Choose a fertile garden that is easy to fill and drain, and rotate with non-onion garlic crops. Individually heavy land needs to add 4000-7500kg of red loam soil per acre to improve the soil. The field before the sowing was ploughed and whitened. Base fertilizer: Apply 4000-5000kg of high-quality farmyard manure or 700-1000kg of decomposed chicken and duck manure, 50kg of calcium phosphate and 10kg of potassium fertilizer. Tricky: According to the planting habits, the width is 1.2m, the height is 20cm, and the surface is flat.
Third, the onion treatment
Select a variety of onion, full of noodles, no disease, no disability, no mold, no insects, uninjured onion peeling, usually peeled to single heart or double heart (ie one or two top buds), Seeding according to large, medium and small grades.
Fourth, reasonable close planting and seed quantity
According to the purpose of cultivation and the characteristics of the variety, the cultivation of sorghum is adopted. The distance between the ridges is 6-8 months from March to July, and the high temperature period from August to September is appropriately relaxed to 8-10 cm. . The amount of seed used per mu: according to the different water content of the onion, the sowing date is divided into early, middle and late, such as the early drum (from late March to April), the amount of seed per acre is 325-350kg, medium term (5-7 Month) about 200kg. Yunnan green onions, six and shallots about 100kg. In the later stage, the onion has a small water content, and the seed amount per acre is 30-40 kg.
Fifth, strengthen field management
1. Spray the herbicide in time after the sowing period: 50% acetochlor water can be used for 1000 times per acre, and wettable green granule powder can be mixed with water 800-1000 times.
2, timely spraying water after spraying herbicide: the first irrigation after spraying, to fill the foot, wetting, planting onions and soil contact, fight for 10 days, Qi Miao, full seedlings. If no seedlings are found within 10 days, they should be replanted in time.
3, do a good job of water-resistant seedlings: After Qi Miao, about 12-15 days after sowing, grab the appropriate water-resistant seedlings, control the moisture to the bottom of the ditch. Promote the development of the underground roots, the upper part of the ground is short and strong, and has strong anti-reverse ability, so that the growth in the middle and late stages is more vigorous.
4, scientific topdressing: spring and summer shallots are short-lived, topdressing is usually once or twice, the first time is carried out 12-15 days after planting. Combined with irrigation and mu, 17.5kg of compound fertilizer will be applied, and the second time will be applied to 15kg of compound fertilizer in 20-25 days. In autumn and winter, the onion grows long, the number of topdressing is the first, the second is the same amount of fertilization in spring and summer, and the third time is necessary to supplement nitrogen fertilizer. Each acre is applied with a 75 kg irrigation tank of ammonium bicarbonate.
5, pest control: 1 gray mold, rot, soft rot and other diseases, with 65% 1000 times or 65% zinc and Pu water distribution 1000 times or 65% Daisen zinc water 800-1000 times prevention. 2 Liriomyza sativae, onion flies, round-spotted spring worm, onion thrips and worms, sweet insects, with 50% phoxim emulsion with water 1000 times or 2.5% cypermethrin emulsifiable concentrate with water mist control.
Sixth, suitable harvest
In spring, it is generally harvested in 55-60 days. In summer, it is generally harvested in 38-45 days, and in autumn and winter, it is generally harvested in about 80 days. After harvesting, the dead leaves are removed, the outer sheath is white, no sand, and the bundle is 1-5kg. It can be placed in the refrigerator at a temperature of 17 ° C for 2-3 hours.
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