2. Choose fertilization. Onion nursery field should choose deep soil, fertile soil, convenient drainage, loam loose soil, and the former has not been planted onion, garlic, leeks and other Liliaceae vegetables. Combining 5,000 kg of high-quality farmyard fertilizer and 20 kg of compound fertilizer in Mushi, the land will be well-mixed and well-mixed with ground fertilizer to make it 1 to 1.5 meters wide and 10 meters long to facilitate field management.
3. timely sowing. Spring onion seedlings of welsh onion, from sowing to planting time is short, so proper early sowing is very important. In the middle and southern regions of the province, sowing is generally done in late March. The average mu seed amount is 2.5 to 3 kg, and an acre seedling can be planted with 6 to 8 mu of land. Sowing sowing method, sowing before sowing first, until the water seepage, the seeds mixed with the appropriate amount of planting ash or fine dry soil, repeated sowing several times, conducive to uniform seed distribution, and then cover 0.5 cm thick fine soil; You can also sprinkle the seeds first. The iron rakes can be used several times. Both methods are finally covered with a plastic film, so that it can not only heat and moisturize, but also emerge early. It usually emerges 6 to 7 days after sowing, and emerges 1 to 2 days earlier.
4. Field management. When the onion sprouts halfway out, uncover the mulch to prevent burns. After the seedlings were found, spotted shoots and early seedlings of onion seedlings were found to ensure that each onion seedling had the same nutritional area. During the growth period, the management method of “giving priority to the promotion†was adopted. The groundwater was poured in a small amount of water and less fertilizer was used to keep the soil moist and ensure nutrient supply. As the temperature rises, onion seedlings gradually grow, the demand for fertilizer and water increases, and the amount of watering and topdressing must also increase. Generally, each time watering 30 to 40 cubic meters/mu, topdressing urea 5 kg. The period of nursery is also a period of overgrown with weeds. It can be removed manually, and herbicides can also be used for removal. At the same time, attention is paid to the control of mantle to ensure that the onion seedlings grow neatly and uniformly and the individual is thick. One week before planting, stop watering and exercise the onion seedlings, which will help to rejuvenate the seedlings as soon as possible after planting.
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