In recent years, some areas have introduced Japanese green onion varieties that are resistant to cold and late bolting. After development, about 5,500 acres of green onion cultivation bases have been formed. Through groping, a set of high-efficient cultivation techniques for spring onions in Japan was summarized.
Select Yuan Zang, Chang Yue, Akihiko and other varieties. Japanese green onions are 30 to 40 cm long and stems are 2.2 to 3 cm in diameter. The leaf sheaths are tightly packed and are not easy to lodging. They are resistant to heat and cold, and some do not twitch until the end of April.
Nursery. 15 to 20 days before sowing, combined with soil preparation and seedbed per acre, 1500 kg of organic fertilizer, 40-60 kg of superphosphate, and 15 kg of ternary compound fertilizer. Soil treatment was performed by spraying the phoxim solution on the bed 3 to 4 days before sowing. Sowing in April, the amount of 100 grams per acre should be appropriately broadcast. Before sowing, sufficient water shall be poured, and after the water is fully infiltrated, the seeds shall be sowed with appropriate amount of dry fine soil or fine sand. After sowing, the cover soil shall be 1 cm thick, covered with a plastic film and a shade net, and shall be withdrawn after emergence. Seedlings have 2 to 3 leaves combined with water applied per acre urea 1 to 2 kg. Seedling height 25 to 35 cm, pseudo-stem diameter 7 mm, there are 3 to 4 true leaves stop watering, appropriate hardening seedlings, ready for planting.
Field management: 1. Moisture management. After onion colonization, it is in the high-temperature season. Plants grow slowly, require less water, and generally do not water, prompting the rapid renewal of the root system. Drain the water immediately after the rain to prevent rot. 2. Fertilizer management. Welsh onions like nitrogen and potassium, the growth of the early stage of nitrogen fertilizer, urea 20 kg per mu; growth combined with soil fertility applied 3 to 5 times fertilizer, fertilizer applied at a time three yuan per compound of 10 kg. 3. Timely mechanical earthing. Soil can soften light blue and improve quality. Green onions need to cultivate 4 to 6 times in the whole growth stage, artificial cultivation of soil, and easy to cause mechanical damage.
Prevent pests. Onion pests are leafflies, Spodoptera litura, etc., to prevent early treatment. Sudden sunshine after rainstorm in summer, green onion prone to downy mildew, can be sprayed in the early stages of anti-virus drugs 64% Mn Zn wettable powder, 25% metalaxyl WP, EKL 72% urea manganese zinc wettable powder Drug control, once every 10 days, continuous control 2 to 3 times. There are wax powder on the onion leaf surface and it is not easy to get the medicine. To increase the adhesiveness of the liquid, an appropriate amount of neutral detergent should be added when spraying. The drug was stopped 7 to 15 days before harvest.
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