The onion has the characteristics of less investment, high yield, simple management, and high efficiency. It is an ideal vegetable variety for the commercial production of vegetable farmers and increasing income. In early September, it is the best time for onion seedlings. The key points for raising seedlings are described below.

Selection

In production, Ziyue No.1, Ziyu No.2, Zixing, Zihuanhong and other purple skin varieties can be used. These varieties have the characteristics of strong spicy taste, high yield, excellent quality, and suitable for export. These varieties generally produce about 5,000 kilograms per mu, and the high-yield plot has a production capacity of 7,500 kilograms per mu.

Seed bed

Seedbed should be selected for loose soil, fertile, strong water retention, and no onion or garlic vegetable plots were planted within 3 years. In order to cultivate seedlings per acre, the seedling area needs about 35 square meters, with a seed amount of 0.5 kilograms. Before sowing, apply sufficient farmyard manure, plus nitrogen, phosphorus, potassium ternary compound fertilizer 20 to 30 kilograms, and then plowing, fine soil preparation, made 1.5 to 2 meters wide rake, irrigated, ready to broadcast.

Seeding

Early and late sowing time directly affects the size of the seedlings, which ultimately affects the yield of onions. In early sowing, the growth period of seedlings is prolonged, resulting in excessively large nutrient area, and seedlings are prone to convulsions; in late sowing, the seedlings are weak and the cold resistance is low, and dead seedlings are prone to overwintering. Therefore, to achieve high yields, you must master the best sowing time. According to the experience of local farmers, the most appropriate sowing date is appropriate 3 days before and after the white dew (in early September). The use of dry seeds sowing, covering fine soil after sowing, it is appropriate to not see the seeds. After covering the soil, 33% of the weeds per acre can be sprayed with 100 ml of spray to prevent weeds in the seedbed.

Management

After sowing, a layer of wheat straw shall be placed on the surface of the vine to facilitate moisturization, high temperature protection and protection against rain. The soil should be kept moist until it emerges. When about 60% of the seedlings on the seedling bed grow, the covering can be removed. According to weather conditions, timely watering, to prevent the seedbed from hardening, combined with watering topdressing a small amount of urea, through fertilizer and water regulation and cultivation of age seedlings. It is necessary to prevent the seedlings from growing too large, causing early convulsions, but also to avoid the delicate growth of seedlings, affecting the winter. Generally when onion seedlings grow to four true leaves, plant height 20 to 25 cm, leaf sheath diameter of 6 to 7 mm can be planted.

Planting clearance

Planting should be transplanted according to the size of onion seedlings so that their growth is consistent, and large seedlings with a sheath diameter of more than 8 mm and weak seedlings and diseased seedlings with a diameter of less than 3 mm are excluded. Colonization is generally completed from the end of October to the beginning of November, and requires the daily average temperature to be planted at 4°C to 5°C. Since it takes about 30 days for the onion to recover from colonization, it is imperative that the roots of the onion grow and develop well before the onset of cold, in order to prevent soil freezing and rooting and cause dead seedlings. Planting density requires a row spacing of 20 cm, a spacing of 15 cm, and the depth of planting is not to bury a pentageminal strand. After planting watering, to promote the survival of onion seedlings, avoid flood irrigation, resulting in soil compaction, is not conducive to rapid recovery of onion growth.

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