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Sowing seedlings Lianyungang area suitable sowing period is September 5 to 10 days. Before sowing, the garden soil and the decomposed organic fertilizer that had not been planted with scallions for three years were used to prepare the nursery soil. The amount of organic fertilizer accounted for 30% to 40%, and the carbendazim and thiram were used to disinfect the nursery soil. The seedbed is made into a sorghum with a width of 1 to 1.5 meters and a length of 10 to 15 meters. Diluted with 50% phoxim EC as bottom water to prevent underground pests. After soaking, the seeds were sowed, and 150-200 grams of seeds were needed per mu of field. After sowing, cover 1 cm thick fine soil, cover the straw, shade net and other coverings to shade and moisturize. No watering before emergence, 70% of seedlings unearthed when the cover was removed in the evening. When the seedlings are yellow and weak, 5 kg of urea per acre is applied in combination with irrigation. Note that 50% phoxim EC 800 times spray control of tobacco budworm, sprayed with 72% of agricultural streptomycin soluble powder 2000 times solution bacterial blight.
Proper colonization and selection of 2 to 3 years of non-vegetable planting of onions and garlic. The organic fertilizer is 4000-5000 kg per hectare of root-fertilizer, 30-40 kg of NPK fertilizer, deep-turned 20 cm, and leveled to be 1.2-1.5 meters wide. 4 to 5 days before planting, use 48% trifluralin cream 150 ml water spray to close the weeding, and then cover the mulch, press firmly around the membrane to prevent the wind from blowing. Seedling age 50 to 60 days, onion seedlings 3 to 4 leaf stage colonization, spacing 15 cm, spacing 12 cm, planting 28,000 to 30,000 per acre. After planting, we poured 1 big water.
The fertilizer and water management do not need to chase the quick-acting fertilizer before winter and seal the frozen water before the advent of the cold current. In winter, the soil is kept moist to prevent the seedlings from being dried and freezing. At the end of February and early March of the following year, when the onion seedlings return to green, 20 kg of urea are applied in combination with watering. During bulb expansion, 20 kg of urea and 45% of ternary compound fertilizer are applied per acre, and water is irrigated once every 10 to 15 days depending on soil moisture.
Prevention and control of pests The major pests and diseases of onions are thrips, purple spot and downy mildew. Use 25% deltamethrin EC or 20% speed killing chlorinated oil 2000 times spray to control onion thrips; use 75% chlorothalonil wettable powder 600 times or 70% mancozeb wettable powder 500 times Spray to prevent purple spot; use 50% acetaminophen WP 1000 times spray to prevent downy mildew, spray once every 7 to 10 days, continuous control 2 to 3 times.
Water harvesting was controlled 2 weeks before harvesting. When the tubular leaves have not yet yellowed, the onion leaves are sprayed with a solution of fresh green pigment at a concentration of 2.5 g/liter, and 120 kg per mu of spray liquid is used to prevent germination during storage. After the natural lodging of the tubular leaves, they were harvested on sunny days 5 to 7 days. The onion balls will be pulled up and placed on the surface to dry for 1 to 2 days. After the pseudo-stem becomes soft, it will be cut off by 2 to 3 cm. Outdoors are piled up in tents, turned during the storage period 2 or 3 times, and the bad balls are removed.
Cultivation of extremely early-ripening onion liancong 5
Liancong 5 is a very early-maturing onion variety selected from the vegetables research in Lianyungang City. The plant height 60-70 cm, very early maturity, about 220 days of the whole growth period; average ball weight 150 grams or more, about 4500 kilograms per mu; skin yellow, scales white, spicy tasteless, sweet taste; Resist purple spot.