Liancon 8 onion pollution-free cultivation

Liancong No. 8 is the purple skin onion variety selected for the study of vegetables in Lianyungang City and is suitable for planting in Huanghuai area and similar climate areas. The variety is medium ripe, the whole growth period is about 250 days; the plant height is 65-75 cm; the bulb is oblate spherical; the epidermis is deep purple; the quality is crisp and the spicy taste is light; the average single ball weight is 250 grams, and the per mu yield is 5,000 kilograms; Resistance to purple spot and downy mildew. The seedlings were mixed with garden soil and decomposed organic fertilizer that had not been planted with onion and garlic crops within 3 years (organic fertilizer accounted for 30% to 40%) to prepare nursery soil. Carbendazim and thiram were used to disinfect bed soil, and phoxim was added to control the underground pests. The nursery will grow 10 to 15 meters wide and 1 to 1.5 meters wide. Sow on September 10-15, sowing before sowing 8 to 10 hours, sowing, with 150-200 grams of seed per acre field. After sowing, cover 1 cm thick fine soil, cover straw and shade net. Do not water before emergence. Remove 70% of the seedlings in the evening. When the seedlings are yellow and thin, 5 kg of urea per acre is applied in combination with irrigation. Spraying phoxim at the seedling stage controls tobacco budworms, and spraying streptomycin sulfate to control bacterial blight. In the past two years, the planting site has not been planted in the wetlands of the onion and garlic crops. Each mus of the decomposed organic fertilizer 4000 ~ 5000 kg, 50 kg of phosphorus and potassium fertilizer. After fertilizing, plunge 20 centimeters deep and make stilts 1.2 to 1.5 meters wide. Four to five days before colonization, soil closure was performed with trifluralin, and the mulching was applied after application. Seedlings have 3 to 4 true leaves when planting, spacing 15 cm, spacing 13 cm, planting 34000 per acre. The field management does not require the use of fertilizer before winter, and the frozen water is poured before the cold current. In the middle and late March of the following year, the onion seedlings returned to green when they were shallow and intensively cultivated, and combined irrigation with 20 kg of urea per acre. In early April, the growth of the leaves has entered a period of vigorous growth. At this time, a large amount of fertilizer is required. It is possible to apply 20 kg of urea and 20 kg of phosphorus-potassium compound fertilizer per mu. From late April to mid-May, the expansion of bulbs will increase the demand for phosphorus and potassium fertilizers, and 30 kg of phosphorus and potassium compound fertilizer can be applied per acre. Bulb expansion period can not be short of water, can be based on water conditions every 10 to 15 days irrigation water. Pest control Pest control Thrips, spraying with deltamethrin or fenvalerate. To prevent purple spot, spray with chlorothalonil or mancozeb. Against downy mildew, spraying with iprodione.