Cultivate strong seedlings 1. Seedlings of the standard The seedlings are generally required to be 18 cm to 24 cm in height when transplanted, with 3 to 4 leaves, with a stem diameter between 0.5 cm and 0.8 cm, and a seedling age of 40 days to 50 days. 2. The nursery time is generally appropriate in mid-March, with high premature costs and easy convulsions. 3. Seedbed preparation to choose soil loose fertility, water retention, fertility and strong performance of the plot, the general per square meter seedbed Diammonium Phosphate 0.1 kg, 0.1 kg of potassium sulfate, applied into the plough layer 15 cm to 20 cm, seedbed width 120 About centimeters, the required seedbed area per mu is from 2 to 3 square meters and 8 to 10 kg of nutrient soil per square meter is prepared. 4. Preparation of nutritious soil Decomposed organic fertilizer, sandy loam soil, fertile garden soil (1:2:3), nutrient soil must be sieved and selected. 5. Variety selection: Mid-late-maturing high-yield American onion-W-2 and Japan white-picked hybrid, long day white onion. 6. Seeding method and seeding rate Pre-planting seedbed fine leveling, pouring foot bottom water, and then evenly sowing seeds, the amount per mu is between 4 kg and 5 kg, and then cover 1 cm thick nutrient soil, every 10 kg Nutrition soil plus carbendazim 10 grams, 20 grams of trichlorfon. 7. Germination period from the seed germination to the first true leaf appears as the onion germination period, about 15 days; germination temperature of about 20 °C, sowing should not be too deep, the cover soil can not be too thick, keep the soil moist before the seedlings excavated, prevent soil harden. 8. Seedling stage from the first true leaf emergence to planting seedling stage, spring planting spring seedling period of about 40 days to 60 days, seedling growth suitable temperature is 12 °C to 20 °C. After slow rooting and hair rooting, it has entered the vigorous growth period and then entered the early stage of bulb expansion. The suitable temperature is 20°C to 26°C. 9. The temperature of the nursery management shed exceeds 30°C. Pay attention to letting the air cool. After Miao Qi chases a fertilizer, apply 15 grams of urea per square meter and add 15 kilograms of water. After that, depending on the seedling quality, the seedling will be hand-planted in time, and the plant spacing 1 cm to 1.5 cm. Planting and Transplanting 1. Field preparation: Select plots, convenient irrigation, and better land plots. Apply 3 tons of organic fertilizer to 5 tons per kilogram, about 30 kilograms of potash, 20 kg to 30 kg of diammonium phosphate, and 10 kg of urea. Deep plowing, smashing, and smashing are all based on the principle that no water accumulates in the pot. 2. Transplanting time is generally transplanted around the beginning of May. 3. Ditching and laying the film The trenching machine can be used to complete the trenching and filming at one time, and can also be first used for mechanical trenching and then manually leveled. The artificial film is made of ultra-thin film with a width of 1.2 meters or 1.4 meters and a thickness of 0.008 mm. Ditch straight, smooth film formation. Per Mu 26,000 seedlings to 28000 or so, seedlings in the planting soil should be planted, after planting a planting, planting water in a timely manner. After 5 days of colonization, the seedlings were checked and watered with seedlings. Field Management 1. Watering after planting should be promptly watered in order to ease the seedlings. After entering the peak period of hair growth, watering should be properly strengthened. After the bulbs are expanded, the seedlings are watered 10 to 15 days before watering, which promotes the transition from the growth of the onions from the leaves to the enlargement of the bulbs. 2. Seedlings should be diligently watered to keep the soil moist and stop watering for 10 to 15 days before harvesting.
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