First, nurture strong seedlings. It is generally better to plant seedlings from the end of September to mid-October. Nursery sites should be selected for loose fertility, convenient drainage and irrigation, and no sand or loam grown in onions or garlic. Before sowing, it is necessary to finely prepare the soil, apply enough base fertilizer, and start seeding. Before sowing, it should be soaked in warm water for 24 hours, dried and mixed with dry soil. Seed 70-75 grams per acre sowing seedbed, covered with fine soil after sowing, and then covered with weeds, anti-rain wash and direct sunlight. After covering the grass, apply sparse manure water and sprinkle insect repellent drugs around the gills. After the seedlings are unearthed, cover the weeds. During the nursery period, every 5-6 days, leaching and decomposing manure water once, about 40 days at the seedling stage can be transplanted.
Second, choose fertilization. Onion should not be used as a continuum, planting areas should be selected before the planting of soy fruit, melon beans, rice base in late season, especially in the more fertile sandy loam or new planting land is better.
Before the planting, 25 kg of lime per acre was used for soil disinfection, and 1500-2000 kg of high-quality soil-fertilizer was used as a base fertilizer. The planting of medlars is 80-100 cm wide and 25-30 cm in height. The surface layer of the mulberry must be loose, finely crushed, and smooth.
Third, scientific colonization. The planting is usually done from mid-November to early December, so that the seedlings will grow rapidly before the “cold†and will not suffer freezing injury.
Planting specifications are: plant spacing 10-12 cm, spacing 14-16 cm, planting depth 2-3 cm, planting about 8000 per acre. After the planting, the water is set to root to facilitate survival.
Fourth, timely fertilizer. 7 days after transplanting, apply a thin manure dung water, and then apply fire soil or high-quality soil manure every 7-8 days to promote hair roots and enhance cold resistance.
During the cold season, onion seedlings grow more slowly and can be topped up. In late February of the following year, when bulbs enter the expansion stage, fertilizer should be applied 1-2 times, and 10-12 kg of urea and 5-6 kg of potassium sulfate should be applied per mu.
In late March, the bulbs rapidly expanded, and 1250 kilograms of human excrement per acre was reprocessed. Fertilization was stopped 25 days before harvest.
Fifth, a reasonable watering. Onion and hi wet and avoid stains. In the early stage, the seedlings were small, the temperature was low, the water requirement was less, and the soil was kept moist.
After the spring season, the temperature is getting higher, the onion growth rate is accelerated, and the bulbs are formed in large quantities and enter the expansion period. The demand for water is more and more water is needed. However, when there is a lot of rain in the spring, drainage should be drained in time to prevent the accumulation of water in the field.
Watering was stopped 10 days before harvest to facilitate harvesting and to avoid high moisture content in the bulbs and resistance to storage.
Six, prevention and treatment of diseases. The common onion diseases are soft rot and stalk rot.
(1) Apply ripened fertilizer to prevent the spread of fertilizer. During the growth period, the amount of nitrogen fertilizer was controlled, and nitrogen, phosphorus, and potassium were required for fertilization. (2) Pay attention to timely drainage during bulb formation and avoid long-term accumulation of water. (3) The following agents were used before onset: 72% of agricultural streptomycin 4000 times and 405 Fuxing Emulsion 8000 times were alternately sprayed.
Seven, timely harvest. When the leaves of plants gradually turn yellow and the base leaves begin to dry, the onion has stopped growing and it should be harvested in time. Harvest the onion seedlings as much as possible to avoid damage to onion heads for storage and transportation.
Second, choose fertilization. Onion should not be used as a continuum, planting areas should be selected before the planting of soy fruit, melon beans, rice base in late season, especially in the more fertile sandy loam or new planting land is better.
Before the planting, 25 kg of lime per acre was used for soil disinfection, and 1500-2000 kg of high-quality soil-fertilizer was used as a base fertilizer. The planting of medlars is 80-100 cm wide and 25-30 cm in height. The surface layer of the mulberry must be loose, finely crushed, and smooth.
Third, scientific colonization. The planting is usually done from mid-November to early December, so that the seedlings will grow rapidly before the “cold†and will not suffer freezing injury.
Planting specifications are: plant spacing 10-12 cm, spacing 14-16 cm, planting depth 2-3 cm, planting about 8000 per acre. After the planting, the water is set to root to facilitate survival.
Fourth, timely fertilizer. 7 days after transplanting, apply a thin manure dung water, and then apply fire soil or high-quality soil manure every 7-8 days to promote hair roots and enhance cold resistance.
During the cold season, onion seedlings grow more slowly and can be topped up. In late February of the following year, when bulbs enter the expansion stage, fertilizer should be applied 1-2 times, and 10-12 kg of urea and 5-6 kg of potassium sulfate should be applied per mu.
In late March, the bulbs rapidly expanded, and 1250 kilograms of human excrement per acre was reprocessed. Fertilization was stopped 25 days before harvest.
Fifth, a reasonable watering. Onion and hi wet and avoid stains. In the early stage, the seedlings were small, the temperature was low, the water requirement was less, and the soil was kept moist.
After the spring season, the temperature is getting higher, the onion growth rate is accelerated, and the bulbs are formed in large quantities and enter the expansion period. The demand for water is more and more water is needed. However, when there is a lot of rain in the spring, drainage should be drained in time to prevent the accumulation of water in the field.
Watering was stopped 10 days before harvest to facilitate harvesting and to avoid high moisture content in the bulbs and resistance to storage.
Six, prevention and treatment of diseases. The common onion diseases are soft rot and stalk rot.
(1) Apply ripened fertilizer to prevent the spread of fertilizer. During the growth period, the amount of nitrogen fertilizer was controlled, and nitrogen, phosphorus, and potassium were required for fertilization. (2) Pay attention to timely drainage during bulb formation and avoid long-term accumulation of water. (3) The following agents were used before onset: 72% of agricultural streptomycin 4000 times and 405 Fuxing Emulsion 8000 times were alternately sprayed.
Seven, timely harvest. When the leaves of plants gradually turn yellow and the base leaves begin to dry, the onion has stopped growing and it should be harvested in time. Harvest the onion seedlings as much as possible to avoid damage to onion heads for storage and transportation.
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