How to cultivate onion for high yield
First, the selected land plot is flat and well-watered, with a groundwater content of 0.2% or less, a neutral soil and high fertility, and a sandy loam soil that does not weigh heavily.
Second, select the varieties used in the United States to improve the 502 round onion varieties.
Third, nursery 1. The time is generally suitable for seedlings before and after 1-2 days. Precocious convulsions tend to occur prematurely, and production decreases when they are too late. 2. After planting the whole plant, fill enough water. After the water seepage, mix the seeds and fine sandy soil in a ratio of 1:10 for sowing. Cover the fine soil after sowing. The soil thickness should be about 1cm. After the soil is covered, apply phoxim granules for prevention. Underground pests. The amount of seeds used for seedbeds is 2 kg/mu and about 25,000 seedlings emerge. 3. Miao Miao seedlings 4-5 cm high when the seedlings, keeping the seedlings from 3-4 cm.
Fourth, colonization 1. Time is generally appropriate in the late October (frost) before and after planting. 2. Soil preparation Mushi 5,000 kg of organic fertilizer, 50 kg of DAP, 50 kg of superphosphate, deep-flip 30 cm after fertilization, combined with soil spray fluocin EC to control weeds, and phoxim granules to control underground pests . 3. Choose seedlings with a height of about 20-25 cm, a stem diameter of 0.6-0.9 cm (not more than 1 cm), and seedlings with 4-5 leaves. Seedlings are too large and can easily cause bolting and flowering. When the seedlings are too small, they can easily freeze to death when they pass winter. 4. The density is 20 centimeters apart, and 22,000 planted seedlings are 15 centimeters in the sea. 5. Depth to bury 1 cm of bulb, and it is advisable not to float after watering.
5. Immediately after the planting, the planting water shall be watered immediately after the planting. After the water seeps, the cultivator shall be cultivated in time. Pour frozen water (in mid-November) before freezing and cover the mulch. Do a good job of film protection in winter and found that the hole was blocked in time and strictly prevented freezing seedlings.
VI. Spring Management 1. After the membrane is returned to seedlings in spring, the seedlings shall be released from the membrane in time, and the seedlings shall be placed in the wet soil immediately after the seedlings are released to prevent evaporation of water under the membrane. 2. Water and Fertilizer Management After returning to green for 30 days, conduct fertilizer and water management, and always keep the ground moist and dry. Until the harvest is about 4-5 times watering, every time you water it must be topdressing. 3. Pest control uses 40% dimethoate EC 800 times to control submerged leaf insect pests, and control the onion purple spot with a multiple amount of Bordeaux mixture, and use 60% diethylaluminophosphate 500 times solution plus a spreader to prevent downy mildew.
Seventh, timely harvest 15 days before maturity, spray 400 times Qingxin, prevent storage period germination. Stop watering 10 days before maturity to prevent post-harvest rot. When the plants fall down and the bottom 3-4 old leaves turn yellow, the sign onion has matured and is harvested on sunny days.
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