High-yield onion cultivation technology
First, select plots
Select land plots with flat terrain, good irrigated conditions, groundwater salt content below 0.2%, neutral soil, high fertility, sandy soil and no heavy soil.
Second, select varieties
US modified 502 round onion varieties were selected.
Third, nursery
1. Time. Generally, it is most suitable to grow seedlings before and after 1-2 days. Precocious convulsions tend to occur prematurely, and production decreases when they are too late.
2. Sow. After the whole planting, fill the water. After the water seepage, mix the seeds and fine sandy soil in a ratio of 1:10 to spread the seeds. After sowing, cover the fine soil and the soil thickness is about 1cm. After covering the soil, apply phoxim granules to prevent the underground pests. The amount of seeds used for seedbeds is 2 kg/mu and 25,000 seedlings are planted.
3. Saplings. When the seedling height is 4-5 cm, the seedlings are planted and the seedlings are kept at a distance of 3-4 cm.
Fourth, colonization
1. Time. It is generally appropriate to plant colonies before and after the frost fall in late October.
2. Site preparation. Mu Shi decomposed organic fertilizer 5000 kg, 50 kg of diammonium phosphate, 50 kg of superphosphate, deep-flip 30 cm after fertilization, combined with site preparation spray Fluorine EC to control weeds, and phlogoxin granules to control underground pests.
3. Choose seedlings. Seedlings 20-25 cm tall, 0.6-0.9 cm thick (not more than 1 cm), 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. Density. Row spacing 20 cm, spacing 15 cm, planting 22,000 per mu.
5. Depth. It is advisable to bury the bulbs 1 cm, and do not float them after watering.
V. Management after planting until returning green
Watering immediately after planting, and cultivating in time after water infiltration. 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.
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