How to make the onion seedlings winter normally is the key to achieving high yields in the following year. The onion false wintering technique is introduced as follows:
The onion seedlings shall be planted in mid-November each year (after the winter lunar winter festival) and the land shall be frozen immediately before freezing. You must not water it in the fields within 10 days before the implant.
Before the planting, the seedlings are shoveled out of the field (as far as possible without damaging the root system), trembling gently, shaking off the floating soil, and removing the shootless seedlings, seedlings with no roots, no growth points, short, slender seedlings, and long leaves. Injury seedlings and diseases, and onion seedlings (scallion seedlings part of the upright growth; leaf base cross section is round: the onion seedlings sheath part of the upright slightly tortuous, leaf base transverse section is concave). For the convenience of management, onion seedlings should be graded and planted. The grading standards are: first-class seedlings, small bulbs 0.6-0.7 cm, 3-4 leaf blades; secondary seedlings, small bulbs 0.4-0.6 cm, and 3 leaf blades. Edge-graded and tied into 80 to 100 trees as a bundle of bales, bundled and graded after planting.
A seedling was planted in Yangshuo. Yangshuo should choose to lay a layer of dry sand about 5 centimeters thick behind the wind barrier or at the back of the lee, and then pile up 5 to 7 centimeters of small ridges on the dry sandy soil on one side of the raft. A row of bales of a seedling is placed side by side in a row, placed in a row, and then soiled at the root of the seedlings by 5 to 7 centimeters. After that, straws of 2 to 3 centimeters in diameter are placed on the soil. Before and after the two rows of seedlings. After the whole planting, the earth shall be closed tightly and tightly with earth to prevent wind and water penetration.
Secondary seedlings are planted in cold ditch. To prevent flooding, the cold-proof ditch should be selected at a higher elevation. The specific method is: a number of 5 to 10 cm intervals east-west ditching, ditch length 3 to 5 meters, width 25 to 30 cm, depth 15 to 20 cm, the bundle of seedlings tilted 45 degrees to the south side placed In the trench, the top of the soil is covered with alum. After the whole plantation, a wind barrier was set around the plant to make the seedlings leeward and shaded. The outside of the wind barrier was tightly sealed with soil and protected against wind and rain. Seedlings planted in this way will have slow growth. In the case of a drop in the outside temperature, the soil should be re-applied in batches or covered with straw to prevent cold in accordance with weather conditions.
Usually pay attention to weather forecast. Before the snow is over, the seedlings should be covered with plastic film. After the snow is removed, the film should be promptly removed and the surrounding snow should be cleaned to prevent the snow from entering the inside of the urn and the ditch and causing rancidity.
Using the above methods, onion seedlings can be safely overwintered until they are planted in the field in early March of the following year.
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