The onion is a 2-3 year old herb belonging to the genus Liliaceae, which is planted in vast areas of China. In the winter in North China and Northeast China, the onion seedlings cultivated on the open ground still cannot survive winters in situ. Therefore, in north China and northeast China, autumn sowing is often used, winter is planted in winter, planted in the following spring, and bulbs are harvested in summer. How to make the onion seedlings winter normally is the key to winning the high yield in the following year. The onion wintering techniques are described as follows: The onion seedlings shall be planted in mid-November each year (the second half of the Lunar Winter Festival) and the land will 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), shake gently, shake off the floating soil, and remove the shootless seedlings, seedlings with no roots, no growth points, short, slender seedlings, and long leaves. Injury seedlings and pests, and onion sprouts (scallion seedlings part of the erect growth; leaf base cross section is round: the onion seedlings sheath part of the erect slightly curved, the base of the leaf blade is concave). In order to facilitate management, onion seedlings should be graded and implanted. The grading standards are: first-stage seedlings, small bulbs 0.6-0.7 cm, leaves 3-4 pieces; secondary seedlings, small bulbs 0.4-0.6 cm, and 3 leaves. Edge bales are bundled into 80-100 bales, which are sorted and graded. A seedling was planted in Yangshuo. Yangshuo should choose to lay a layer of dry sand with a thickness of about 5 cm behind the wind barrier or other leeward shades, and then stack 5-7 cm high small ridges on the dry sand on one side of the raft. A row of bales of a seedling will be placed side by side in a row, placed in a row, 5-7 cm in the root of the seedlings, and then a straw with a diameter of 2-3 cm will be placed on the clay. Two rows of seedlings before and after the interval. After all the implants are planted, soil shall be used to block the area around the concrete, so as 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 5-10 cm east-west trenches, 3-5 meters long, 25-30 centimeters wide, 15-20 centimeters deep, after the bundle of seedlings tilted 45 degrees to the south In the trench, the top of the soil is covered with alum. After all the plants were erected, wind barriers were set around them to make the seedlings leeward and cloudy. The wind barriers were tightly sealed with soil and protected from wind and rain. The leaves of young seedlings planted in this way will grow slowly, and in the case of continuous decline in the outside temperature in Northeast China, they should be covered with batches of soil or covered with crop stalks against cold in accordance with the weather conditions. Usually pay attention to the weather forecast. Cover the seedlings with plastic film before cloudy snow. Remove the thin film and clean the surrounding snow after snow to prevent the snow from entering the inside of the urn and the ditch. 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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