After the onion is harvested in the summer, it enters a dormant period. The general dormancy period is 1.5 to 2.5 months. After the dormancy period, the onion can continue to be dormant using the low-temperature drying conditions, that is, it is in a forced dormancy period. Onion storage temperature is 3 ~ O °C, relative humidity less than 80%. Humidity is perishable, and it also causes rooting and germination. Common storage methods are: (1) Indoor storage method. Choose high-drying, ventilated shady places, with sleepers, straw and other materials bedding, the sun will be staggered on top of the stings, paving the middle slightly higher rectangular crucible. Cover a few tiers of oysters to prevent rain from pouring out and keep the moromi dry. Pour it 1 or 2 times before entering winter and then transfer it into the room after entering winter. The temperature is controlled between 0 and 3°C. When the temperature is high, the door can be ventilated and cooled. Below the proper temperature, coverage should be increased to keep it warm and cold. (2) basket method. After the onion closes, selenium is dried. After the leaves turn yellow, they are bundled into small rounds. The onion heads outwards, and the leaves are inwards. The hollow cones are formed inside. Every 4 to 5 days, it should be poured once. Avoid rain. After the onion has dried, remove the leaf and put it in a basket or box. Each basket is 20 to 30 kilograms, stacked in a pit or in an ordinary warehouse. (3) Mud storage method. Infuse the bumpy onions in a mud ball, dry them, place them in a stack or place them in a dry place. Or make a 36mm long, 21cm wide, and 6cm high billet from wooden planks. Then mix the sand with the mud, cut the onion off the stems and leaves, and mix it with the mud to form a adobe. The method is to lay a layer of mud on the bottom of the mold, put a layer of onion on the mud, and then cover with a layer of mud. So adobe into a adobe, after full drying, release the indoor storage. (4) Hanging law. The sun-dried onions were braided into braids, each about 1 meter long, and the two were tied together, each hanging about 80 to 100 heads. Keep the prepared onion hung on the shelf and let the scorpion leave the ground for 10 centimeters. Surround it with a mat and watch out for rain. After winter, it can be stored indoors or in storage. (5) Maleic hydrazide treatment. Onions 10 to 15 days before harvest, 0.2% to 0.25% maleic hydrazide sprayed in the field, 50 kg per acre, 3 to 5 days before spraying to stop watering, spraying in case of rain within 1 day after spraying cloth. Can inhibit onion respiration during storage and delay germination.
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