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选用假茎粗短、可溶性固形物含量高的品种,在下霜后,管状叶由厚变薄,呈现半枯黄状态时采收。低温贮藏的适宜温度为0℃,微冻贮藏的适宜温度为-5～-3℃。冬贮干葱适宜空气相对湿度65%～70%,青葱适宜空气相对湿度95%～100%。适宜氧含量为1%,二氧化碳为5%。
Selection of short pseudostems, soluble solids content of high varieties, after the cream, the tubular leaves from thick to thin, semi-yellow state when the harvest. The optimum temperature for cold storage is 0 ℃, and the suitable temperature for frozen storage is -5 ~ -3 ℃. Winter storage dry onions suitable for air relative humidity 65% to 70%, green suitable for air relative humidity 95% to 100%. Suitable oxygen content of 1%, carbon dioxide is 5%.