洋葱具有产量高、品质优、耐贮运等特点,是出口创汇的主要蔬菜品种,但是在实际生产中,往往由于秋播过早,肥水管理不当,使苗期营养生长过旺,秧苗在低温季节发棵过大,造成洋葱在鳞茎形成前过早抽薹,导致洋葱产量降低、品质变劣、商品性下降,所以在生产中应采取有效措施避免洋葱先期抽薹的发生。 Onion has the characteristics of high yield, good quality, storage and transportation, etc. It is the main vegetable variety of export earning foreign exchange. However, in actual production, the improper management of fertilizer and water usually leads to over vegetative growth at seedling stage, If the season is too big, the onions will be prematurely bolted before the bulbs are formed, resulting in the decrease of the onion production, the deterioration of quality and the decrease of the commercial properties. Therefore, effective measures should be taken in the production to avoid the early bolting of onion.