洋葱又称葱头、圆葱,是一种世界性蔬菜,原产中亚、西亚,以其膨大的鳞茎为产品。然而洋葱在鳞茎膨大前有时会过早抽薹,在栽培学上称为先期抽薹,不仅使洋葱的产量下降而且严重影响其产品质量及耐贮性,是洋葱生产的大忌。洋葱属于绿体春化作物,通过春化阶段的条件有三:一是幼苗必 Onions, also known as onion, onion, is a worldwide vegetable, originating in Central Asia, West Asia, with its bulky bulbs for the product. However, the onion bulbs prematurely bulging bulbs sometimes premature, known in the cultivation of pre-bolting, not only to reduce the production of onions and seriously affect the quality of their products and storage, is the taboo onions production. Onions belong to the vernalization of green crops, there are three conditions through the vernalization stage: First, seedlings must