洋葱（ＡｌｌｉｕｍｃｅｐａＬ．Ｏ）又叫团葱、圆葱、玉葱、葱头 ,是我省主要外销蔬菜种类之一。洋葱的小鳞茎栽培 ,是人为调整播种育苗时间 ,避开由于提前播种幼苗过大 ,在低温下易通过春化的特性 ,依据洋葱在高温长日照条件下无论植株大小都易形成鳞茎的特点 ,适当扩大苗床 Onion (AlliumcepaL.O) also known as green onion, onion, jade onion, onion, is one of the main export of vegetables in our province. Onion bulb cultivation is artificial sowing time to adjust the sowing, to avoid early because of sowing seedlings too large, easy to vernalized characteristics at low temperatures, according to the onion in high temperature and long day conditions regardless of the size of the plant are easy to form bulbs, Appropriate expansion of seedbed