洋葱,又名圆葱、葱头,属百合科葱属,二年生草本植物。在世界各地的栽培面积仅次于马铃薯和番茄,名列第三位。20世纪初传入中国,在我国南北方均有较大的种植面积。洋葱营养价值极高,肥大的鳞茎中蛋白质、维生素、铁、磷、硫等含量都很丰富。洋葱的总糖量占干重的50％-78％,含氮物质6.25％-13.8％,含有18种氨基酸,维生素A高达5000国际单位,每百 Onion, also known as onion, onion, is a liliaceae Allium, biennial herbs. Third only to potatoes and tomatoes in all parts of the world. Introduced to China in the early 20th century, both in northern and southern China have larger planting areas. High nutritional value of onion, bulky bulbs protein, vitamins, iron, phosphorus, sulfur and other content is very rich. Onion’s total sugar content of 50% -78% of dry weight, nitrogenous substances 6.25% -13.8%, contains 18 kinds of amino acids, vitamin A up to 5000 International Units, each hundred