洋葱的结球性与日照长短、温度高低有密切关系,台湾适合短日性品种,目前台湾推广的洋葱品种均以适合外销市场为前提,以适应当地栽培环境为重点,主要推广的品种有如下七个:早玉(Texas Early Grano502):该品种为早熟性品种,株形较高大,葱球大形,近于球形,但肩部平广,底部稍尖,皮 Onion ball and sunshine duration, the temperature is closely related to Taiwan for short-term varieties, the current promotion of onion varieties in Taiwan are suitable for export markets as the prerequisite to adapt to the local culture environment as the focus, the main varieties are as follows Seven: Early Texas (Texas Early Grano502): This variety is a precocious species, tall plant shape, large bulb onion, nearly spherical, but broad shoulders, slightly pointed at the bottom of the skin