大白菜历来都是秋种秋收。它的特性是不耐炎热,也不抗严寒,喜欢凉爽的气候。生长前期,需要较高的温度,以利于根系的发育和植株的生长;后期,需要较低的温度,以利于养分的积累和叶球的形成。如果苗期通过10℃以下低温20天左右,结球期遇25℃以上的高温,则包心不紧实,甚至抽苔开花,不能形成叶球。大白菜如果春种,春 Chinese cabbage has always been autumn harvest. Its characteristics are intolerant of heat, nor anti-cold, like the cool climate. Early growth, the need for higher temperatures in order to facilitate the development of roots and plant growth; later, the need for lower temperatures in order to facilitate the accumulation of nutrients and the formation of leaf balls. If the seedling through the following 10 degrees Celsius for about 20 days, the junction of the case of 25 degrees Celsius and above the high temperature, the pack is not tight, and even bolting flowering, can not form a leaf ball. Chinese cabbage if spring species, spring