甘蓝属于绿体春化型作物,当幼苗长到7片真叶左右、叶宽5厘米以上、茎粗0.6厘米左右时,遇到0～15℃的低温条件下,经过50～90天就能通过春化阶段发生“未熟抽薹”。苗龄愈大,低温时间愈长,完成速度就愈快。特别是在2～5℃的条件下,更容易通过春化阶段而发生“未熟抽薹”。其发生原因与品种特性、播种期、苗期管理、定植期及气候条件密切相关。 1.与品种的冬性强弱有关系 冬性弱的品种如“迎春”、“北京早熟”等易发生“未熟抽薹”;而冬性强的品种如“中甘11号、中甘12号”等则不易发生。但 Cabbage is a green vernalization crop, when the seedlings grow to about 7 true leaves, leaf width 5 cm or more, about 0.6 cm in stem diameter, encountered 0 ~ 15 ℃ under low temperature conditions, after 50 to 90 days can Through the vernalization stage “immature bolting.” Larger seedling age, the longer the low temperature, the faster the completion rate. Especially under the conditions of 2 ~ 5 ℃, it is easier to “immature bolting” through the vernalization stage. The causes are closely related to variety characteristics, sowing date, seedling management, colonization period and climatic conditions. 1 and winter varieties have a strong relationship between winter weak varieties such as “Spring”, “Beijing precocious” and other prone to “not ripe bolting”; and winter strong varieties such as “Zhong Gan 11, Zhong Gan 12 ”And so is not easy to happen. but