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种子外部生态条件是种子萌发的前提，但不少活力正常的蔬菜种子在适宜的生态条件下并不能迅速、正常地发芽，其主要原因就是种子休眠。引起种子休眠的原因很多，有的是因为种子收获时胚的发育尚未完成；有的是因为还没有渡过后熟阶段；有的是因为种皮“硬实”或种皮的附属物影
Seed external ecological conditions are the prerequisite for seed germination, but many of the vitality of normal vegetable seeds in the appropriate ecological conditions and can not quickly and normally germinate, the main reason is the seed dormancy. There are many reasons for seed dormancy, some because embryo development has not been completed when the seeds are harvested; some because they have not yet passed through the ripening stage; some are due to the “hard” seed coat or the shadow of the seed coat