我们在总结天津郊区贫下中农栽培青麻叶大白菜的实践经验中,发现大白菜的营养生长过程,和以往一些书刊中的看法有不尽一致的地方,下面提出几点商讨性的意见。一山东农学院主编的《蔬菜栽培学》中卷(以下简称中卷)中说:发芽期是从“子叶出土并完全展开,开始出现第一对真叶,到7—8日第一对真叶完全展开并达到和子叶相等的大小(拉十字)……在这一时期中,为胚生长成幼芽的过程,主要利用种子贮藏的养分 In summing up the practical experience of cultivation of Chinese greenpea Chinese cabbage in the suburbs of Tianjin, we found that the vegetative growth of Chinese cabbage is inconsistent with that of some books and periodicals. Here are some suggestions for discussion. Shandong Agricultural College editor of “Vegetable Cultivation” in the volume (hereinafter referred to as the volume) said: germination period is "cotyledons unearthed and fully expanded, began to appear the first pair of true leaves, to 7-8 on the first true The leaves are fully unfolded and reach the same size as the cotyledons (pull the cross) ... During this period, the embryo grows into young shoots that mainly utilize the nutrients stored in the seed