甘薯芽苗在苗床常发生不定根即所谓气生根,这是在育苗过程中管理不善,遇高温高湿,由薯苗沙面以上叶柄基部的根原基发育而成的。据三年来的13处试验证明;有气生根的壮苗比无气生根的壮苗,每亩减产鲜薯381—805斤,减产6.1—14.9%。因此,研究气生根造成减产的原因和培育无气生根壮苗的措施,是夺取甘薯高产稳产的重要问题。为此我们于1979—1981年对甘薯幼根进 Sweet potato sprouts often occur in the seedbed adventitious root is the so-called aerial root, which is poor management in the nursery process, the case of high temperature and humidity, from the seedling sand above the petiole base of the root primordia development. According to the three experiments over the past three years, it shows that the strong seedlings with aerial roots have stronger seedlings than the non-rooted ones. The output of fresh potatoes per mu is 381-805 kg, a decrease of 6.1-14.9%. Therefore, the study of the reasons for reduced production of aerial root and the measures to cultivate aerial strong rooted seedling are the important issues to seize the high and stable yield of sweet potato. To this end we in 1979-1981 sweet potato root into