我省生产上应用的“胜利百号”地瓜品种,近几年来,日趋退化,薯蔓变细变长,品质变劣,产量下降。据调查长蔓型(退化的)“胜利百号”比短蔓型一般减产20%左右。兴城县白塔公社采用田间选薯留种的方法复 In the past few years, the “Shengli No. 100” sweet potato varieties used in production in our province have become increasingly degraded. The potato varieties have become thinner and longer, their quality deteriorated, and the output decreased. According to the survey, the Manchu (degraded) “Victory 100” generally cut about 20% of the total output of the short-braid. Xingcheng Baita commune to adopt the method of selection of potatoes seedling complex