1953年河北省宣化县和万全县在玉米生产上普遍发生空秧(不结腰穗)现象,据9个村16户3个农场的调查,发生百分率差不多都在2%以上,一般为4—5%,最高者达22%,影响产量极大。究其原因,群众都说是种的越稠空秧越多;也有部分农民谈是正在玉米抽腰穗时(7月25日—8月10日).天旱没有抽 In 1953, the phenomenon of empty seedling (no knot of longevity) occurred in maize production in Xuanhua County and Wanquan County of Hebei Province. According to the survey of 3 farms in 16 households in 9 villages, the percentage of occurrence was almost 2% or more, usually 4- 5%, the highest of 22%, affecting the output of great. The reason, the masses are saying that the more the thicker empty seedlings more; there are some farmers talk about corn is pumping waist (July 25 -10 August). Drought did not pumping