2009年异常高温天气导致河南玉米大量分蘖,结合新品种鉴定筛选试验,调查30个品种在异常天气条件下的分蘖特性。结果表明,品种间分蘖率差异显著,先玉335的分蘖率最高,达74.91%;济单7号的分蘖率最低,为4.78%。整体上看,适宜高密度种植的品种分蘖率较高,适宜低密度种植的品种分蘖率较低,且低密度品种间分蘖率差异明显。 In 2009, unusually hot weather led to a large number of tillers in Henan corn, combined with the identification of new varieties of screening tests to investigate the 30 varieties in abnormal weather conditions, the tillering characteristics. The results showed that there was a significant difference in tillering rate among cultivars. The tillering rate of Xiangyu 335 was the highest, reaching 74.91%. The lowest tillering rate of Jiyang 7 was 4.78%. As a whole, the tillering rate of varieties suitable for high-density planting was higher, the tillering rate of varieties suitable for low-density planting was lower, and the tillering rate among low-density varieties was significantly different.