以连续4 a的春玉米生育期调查数据和气象资料为基础资料,对表达玉米熟期类型的指标及其关系进行了分析和研究。结果表明:活动积温、生育天数和叶片数三者之间呈极显著正相关,活动积温和生育期天数能较准确地表达玉米熟期类型,叶片数只可作为辅助指标。通过聚类分析,将73个玉米品种分为10类熟期类型;并以此为基础科学推断划分春玉米熟期类型为12类,明确了各熟期类型的活动积温及生育天数指标。 Based on the survey data and meteorological data of 4 years of spring maize growth period, the indicators of maize ripening period and its relationship were analyzed and studied. The results showed that there were extremely significant positive correlations between activity accumulated temperature, days of birth and leaf number, and the activity accumulated temperature and the number of days of growth period could express corn ripening period more accurately. The number of leaves could only serve as an auxiliary index. According to the cluster analysis, 73 maize varieties were divided into 10 types of maturity types. Based on this, the maturity types of spring maize were divided into 12 categories, and the indicators of accumulated temperature and days of fertility were defined.