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以寿阳县为代表的山西省中部高海拔地区，旱地玉米是主要的粮食作物。使用适宜熟期类型的品种，是种植成败的关键。因种植地域的差异，所用玉米杂交种的熟期类型在中早熟至中晚熟范围内变动，个别地区也能使用早熟类型。如何准确地掌握所用品种的熟期类型，必须选好划分指标。多年试验研究表明，植株叶数、播种至成熟天数、播种至成熟生育期内≥０℃的积温是熟期分类的形态指标、生育指标和生态指标，而植株叶数是最易识别和掌握的指标。
As the representative of Shouyang County, central Shanxi Province at high altitude, dryland corn is the main food crops. The use of suitable maturity varieties is the key to success of planting. Due to the differences in planting areas, the maturity types of maize hybrids used vary from mid-early maturity to middle-late maturity, and precocious types can be used in some areas. How to accurately grasp the maturity of the types of varieties used, we must choose a good division of indicators. Many years of experimental studies have shown that the accumulated leaf temperature from sowing to mature days and sowing to ≥0 ℃ during the maturity stage is the morphological, reproductive and ecological indicators of the maturity stage, while the leaf number of the plant is the most easily identified and mastered index.