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运用群体生育型特征与演化的观点，分析了冀、鲁、豫夏玉米区玉米杂交种群体生育型演化进程至端的第Ⅳ演化阶段群体生育型基本特征与演化特征及其演进趋向，结果表明，第Ⅳ演化阶段群体生育型基本特征表现为株型紧凑或半紧凑，穗位叶适中，雄穗分枝较少，抗倒性和抗斑性优良，籽粒长，出籽率高；其演化特征主要由穗粒结构与第一叶面积、生育日数决定，其穗长演化将趋于稳态，穗行数、穗粗、百粒重、行粒数与第一叶面积、株高将呈现较明显的持续演进态势，其中生育日数、行粒数和株高将分别向早熟、多粒和高棵方向回归。第Ⅳ演化阶段群体生育型演进临近转型期。
Based on the characteristics and evolution of population fertility, this paper analyzed the basic characteristics and evolution characteristics of population fertility at the stage of evolution of the maize hybrid population in Hebei, Luzhou and Yuxia summer maize. The results showed that, In the fourth stage of evolution, the basic characteristics of population fertility were as follows: the plant type was compact or semi-compact, the ear position was moderate, the tassel branch was less, the lodging resistance and anti-spot were superior, the grain length was longer and the seed yield was higher; Mainly by the spike grain structure and the first leaf area, the number of birth days, the ear length evolution will tend to steady state, ear number, ear diameter, 100 grain weight, line grain number and the first leaf area, plant height will show more Significant sustainable development trend, of which the number of birth days, grain number and plant height will be premature, more grain and high return to the direction of the tree. The Evolution of Group Fertility in the Fourth Stage of Evolution is in the Transitional Period.