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以近年北方春、夏玉米主产区，几个主要推广夏玉米品种的性状平均表现和当前的育种目标为基础，制订了夏玉米主要性状的分级标准。按此标准利用改进列联表法的计算程序，对本生态区1991～1995年5a的资料进行统计分析，建立了一套夏玉米组合综合评价的数量化模式。该方法在玉米育种实践中具有良好的可用性。
Based on the average performance of some main popularized summer maize varieties and the current breeding objectives in recent years, the main spring and summer maize producing areas in northern China, the grading standards of the main characters of summer maize were formulated. According to this standard, the calculation procedure of improved contingency table method was used to analyze the data of the ecological area from 1991 to 19955a, and a quantitative model for the comprehensive evaluation of summer maize combination was established. This method has good usability in maize breeding practice.