摘要： 利用灰色系统理论，分析了8个影响玉米单交种产量相关因素，结果表明，产量因素与产量的关系依次为行粒数>百粒重>穗长>株高>穗行数>穗位高>穗粗>播种至抽丝天数。研究了18个玉米杂交组合的优劣，将18个玉米杂交组合分为3类。同时对自交系进行了分析，表明综31和P167是较好的自交系。初步探讨了灰色系统理论在玉米育种上的综合应用。

关键词: 灰色系统理论, 关联度, 玉米, 育种, 参考组合

Abstract: Eight factors influencing maize yield were studied by using grey system theory.The results showed that the order of each character of its relational grade decreases as follows:line seed number, 100-seed weight, ear length, plant height, ear line number, ear height, ear diameter, the days from sowing to flower.Eighteen maize cross combination was analysed, which was divided into three classes.At the same time, we have studied inbreds.The results indicated that zhong 31and P167 were better than others.In addition, the comprehensive application of grey system theory to maize breeding was discussed preliminarily.

Key words: Grey system theory , Relational grade, Maize breeding, Reference combination