不同类型玉米主要农艺性状的相关和通径分析

为探索沧州生态类型区主要农艺性状在玉米产量构成中的相对重要性，以及不同类型品种之间的差别，以自主选育的116个不同类型玉米杂交组合为研究对象，通过随机区组品比试验，进行主要农艺性状的相关和通径分析。结果表明：2000年前传统育种材料育成品种，产量与穗长和千粒重呈极显著正相关，对产量贡献作用最大的是千粒重；2000年后至今的新型育种材料育成品种，产量与穗长和行粒数呈极显著正相关，对产量作用贡献最大的是行粒数，与传统材料育成品种的分析结果有所不同，分析其原因为育种目标变化而引起的新育种材料的引进，但仍需进一步验证。

Correlation and Path Analysis of Major Agronomic Character of Different Types of Maize

The correlation and path analysis of yield and agronomic traits of 116 different types of maize combinations were made by the randomized block experiment in order to explore the relative importance of main agronomic characters in maize yield composition and the differences among different species in cangzhou ecological types area. The results showed that the yield of the varieties of traditional breeding materials before 2000 was very significantly correlated with ear length and 1000-seed weight. The greatest effect of samples production of maize was caused by 1000-seed weight. The yield of the varieties of new breeding materials since 2000 was very significantly correlated with ear length and row grains. The greatest effect of samples production of maize was caused by row grains, which was different from the varieties of traditional breeding materials. The main reason was that the new breeding materials were introduced due to the replacement of breeding targets, which still need further validation.