华北地区玉米杂交种农艺性状演变规律的研究

为给高产玉米杂交种选育提供理论依据,对华北地区近40年有代表性的25个杂交种农艺性状的演变进行了研究。试验采用方差分析、多重比较、相关和通径分析等方法分析了农艺性状的变化及其与产量的关系。结果表明:密度增大,公顷粒数和千粒重提高、抗病性增强是现代玉米杂交种增产的主要演变规律。在华北地区玉米杂交种选育中,主攻方向是选育公顷粒数多、千粒重高、抗病性和抗倒性好、耐密性强的优良玉米杂交种。

Study on Development Law for Agronomic Traits of Maize Hybrids in North China

The analysis of agronomic traits on development law,which was based on the split-plot experimental design with varieties from different eras of north China as sub-plot as well as density as main plot,was carried out in Beijing in 2005.By the methods of analysis of variance,Ducan''s multiple test,correlation and path coefficients,the results showed that increasing density,kernels per ha.as well as 1000 kernel weight andimproving resistance to disease and lodging are featured as the main development law of popular maize varieties in north China.These indicated that the key maize breeding goal in north China should be varieties with more kernels per ha.,heavier 1000 kernel weight,higher resistance to disease and better tolerance to high density.