遗传改良对中国华北不同年代玉米单交种产量的贡献

Contributions of Genetic Improvement to Yields of Maize Hybrids During Different Eras in North China

中国农业科学 . 2009, (3): 781 -789 .  DOI: 10.3864/j.issn.0578-1752.2009.03.004