迄今为止的玉米育种工作,侧重于提高穗粒重,但要进一步大幅度提高玉米产量,仍着眼于穗粒重,潜力较小,难度较大,必须在保证一定穗粒重的基础上再从增加穗数方面挖潜力.因此,多穗性育种是当前国内外玉米育种的重要途径之一.我所玉米双穗性育种工作从1961年开始,先后选出了海7、南55、黄162、衡白522、衡白525等双穗株率高,遗传力强的优 So far the corn breeding work, focusing on improving ear grain weight, but to further significantly increase the yield of corn, still focus on grain weight per spike, the potential is small, more difficult, must ensure a certain grain weight on the basis of Therefore, multi-spike breeding is one of the most important ways to breed maize domestically at home and abroad.My double-spike breeding work in maize has been carried out since 1961, and has selected sea 7, southern 55, yellow 162 , Hengbai 522, Hengbai 525 and other double-ear plant rate, superior genetic ability