通过对山东省70～80年代早熟夏玉米高产杂交种主要农艺性状的分析,认为高产杂交种产量潜力的增加主要是由于提高了籽粒的千粒重,增强了品种的抗病性和因株型紧凑而增加了密度,其次是增加了穗长和穗粒数,但与穗行数无关。今后,早熟玉米育种应以大粒、抗病和紧凑株型为主要目标。 Based on the analysis of the main agronomic traits of early maturing summer maize hybrids in Shandong Province from 1970s to 1980, it is considered that the increase of yield potential of high yielding hybrids is mainly due to the increased grain weight, enhanced disease resistance and compactness Increased density, followed by an increase of spike length and grain number per spike, but not related to the number of ears. In the future, precocious maize breeding should be the main target of large grain, disease-resistant and compact plant type.