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早熟玉米单交种子粒产量低的主要原因是营养生长期短，形成的叶片少且面积小，光合产物供应不足，从而导致穗部性状的劣化和子粒产量的不稳定性。以早熟为前提子粒高产的育种途径，除配合力选育外，还可以通过提高叶片生长率来实现。通过试验研究提出，在高配合力前提下把具有潜在高灌浆速率的早熟自交系同一定的中晚熟自交系组配单交，不仅可使营养生长期显著延长，同化物供应改善，而且也可使灌浆期显著缩短，从而达到早熟高产的目的。
The main reasons for the low yield of early maturing maize seed cross were the short vegetative growth period, the small and small leaves formed and the insufficient supply of photosynthetic products, leading to the deterioration of ear traits and the instability of grain yield. In order to precocious grain as a prerequisite breeding methods of breeding, in addition to combining ability to breeding, but also by increasing the rate of leaf growth to achieve. According to the experimental research, combining early-maturity inbred lines with the potential high-filling rate with the same late-maturing inbred lines under the condition of high combining ability can not only significantly prolong vegetative growth stage and assimilate supply, but also Can also significantly shorten the filling period, so as to achieve the purpose of early maturity and high yield.