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１９９３～１９９４年研究了田间生长条件下５个玉米杂交种棒３叶的光合强度（Ｐａ）、比叶重（ＳＬＷ）、叶氮量（ＮＬＡ）、叶肉厚度（ＬＴ）、气孔密度（ＳＦ）、维管束密度（ＶＢＦ）等光合性状。结果表明：（１）各杂交种棒３叶的Ｐａ高峰均出现在吐丝期，不同杂交种从吐丝期到成熟期的Ｐａ动态变化不同，ＳＬＷ、ＮＬＡ的动态变化趋势相似。（２）不同玉米杂交种的Ｐａ、ＳＬＷ、ＮＬＡ、ＬＴ、ＳＦ、ＶＢＦ表现差异显著。（３）玉米吐丝期棒３叶的ＳＬＷ、ＮＬＡ、ＬＴ、ＳＦ、ＶＢＦ与Ｐａ均呈显著正相关，对棒３叶Ｐａ的贡献是：ＮＬＡ＞ＳＬＷ＞ＬＴ＞ＳＦ＞ＶＢＦ。（４）Ｐａ、ＳＬＷ、ＮＬＡ、ＭＦ属于数量性状遗传，ＳＦ、ＶＢＦ属于质量性状遗传。
The photosynthetic (Pa), specific gravity (SLW), leaf nitrogen (NA), leaf thickness (LT), stomatal density (SF) of three maize hybrids were studied under field conditions from 1993 to 1994, , Vascular bundle density (VBF) and other photosynthetic characteristics. The results showed that: (1) Pa peak of three hybrids appeared in the silking stage. The dynamic changes of Pa in different hybrids from silking stage to mature stage were different. The dynamic changes of SLW and NLA were similar. (2) Pa, SLW, NLA, LT, SF and VBF showed significant differences among different maize hybrids. (3) There was a significant positive correlation between SLW, NLA, LT, SF, VBF and Pa in the three leaves of corn during silking stage. The contributions to Pa with three leaves were NLA> SLW> LT> SF> VBF. (4) Pa, SLW, NLA, MF belong to the quantitative trait inheritance, SF, VBF belong to the quality trait inheritance.