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通过玉米生产中常用增产措施──更换品种、合理密度、大口期追肥和齐苗对玉米光合特性与产量性状影响的研究结果表明；①5个供试品种间虽产量达极显著差异，但单叶光合速率的差异未达显著水平．在同一基因型内，种植密度和大口期追肥两种措施对叶面积和光合速率均产生了明显的影响，进而导致产量的不同．且光合速率对增密的反应较叶面积更敏感．②随植株密度增加，株间光合速率间的变异增大。③在株间雌穗库差异较大的状态下，叶片光合速率与产量呈显著的正相关关系。
The results of the research on the effects of changing varieties, reasonable density, top-dressing, and Qi-Miao on the photosynthetic characteristics and yield traits of maize indicated that ① the yield of five tested cultivars reached a very significant difference, Differences in photosynthetic rate did not reach significant level. Within the same genotype, two measures of planting density and big-mouth top dressing had a significant effect on leaf area and photosynthetic rate, which led to different yield. And photosynthetic rate response to densification is more sensitive than leaf area. With the increase of plant density, the variation of photosynthetic rate between plants increased. ③ There was a significant positive correlation between leaf photosynthesis rate and yield under the condition of large differences in the number of spike lines between the strains.