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本文根据我院１９８６～１９９４年的玉米丰歉定位试验结果分析得出：丰年ＬＡＩ、ＬＡＤ消长合理，呈“前快、中稳、后衰慢”的变化动态。ＮＡＲ的变化呈波动曲线，各类型年ＮＡＲ波动次数不同，总的同化能力丰年＞平年＞歉年。生长期内降水及中、后期日照基本满足光合性能的需求。前期（６月１０日～６月３０日）日照是影响光合性能的主导因素，后期（７月３１日～９月２０日）气象条件匹配合理，将有利于光合产物积累，实现稳产。但积温过高，将加速叶片衰老，引起玉米早衰。ＬＡＩ在前期对产量贡献最大，ＬＡＤ在中、后期对产量贡献最大。
Based on the results of the experiment of locating corn apologists in 1986-1994 in our hospital, the results show that the growth and development of LAI and LAD in the harvest year are reasonable, showing the change dynamics of “fast, stable before and after slow”. The change of NAR showed a fluctuating curve, and the number of NAR fluctuations varied with different types of years. The overall assimilative capacity of Feng Nian> Ping Nian> Yin Nian years. Precipitation during the growing season and the late sunshine basically meet photosynthetic performance needs. In the early period (June 10 to June 30), sunshine is the dominant factor affecting photosynthetic performance. Matching weather conditions in the later period (July 31 to September 20) will be conducive to the accumulation of photosynthetic products and achieve stable production. But the temperature is too high, will accelerate leaf aging, causing premature corn failure. LAI in the early contribution to the largest production, LAD in the late contribution to the maximum output.