| The increase of yield is largely due to the increasing resistance of varieties,especially indensity tolerance. The adaptability of the variety to the density and the environmentalconditions plays an important role in achieving high yield. In different areas of Yangling andChangwu, effects of planting densities on grain yield, dry matter, nitrogen accumulation andphysiological properties were studied in two high-yielding maize cultivars（Shandan609andZhengdan958）with four planting densities(45000,60000,75000,90000plants·hm-2), and getthe change rule of yield with planting density in different Ecological areas, aim to providecertain theoretical basis for the research of maize breeding. The results are as follows:1. There was no significant difference in yield of different varieties. By regressionequation, the results show that the highest yield of Shandan609was in the density of568,29plants·hm-2,the highest yield of Zhengdan958was in the density of608,18plants·hm-2forthe experiment of Yangling; the highest yield of Shandan609was in the density of953,30·hm-2plants·hm-2, the highest yield of Zhengdan958was in the density of926,90·hm-2for the experiment of Changwu.2. The translocations of dry matter in vegetative organs and the net photosynthetic rate ofShandan609was higher than Zhengdan958，and there was no significant difference in otherphysiological parameters of different varieties under different densities.3. The translocations of dry matter in vegetative organs and the net photosynthetic rate ofShandan609was higher than Zhengdan958，and there was no significant difference in otherphysiological parameters of different varieties in different regions.4. Planting density had no significant influences on leaf net photosynthetic rate, leafSPAD value and light interception rate. But it had significant influences on otherphysiological parameters. With the increase of planting density, these physiologicalparameters increased significantly. |
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