Effects of Density on Photosynthetic Physiological Characteristics and Yield of Maize

The study was carried on effects of density on photosynthetic physiological characteristics and yield of maize with Langyu No.6 and Nongda 108. The results showed that Pn, chlorophyll content , soluble protein content, leaf area and dry weight per plant dropped by density increasing, leaf area index, population dry weight, leaf area duration and crop growth rate increased with increasing density. The effect was more significant in post-stage than that in earlier-stage. The response to density of Langyu No.6 was more slowly than that of Nongda 108, both single plant and population characteristics, which showed that Langyu No.6 density-resistant was more tolerance than Nongda 108. The suitable planting density of Langyu No.6 and Nongda 108 were 67 500 plants/ha and 60 000 plants/ha respectively under this experiment condition.