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Zheng 958, Toyotama two summer maize varieties, spacing configuration of different density conditions under summer maize growth and development, dry matter accumulation, lodging resistance and yield explore through reasonable spacing configuration to further improve the feasibility of planting density to provide a theoretical basis for the realization of the corn yield, further breakthrough. The results are as follows: 1. Density and dry matter accumulation was significantly negatively correlated. As the density increases, the amount of dry matter accumulation per plant decreased gradually, 67500 / hm2 than 97,500 / hm to 2 per plant dry weight increase of 35.13%. Spacing and dry matter accumulation was significantly negatively correlated. Density conditions, with the increase of row spacing, plant dry matter weight, 50cm row spacing than 90cm row spacing per plant dry weight increased by 5.45% -23.89%. Therefore, under the conditions of high density narrow line spacing the increase ZhuJu effective way to increase the amount of dry matter accumulation of summer maize. As the density increases, the leaf area per plant decreased; groups the LAI, groups gradually increased photosynthetic potential. Certain density conditions, 90cm row spacing peak leaf area of ??short duration, spinning 30 days after the leaf area index decreased rapidly, total photosynthetic potential of 50cm row spacing significantly higher than 90cm row spacing. With reduction of row spacing, plant spacing increases, the total photosynthetic potential increase of 2% -24%. Shows that, under the conditions of high density increases the line spacing serious reduced ZhuJu premature aging phenomenon weak light interception ability, low utilization of solar energy. Affect the performance of the density of summer corn stalk traits with increasing density, plant height, stem diameter, tapering. Density hardness, fracture resistance, and plants tensile strength of the base section of stem had significant impact. With the stem basal internodes hardness, fracture resistance and plant density increases the tensile strength decreased significantly. Spacing configuration have a significant impact on the stem base hardness, fracture resistance, and plants tensile strength. Density conditions, with increased plant spacing narrow line spacing, plant height, stem diameter, tapering the stem base hardness, flexural strength, tensile strength and plants significantly decreased. Therefore, the high-density conditions indentation under increasing strains help to improve lodging resistance of plants. Density on corn yield, the presence of significant, very significant impact. As the density increases, the output increases, the density increases to a certain extent, the lower yield. Spacing configuration on corn yield, the presence of significant, very significant impact. Certain density conditions, 50cm row spacing significantly higher than other treatments, an increase of 3.78% -9.86% 50cm row spacing than the other treatments. High-yielding planting area in Hebei Province, line spacing should be adjusted to 50cm.
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