Maize (Zea mays L.) is one of the main food crops in China but the problems with lodging have seriously affected the quality and production. In this study, lodging resistant and density tolerant varieties of maize were screened. The relationships between rind penetration strength (RPS), stalk breaking strength (SBS), and yield under two different planting densities were studied. Eight hybrid combinations were set up under the planting densities of 75,000 and 90,000 plants ha^–2 and their effects on yield were determined with a regression equation method. The results showed that density had a greater effect on yield through its effect on lodging rate. Finally, high-yielding maize varieties JKY143 and JKY182 with stronger planting density tolerance were selected to provide reference points and technical support for maize-breeding programs focusing on plant density tolerance and lodging resistance.

中文翻译：

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不同种植密度下玉米产量与倒伏性状的关系

玉米( Zea mays L.)是我国主要粮食作物之一，但倒伏问题严重影响了玉米的质量和产量。在这项研究中，筛选了抗倒伏和耐密度的玉米品种。研究了两种不同种植密度下果皮穿透强度（RPS）、茎秆断裂强度（SBS）和产量之间的关系。在 7.5 万株和 9 万株公顷的种植密度下设置了 8 个杂交组合^–2并用回归方程法确定它们对产量的影响。结果表明，密度通过影响倒伏率对产量的影响更大。最后，筛选出耐种植密度较强的高产玉米品种JKY143和JKY182，为以耐种植密度和抗倒伏性为重点的玉米育种方案提供参考点和技术支持。