【摘要】 研究明确深松和深翻两个主要深耕方式下，不同耐密性玉米品种在高低种植密度下的根系形态特征的变化。结果表明，深松和深翻均可提高根系各指标吐丝期前的增加幅度并减小生育后期降低的幅度，且深翻对强耐密性品种作用更明显。深翻可有效缓解增密后强耐密性品种1～2 mm直径根的根长、支柱根条数、冠根条数的降低幅度，分别达9.04、7.76和9.00百分点。因此，深翻耕作可以促进高密条件下细根的生长发育，并减小生育后期根系的降低幅度，使玉米在增密条件下仍能拥有合理的根系形态。更多还原

【Abstract】 The purpose of this study was to clarify the changes of root morphological characteristics of different density-tolerant maize varieties under high and low planting densities under the two main deep tillage methods of subsoiling and deep plowing. The results showed that both subsoiling and deep plowing could increase the increase range of root indexes before silking stage and reduce the decrease range at late growth stage, and deep plowing had more obvious effect on strong density-tolerant varieties. Deep plowing could effectively alleviate the decrease of root length, number of pillar roots and number of crown roots of 1-2 mm diameter roots of strong density-tolerant varieties after densification, reaching 9.04, 7.76 and 9.00 percentage points, respectively. Therefore, deep tillage can promote the growth and development of fine roots under high density conditions, and reduce the decrease of root system in the later stage of growth, so that maize can still have a reasonable root morphology under the condition of increasing density.更多还原