高密度下春玉米品种耐密稳产性与生产适应性评价OA

[Objective]Under simulated field conditions of actual seed usage and sowing practices,this study evaluated the population estab-lishment capacity,agronomic adaptability,and yield stability of spring maize varieties under high-density planting.The aim was to provide a basis for the precise selection of density-tolerant varieties in production.[Method]In 2025,at the Ninth Division of the Xinjiang Production and Construction Corps,ten widely promoted spring maize hybrids were used as experimental materials.Unselected commercial seeds were sown uniformly at a high planting density of(40.0 cm+60.0 cm)×14.5 cm(theoretical density≥136 500 plants/hm2).Measured traits in-cluded actual emergence rate,seedling preservation density,agronomic traits,leaf area index(LAI)of the three leaves adjacent to the ear,and yield.Stability was analyzed using regression coefficient and Shukla's variance.[Result]Significant differences were observed among va-rieties in population establishment capacity.The actual emergence rate ranged from 78.94%to 95.06%,the achievement rate of seedling pres-ervation density at maturity ranged from 72.83%to 86.20%,and the barren stalk rate ranged from 1.20%to 5.80%.Jinli 1702 and DF20 ex-hibited a compact and upright leaf type(with small leaf angles of the three leaves adjacent to the ear),a relatively high LAI,and strong lodg-ing resistance,yielding significantly higher yields(18 923.55 and 18 663.75 kg/hm2,respectively).Stability analysis indicated that Jinli 1702 and DF20 were high-yielding and highly stable varieties;Huaxi 703 was a high-yielding and stable variety;while Bixiang 228 showed poor sta-bility.[Conclusion]This study demonstrates that under simulated high-density cultivation conditions,population establishment capacity(actu-al emergence rate and achievement rate of seedling preservation density)of a variety is the primary indicator of its comprehensive adaptability and is directly influenced by the quality of commercial seeds.The overall performance suggests that Jinli 1702 and DF20 possess excellent den-sity tolerance,canopy structural advantages,and high and stable yield characteristics,making them suitable as priority varieties for high-den-sity cultivation in this region.