近年,随着夏玉米大面积贴茬机播,大田缺苗、弱小苗现象显著增加,部分地块重达20％～30％,导致成熟后期空秆、小棒率也明显增加。在保证种子质量的前提下,机播玉米缺苗、弱小苗的发生与机播质量有关,提高机播质量是当前夏玉米生产的当务之急。1 播前检修 认真搞好播前机械检修,是保证机播质量的首要措施。具体检修事项和标准应按机械说明进 In recent years, with the large area of ​​summer corn stubble planting, field lack of seedlings, weak seedling phenomenon increased significantly, some plots weighing 20% ​​to 30%, resulting in the late mature stalks, streak rate is also significantly increased. Under the premise of ensuring the quality of seeds, the lack of seedling seeding machine, weak seedlings and machine-borne quality of the occurrence, to improve the quality of machine-borne is the current summer corn production imperative. 1 pre-broadcast maintenance seriously do a good job before broadcast mechanical maintenance, is the primary measure to ensure the quality of airborne. Specific maintenance issues and standards should be mechanical instructions into