近年来,玉米生产过程中,空杆、倒伏现象比较严重,造成玉米减产10%以上,有的可达20%～30%。因地制宜针对空杆、倒伏发生的原因,采取预防措施对玉米增产尤其必要。一、空杆1.原因玉米空杆原因有多种,一是遗传原因;二是果穗发育时期,玉米体内营养失调,果穗内淀粉含量不足;三是水肥 In recent years, corn production process, empty pole, lodging more serious, resulting in maize cut 10% or more, and some up to 20% to 30%. According to local conditions for the empty pole, the reasons for the occurrence of lodging, to take precautionary measures on maize yield is especially necessary. First, the empty rod 1. The reasons for corn empty rod for a variety of reasons, one genetic reason; the second is the ear development period, maize in vivo malnutrition, lack of starch within the ear; third is the water and fertilizer