玉米大喇叭口期就是从拔节到抽雄所经历的时期(玉米13—14片叶),也是营养生长和生殖生长并进阶段,根、茎、叶的生长非常旺盛,体积迅速扩大、干重急剧增加,同时,雄穗已发育成熟,各器官间开始争夺养分,群体和个体以及个体之间矛盾日益突出。生产实践证明,此期落实好各项增产措施,能获得显著的增产效果。因此,喇叭口期是玉米生长发育的关键时期,也是落实 Corn trumpet period is the period from jointing to tasseling (13-14 leaves of maize), but also vegetative and reproductive growth and advanced stage, the growth of roots, stems and leaves is very vigorous, the volume is rapidly expanding, and the dry weight increases sharply At the same time, the tassel has matured, the organs began to compete for nutrients, groups and individuals as well as the contradiction between the individual has become increasingly prominent. Production practice has proved that the current implementation of the various measures to increase production, access to significant increase in production. Therefore, the bell mouth is a critical period of corn growth and development, but also the implementation