玉米拔节至抽穗期也称穗粒期,此期营养生长与生殖生长并进,既长根、茎、叶,又分化发育雄、雌穗。在栽培实践中,几乎所有的农业措施都是首先影响根系的生长,田间管理要适应根系的生长规律。根据我们近三年来对玉米根系生长动态观察及地上部与地下部关系,提出旱地玉米拔节至抽穗期的田间管理措施。一、拔节至抽穗期的根系 Corn jointing to heading also known as spikelet period, this period of vegetative and reproductive growth go hand in hand, both roots, stems, leaves, and differentiation of male and female ears. In cultivation practice, almost all the agricultural measures are the first to affect the growth of the root system, field management to adapt to the growth of the root law. According to the dynamic observation of root growth of maize in the past three years and the relationship between aboveground and underground parts, we put forward field management measures for maize upland to heading stage in dryland. First, the root system of jointing to heading date