玉米庞大的根系具有吸收、合成、输导和固定等作用。它的生育状况与活力,直接影响植株的生长和产量水平。所以探讨根系的发展动态,测定其生活力的变化规律是高产栽培中值得重视的课题。我们于1980～1982年以夏播豫农704为材料,采用铁丝筐塑料袋栽植;不同时期(全生育期十次)冲根,对根系的生育规律进行了观察测定。其结果报告如下、 The huge corn root has the function of absorption, synthesis, conduction and fixation. Its fertility status and vitality directly affect plant growth and yield levels. Therefore, exploring the dynamic development of the root system and measuring the variation of its viability is a topic deserving attention in high-yielding cultivation. In 1980 ~ 1982, we planted YUNNONG 704 as summer sowing material and used wire basket plastic bag to plant. During different periods (full growth period ten times), root growth and development were observed and measured. The results are reported as follows,