紧凑型玉米根系高产特性的研究

紧凑型玉米比平展型玉米容易获得高产,根系性状良好是重要原因之一.主要表现为:根系干重苗期发展快,后期变化平稳.深层根量较多,水平分布紧凑,耐密植.密植条件下,籽粒增重期根系吸收活力高,活跃吸收层深.气生根发达,气生根根系活力受密度影响小,对产量贡献大.

Study on the Characteristics of Root System in High-yield Upright-leaf Maize

It was easier to acquire high yield of maize by using upright-leaf varieties than spreading-leaf varieties because the former had good root characteristics. Its principal results as follows: the dry matter weight of root increased quickly in seedliing period and varied slowly in the late period of the development. There were many roots in deeper soil and they distributed tightly in horizon. Therefore it was suitable for compact-planting. Under compact-planting, the root absorbing activity was higher in grain-filling period and the aerial roots,which activity was affected slightly by the planting density and had greater contributions to yield,were developed.