Study on the Root Systems for Different Types of Winter Wheat

<正> Root growth traits for different wheat types varied during the growth cycle. The root system of 93 Zhong 6, which is a dwarf, big-ear variety, reached its highest density at anthesis, while the root density of Zhoumai 13, a medium-type variety, demonsrated its highest value during the node elongation stage and decreased rapidly at later growth stages, which resulted in lower yield. The root density of Zhongyu 6 and 98