| The effects of cutting root system in different depth(20 cm and 40 cm) at jointing stage and booting stage on the growth of roots and aerial parts as well as the yield of proso millet were studied with the method of soil column cultivation.The results showed that:(1) As compared with CK(without cutting root),root cutting could lead to the significant decreases of plant height,chlorophyll content of flag leaf,SOD and POD activity of flag leaf,green leaf area,total root activity,total root length,total root weight and yield,while the MDA content of flag leaf was increased significantly;(2) The yield reduction by root cutting at booting stage was higher than that at jointing stage;(3) There was no significant difference of yield between different depth of root cutting(20cm or 40cm) at same growth stage,which indicted that the roots below 40cm were more important for the yield formation of proso millet. |