Effects of Planting Density on Yield and Population Character of Common Millet Species

The effects of different planting densities(30.0×104,37.5×104,45.0×104,52.5×104,60.0×104 plants/hm2)on yield and population character of Chenggu No.13,Chaogu No.13 and Kuanjiu were studied by split block test design.The results showed that under the planting density of 30.0×104-60.0×104plants/hm2,with the increasing of planting density,chlorophyll content,leaf area index,dry materials above ground were increased gradually,transmission rate was decreased gradually,yield was increased first and then decreased.The population characters of the three normal foxtail millet were that the planting density was 37.5×104-45.0×104 plants/hm2,leaf area index at following stage was 4.30-4.63,economic index was higher and transmission of light was better.The results of multiple regression analysis on population characters and yield under different planting densities at following stage showed that there was significant regression relationship between dry matter yield aboveground and yield.The results of path analysis on dry matter yield aboveground,economic coefficient and yield further showed that dry matter yield aboveground was the material foundation for high yield,but was restricted by economy coefficient obviously.