Abstract:

The suitable combination of planting density is favorable for the yield increase of sorghum cultivar. In order to determine rational planting density of sorghum and to fully develop yield-increasing effect, a field trial with a sorghum variety ‘Jingzhong 911’ was conducted in Taigu, Shanxi Province, China to investigate the effects of different planting densities (ranging from 75000 to 150000 plants/hm2) on main agronomic characters and yield in a randomized block design. The results showed that with the increase of planting density, stem diameter tended to decrease, while the plant height, leaf area and leaf number seen no significant change in trend; The effects of planting density on yield traits were mainly 1000-kernel weight and weight/panicle, and yield both showed a significant negative correlation, and both have a higher impact coordination on production. In the late-maturing sorghum growing areas of dry land, by increasing planting density can significantly increase grain yield. It is concluded that when planting density 15.00 × 104 plants/hm2, the highest sorghum grain yield. The study of middle-late maturing short-stalked sorghum in dry areas to increase plant density provides a theoretical and technical support.