In order to explore the optimum planting density of foxtail millet varieties in northwestern China,Yangu 14,Changsheng 07,and Jinfen 107 were selected as the experimental materials and four different planting densities of 3.9×105(D1),5.1×105(D2),6.3×105(D3)and 7.5×105(D4)plants/ha were set.Then the effects of planting density on the agronomic traits and yield of foxtail millet were analyzed.The results showed that with the increase of planting density,the plant height increased,while the stem diameter,panicle length,panicle diameter,weight per panicle,grain weight per panicle and 1000-grain weight all decreased gradually.The yield increased first and then decreased.The yield of Yangu 14 was the highest under D3 treatment,reaching 5969.65 kg/ha.The yield of Changsheng 07 and Jinfen 107 both reached the maximum under D2 treatment,which were 4606.47 and 4710.69 kg/ha,respectively.Based on the results above,the suitable planting densities of foxtail millet in the middle and late-maturing spring-sowing region were 5.1×105-6.3×105 plants/ha.
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