Abstract: The effects of five planting densities on main agronomic characters, boll setting and yield of direct-seeded cotton（Gossypium spp） in summer were studied under the condition of one-time flowering fertilization and fixed N, P and K fertilization ratio. The results showed that the boll number and boll weight of direct seeding cotton in summer had obvious effects on yield-related traits when planting density was 67 500~75 000 plants/hm², and the number of rotten bolls would increase with the increase of planting density. Therefore, the planting density could be used as a reference density for high-yield cultivation of direct seeding cotton in summer.

Key words: summer direct-seeding cotton（Gossypium spp）, planting density, growth, yield