| Study was made on population quality indice of super highyield cotton(lint yield over 3 000 kg/hm2)in south Xinjiang in 2008~2009 to exposund the effects of them on yield component factors and to provide theory for large-area planting of super high yield cotton in Xinjiang. The main results were as follows: Compared with high yield and middle-low yield cotton, the increase of plant height and bud fomming of super high yield cotton was fast before flowering stage and the plant height reached 55 cm in flowering stage; in boll forming stage, 2.5~3 boll formned with the increase of each leaf; the LAI grew faster and reach 4.5 in flower peaking stage, and the leaf Pn maintained in a higher level and reached 35 μmol/(m2·s) in the same period, while they decreased more slowly in the begining of boll opening stage，prolonging the leaf functioning period and keeping a larger area for effective photosynthesis in the later stages; the boll load of unit leaf area was significantly higher, reaching 91 bolls/m2. |