| In order to study the growth and development characteristics of cotton,photosynthesis production,nutrients absorption and distribution,yield and quality under fruit-cotton intercropping growing model in south of Xinjiang,a experiment was conducted at Kashgar City Yuepuhuxian Bazaar Township,under Section 7, Village 5,form March to November 2010.This experiment had analysed the effect on growth and development of cotton,yield and yield components and fiber quality in apricot-cotton intercropping system,at the same time we also compared and analysed photosynthesis,canopy structure,the aboveground apart nutrients absorption and distribution,aimed at providing theoretical basis for grain/fruit-cotton cultivation in Xinjiang.The main experiment results as follows:1.The whole growing period of intercropping cotton was shorter than the solo cotton by 8 d;the main stem growth rste of intercropping was 0.83 cm·d-1,0.91 cm·d-1 for solo cotton, after head picking,the plant height of intercropping cotton was 58.01 cm,solo cotton was 64.51 cm; Under intercropping conditions,internode elongation,the high of first node rised,fruit branch length of the middle and lower of intercropping cotton were longer than solo cotton,the total number of fruit bites were lower than the solo cotton by 53.47%,boll ratio was lower than the solo cotton by 6.99%;In lateral distribution,the inner bolls of intercropping cotton was 58% of the total,67% for solo cotton,in the vertical distribution,the middle bolls of intercropping cotton was 31%,lower than the solo cotton by 10%;"three boll" ratio of intercropping cotton was 0.11:0.78:0.11,solo cotton was 0.26:0.67:0.07.2.Compared with solo cotton,LAI of intercropping cotton increased faster before full flowering stage,and reached the max value 4.31 at full flowering stage,but the LAI of solo cotton reached it's max value 4.63 at full ball stage;The MTA of solo cotton and intercropping cotton increased with growth stage and reached the peak value 50.at full ball stage,which increased DIFN of cotton groups and decreased available area of photosynthesis so as to decreased the utilization efficiency of solar energy;the SPAD values of leaf that opposite the ball were lower than that of the solo cotton from bud stage to full ball stage;Under apricot-cotton intercropping conditions,the Pn of cotton had no significant difference between intercropping cotton and solo cotton,the Ci of intercropping cotton were higher,the GS were bigger,so as to slowed down Evaporation and decreased Pn and the individual ball weight and yield went hand in hand with the dry matter accumulation decreased.3.The nutrient N accumulation rates of intercropping cotton were fastest at 77 days after sprout,10 days later than solo cotton,The nutrient P2O5,accumulation rates were fastest at 79 days after sprout,4 days later than solo cotton,The nutrient K2O accumulation rates were fastest at 76 days after sprout,half a month later than solo cotton;The fastest nutrient N accumulation rate of intercropping cotton was 3.02kg·d-1,33.5% lower than that of the solo cotton,the fastest nutrient P2O5 accumulation rate of intercropping cotton was 1.62kg·d-1,40.4% lower than that of the solo cotton,the fastest nutrient K2Oaccumulation rate of intercropping cotton was2.06 kg·d-1,58.6% lower than that of the solo cotton;The nutrients N,P2O5,K2O fast accumulation of intercropping cotton individual lasted 37,33,63 days.4.Lint percentage had decreased under intercropping condition,the expected harvest plant number was 183400 plant·hm-2,balls per plant was 3.6,lint percentage 38.6%,lint yield 1352.84 kg·hm-2,which was lower than the solo cotton by 43.8%;Under intercropping condition,with the less sunlight,lower temperature,higher humidity,which slowed down the fiber combination and decreased the fiber quality.
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