Effects of Substitution for Chemical Fertilizer with Organic Manure on the Cotton Yield and Yield Components in Cotton Area

【Objective】 To clarify the right rate and filter the best mode of chemical fertilizer reduction and organic fertilizer supplement of cotton. 【Method】 The effects of the partial substitution for chemiacal fertilizer with organic manure (20%, 40% or 100%) on the cotton yield and yield components were ananlyzed by field experiments with no fertilizer (CK) and inorganic fertilizer(CF)as the control. 【Result】 Fertilization could significantly improve the composition of cotton yield and increase the yield of cotton. Compared with CF, the treatment of reducing 20%, 40% chemical fertilizer with organic manure could improve cotton yierld components by raising the weight per boll and ginning outtum,significantly increase cotton yield. The cotton yields of Treatment 3 and Treatment 4 were 423.50 and 403.76 kg/667m² , respectively,which were 27.70% and 21.75% higher than that of non-fertilization treatmemnt (CK), and 5.81% and 0.88% higher than that of CF. 【Conclusion】 Analysing by the yield of cotton and agricultural environmental protection,the suitable fertilization management model of cotton in Southern Xinjiang cotton district is the reducing 20% or 40% chemical fertilizer with organic manure, that is 400 kg/667m² organic manure and 65.39 kg /667m² inorganic compound fertilizer as basic fertilizer, and 22.35 kg/667m² urea as top dressing(that is 800 kg/667m² organic manure and 49.04 kg /667m² inorganic compound fertilizer as basic fertilizer, and 16.76 kg /667m² urea as top dressing).The treatment model Treatment3、Treatment4 of reducing 20% or 40% chemical fertilizer with organic manure could be considered to promote and applicate.