【Objective】Rational fertilization and adoption of soil amendment is one of the ways to improve acidic soil and reduce fertilizer.By studying the effects of phosphorus potassium nitrate compound fertilizer combined with Calcium oxide conditioner on vegetable yield,nutrient absorption and utilization and soil pH,so as to determine the optimal fertilization scheme for acidified vegetables.【Method】Four treatments were set up in the experiment:(i)Conventional fertilization(CK);(ii)Tianji Conditioner(CT);(iii)Tianji Phosphate Potassium Nitrate Compound Fertilizer(CY);(iv)Tianji NPK Compound Fertilizer + Conditioner(CYT),the changes of yield,biomass,nutrient absorption and utilization and soil pH value of cauliflower and pickled mustard tuber were studied under different fertilization treatments.【Result】Compared with CK,under the condition that CYT treatment reduces the fertilizer application amount by 25 %-33.3 %,the yield and biomass of cauliflower and mustard tuber were increased significantly(P<0.05); The cumulative uptake of nitrogen,phosphorus and potassium in cauliflower was significantly increased by 20.19 %,28.38 % and 25.93 % respectively.(P<0.05); The apparent utilization rate of nitrogen,phosphorus and potassium was significantly increased by 15.77 %,18 % and 64.06 %,respectively(P<0.05); The cumulative uptake of nitrogen,phosphorus and potassium in mustard tuber products increased significantly by 19.17 %,28.82 % and 20.1 %,respectively(P<0.05); In addition,the soil pH was increased by 0.7 and 0.3 units when mixed with potassium phosphate nitrate compound fertilizer and conditioner; The content of exchangeable calcium in soil increased by 28.9 % and 42.6 % respectively; The exchangeable acid content of pickled mustard decreased by 2.13 % and soil acidification was improved.【Conclusion】Phosphorus potassium nitrate compound fertilizer combined with calcium oxide conditioner can increase vegetable yield,fertilizer apparent utilization rate,soil pH and exchangeable calcium content,and reduce soil exchangeable acid content.Therefore,the application of calcium oxide conditioner in the compound fertilizer of phosphorus and potassium nitrate in purple soil area of Chongqing is an effective way to reduce the amount of fertilizer applied in farmland and adjust soil acidification. [ABSTRACT FROM AUTHOR]