土壤调理剂对连作桃园土壤肥力及果实品质的影响OA

Long-term peach cultivation depletes soil nutrients,reduces microbial activity,and decreases organic matter,thereby affecting fruit quality.A field experiment was conducted to explore the effects of soil conditioner application combined with fertilization and water management on soil properties,organic carbon fractions,microbial biomass C/N,water-stable aggregates,and peach quality.Six treatments were designed:no fertilization(CK),farmers'conventional fertilization with regular water management(NPK+W),farmers'conventional fertilization combined with optimized water and fertilizer management(NPK+MW),soil conditioner application with regular water management(BGA+W),soil conditioner application combined with optimized water and fertilizer management(BGA+MW),and a combined treatment of 50%soil conditioner+50%conventional fertilizer with optimized water and fertilizer management(H-BGA+NPK+MW).The results showed that BGA+MW significantly reduced soil pH(6.96%-13.53%during fruit expansion;7.08%-16.77%at maturity),and increased nitrate-N(15.2%-310.7%)and ammonium-N(236.1%-315.5%).H-BGA+NPK+MW decreased soil bulk density(10.69%-11.36%during expansion;7.80%at maturity)and improved aggregate stability,with average weight diameter(MWD)and geometric mean diameter(GMD)increased by 32.3%and 100%(expansion)and 3.3%and 9.8%(maturity),respectively.Treatments enhanced organic carbon fractions and soil microbial biomass carbon.NPK+W increased soil organic carbon(SOC)by 31.77%compared with BGA+W during expansion,while H-BGA+NPK+MW showed the highest SOC at maturity.NPK+MW promoted microbial biomass carbon in expansion,and H-BGA+NPK+MW did in maturity.H-BGA+NPK+MW increased soluble solids,and BGA+MW increased soluble sugars.The BGA soil conditioner improves soil microbial activity,organic carbon fractions,and fruit quality in continuous cropping orchards,supporting sustainable production.