溶磷菌Rs-5介导生物炭缓释磷肥磷素溶解与缓释效能调控机理OA

In order to improve soil phosphorus use efficiency,it is crucial to develop sustainable strategies for slow release of phosphorus fertilizers.The biochar slow-release phosphate fertilizers loaded phosphorus solubilizing bacteria Rs-5 prepared by regulating H3PO4 addition with pome-granate branches and Ca3(PO4)2 using the co-pyrolysis method can accurately regulate the release of phosphorus,and Rs-5 can promote the release of insoluble phosphate solubilized in the BSR-PFs,and the biochar-based bacterial preparation can be used as a slow-release phosphorus fertiliz-er to steadily provide phosphorus source for the soil.The results showed that the dissolved phos-phorus amount of Rs-5 reached 389.24 mg/L,with excellent phosphorus solubilization efficiency,and it could grow normally and be evenly distributed under the condition of BSRPFs.The higher the dosage of H3PO4,the higher the specific surface area of BSRPFs,which provided more ad-sorption sites and was more suitable for the adsorption of Rs-5,and the more biocompatibility was excellent with Rs-5.The surface functional groups of the biochar-based bacterial fertilizer were a-bundant,generating Ca-P metal composite crystals,such as Ca8H2(PO4)3(OH),etc.,indicating that its structure has good slow-release properties.The larger the amount of H3PO4 added,the higher the amount of dissolved phosphorus in the co-cultivation of BSRPFs with Rs-5,the better the ability to dissolve insoluble phosphate,and the higher the amount of phosphorus release from the prepared biochar-based bacterial fertilizer was,up to 15.94 mg/g.The release model was con-sistent with the proposed secondary kinetics and Elovich model.