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Concentration of organic acids secreted by W134 under different phosphorus source conditions. ACA: Acetic acid; ASA: Ascorbic acid; CA: Citric acid monohydrate; FA: Formic acid; LA: L-(+)-Lactic acid; MA: L-(−)-Malic acid; PA: Propionic acid; SA: Succinic acid; TA: DL-Tartaric acid. The different letters indicate that the data of the same row are significantly different at the 0.05 level. A: soluble P; B: insoluble P; C: lacking P.
