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Organic acids could improve the phosphorus (P) availability through enhancing the release of inorganic phosphorus (P i ) in the soil. However, the effects of organic acids on the P i  release are still poorly understood, especially from soils with different organic matter contents. Here, a biochemically produced humic acid and P fertiliser were added to the soil to modify the content of the soil organic matter (SOM) and soil P, respectively. And then the soil samples were incubated at 25 °C for 30 days. The release of P i  fractions (such as H 2 O-P i , NaHCO 3 -P i , NaOH-P i , HCl-P i , and Residual-P) from the soils with different organic matter contents in the presence of citric, oxalic, and malic acids was evaluated using a sequential chemical fractionation method. The results showed that the release of the NaHCO 3 -P i , NaOH-P i , and HCl-P i  fractions also showed a decreasing trend with an increasing content of soil organic matter, and more NaOH-P i  than the other P i  fractions was generally released in the presence of organic acids. Considering the types of organic acids, oxalic acid and malic acid most effectively and least effectively released P i , respectively. The path analysis indicated that the NaOH-P i  release had the highest direct and indirect effects on the total inorganic P (TP i ) release. NaOH-P i  was, therefore, the most effective source of P i  in the Mollisols.

Organic acids promote phosphorus release from Mollisols with different organic matter contents