The Hormetic Response of Soil P Extraction Induced by Low-Molecular-Weight Organic Acids

The hormetic effect is a toxicological phenomenon in the soil ecosystem. influence of low-molecular-weight organic acids (LMWOAs) on release and activation phosphorus (P) has become focus research. To what extent LMWOAs can regulate P then nutrients worth attention. This study aimed to investigate effects different types concentrations exogenous extraction, establish relationship between concentration extraction efficiency, calculate parameters understand mechanism efficiency. Four acids, i.e., citric, oxalic, tartaric, malic induced that were dependent. efficiency was explained by quadratic polynomial equation. critical threshold citric acid similar oxalic acid, whereas tartaric acid. thresholds extracted higher than those due differences structure properties LMWOAs. lower other three types. These results provide evidence for use increase P.