Effects of Three Inorganic Amendments on Stabilization of As and Pb in Heavy Metal Contaminated Paddy Soil

Many soil amendments are used to remediate paddy soils polluted with heavy metals, including arsenic (As) and lead (Pb). This study was conducted assess the efficacy of three inorganic amendments, such as calcium carbonate (CaCO3), sulfate (CaSO4), ferrous (FeSO4), on As Pb co-contaminated soils. The were applied alone and/or in combinations compare theirs for stabilization rice growth. In addition, two single extraction methods, 1 M ammonium nitrate (NH4NO3) Mehlich-3, effects immobilization using amendments. (CaSO4 FeSO4) combined (CaCO3 + CaSO4, FeSO4 CaCO3, CaSO4) amendment treatments significantly decreased extractable concentrations NH4NO3 Mehlich-3 treated soil. Furthermore, treatment indicated maximum reduction concentration by increased both extractions soil, but no significant differences observed CaSO4 treatments, relative untreated (As soils). Shoot dry weight (DW) plants slightly application compared that However, leaf sheath reduced 21 - 41% difference blade control. On other hand, (1:1) blade, all organs Therefore, can be a feasible approach alleviating stress reducing affect accumulation soils.As (A B) (C D) extracting solution Mehlich3 affected FeSO4, CaCO3 (1:1), (2:1), before transplanting seedlings. Mehlich3-extractable measured at 6 12 weeks after transplant (WAT) seedlings, respectively. Means denoted same letter not different p < 0.05 level according Fisher’s least (LSD) test.