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The presence of calcium carbonate (CaCO 3 ) in soil plays an essential role in regulating many processes whether chemical, physical, or biological. The effect of calcium carbonate content on the adsorption and desorption characteristics of insecticides (chlorantraniliprole, CAP, dinotefuran, DNF) and herbicides (bispyribac-sodium, BPS, metribuzin, MBZ) in calcareous soil has been studied. Adsorption and desorption isotherms of tested pesticides were quantified using the batch equilibration technique. The data were modeled with the Freundlich model to obtain the adsorption parameters. The results showed that the adsorption of DNF and BPS was the highest in intact calcareous soil (IS), while the adsorption of CAP and MBZ was the highest in calcium carbonate free calcareous soil (FS). The desorption from IS and FS was highest for MBZ, whereas it was lowest for BPS. Therefore, we demonstrate that the soil calcium carbonate could block the adsorption sites available for certain pesticides like CAP and MBZ, while it could be shared in the adsorption of other pesticides like DNF and BPS.

Effect of Calcium Carbonate Content on Potential Pesticide Adsorption and Desorption in Calcareous Soil