Competitive adsorption/desorption of dimethoate pesticide and phosphorus fertilizer in texturally different soils

This study aims to comprehend the competitive and non-competitive adsorption/desorption of phosphorus fertilizer and dimethoate insecticide in clay soil and clay loam soil. Characterization of the examined soils was the first step in the process, which was followed by agrochemical non-competitive adsorption, competitive adsorption, and desorption from the soil samples. Dimethoate was more absorbed than phosphorus, according to non-competitive experiments. The addition of phosphorus considerably reduced the dimethoate's adsorption capacity on the soils under test. The adsorption rates of dimethoate and phosphorus decreased to 7.21–7.82% and 9.59–9.02%, respectively, in the presence of both phosphorus and dimethoate in the clay and clay loam soils. Compared with adsorption, the desorption of the tested agrochemical into CaCl2 resulted in low values. These results highlight the environmental and public health importance of competition among agrochemicals.