[Objective] The effective mixing depth is an essential parameter for quantifying and predicting solute loss. It is of great significance to quantify the effective mixing depth of texture-differentiated soils and investigate the response of effective mixing depth to soil erosion, and solute loss in the modeling of agricultural non-point source pollution. [Methods] The topsoil of five texturally distinct dry croplands in the Danjiangkou Reservoir Region was selected as the research object. The bromine ion tracer method was employed to quantify the effective mixing depth and its dynamic changes in texturally distinct soils. Simulated rainfall tests were conducted according to different bromine application depths (0 cm ( soil surface), 0.5 cm, 1 cm, 2 cm, and 5 cm) to determine the process of soil erosion and solute loss and analyze the response to the effective mixing depth. [Results] Under the experimental conditions established in this study, the effective mixing depths during rainfall exhibited a range of 0.3.