This paper presents a mathematical modeling approach for simulating coupled salt and moisture transport in soil using a cross-diffusion system of equations. The study highlights the relevance of salinization and the disruption of the water-salt balance in agricultural land. The developed model captures the nonlinear interactions between moisture content and salt concentration, enabling the prediction of their spatial and temporal dynamics. Through practical case studies, including irrigated areas, the model's effectiveness is demonstrated in forecasting soil salinity and guiding sustainable soil and water management strategies.