The salt presence property of soil refers to the concentration of soluble salts, such as sodium, calcium, and magnesium, within the soil profile. High salt levels can lead to soil salinity, negatively affecting plant growth by altering water availability and soil structure. The presence of salts is typically measured using electrical conductivity (EC) or specific ion concentration tests. Soils with high salt presence are often found in arid regions where evaporation exceeds precipitation, leading to salt accumulation at or near the surface. Source: Rhoades, J.D., & Kandiah, A. (1992). Soil Salinity Management in Agriculture. Springer.