<![CDATA[Coastal alluvial paddy soils exhibit chemical characteristics influenced by hydrological dynamics, sedimentation processes, and the interaction between seawater and freshwater. Assessing the dynamics of soil chemical properties in both surface and subsurface layers is essential to understand the vertical distribution of nutrients, identify potential nutrient losses or accumulation, and support more accurate and sustainable soil fertility management. This study aimed to analyze the correlation between soil chemical properties in the topsoil (0–20 cm) and subsoil (20–50 cm) of coastal alluvial paddy soils. The parameters analyzed included pH H₂O, pH KCl, electrical conductivity (EC), cation exchange capacity (CEC), base saturation, total nitrogen, and exchangeable cations (Ca, Mg, K, and Na). Correlation analysis was conducted using statistical tests at a 5% significance level. The results showed significant correlations between soil chemical properties in the topsoil and subsoil, indicating strong vertical nutrient dynamics within the soil profile. In the topsoil, pH plays a key role in controlling phosphorus availability and cation balance, while in the subsoil, pH and salinity more strongly influence CEC, base saturation, and exchangeable cations. In addition, topsoil properties such as organic carbon and total nitrogen are associated with nutrient distribution in the subsoil through leaching and water movement processes. These findings provide important insights for improving sustainable soil fertility management in coastal paddy fields.]]>
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