This study was conducted to determine the changes of some chemical characteristics of a dry paddy and mangrove soil sample when submerged in water for a 0 - to 10 - week’s period. The redox potential of the soils and the pH, EC, concentrations of cations (Na, K, Mg, Ca, Fe and Mn) and concentrations of nitrogen, phosphate and sulphate of the soil solutions changed due to submergence. The changes were most significant during the first two weeks of submergence.