Soluble salt accumulation (salinization) is usually associated with depressional landscape positions, such as playas, and a source of saline ground water. Saline accumulations such as sulfates and chlorites of Ca, Mg, K, and Na are also associated with some irrigated agricultural areas. The accumulation of Na salts is called solodization. The accumulation of salts is often associated with a natural or artificially high water table (irrigation) feeding capillary water to, or near to the soil surface where salt accumulates upon evaporation. Salinization of irrigated agricultural areas in semi-arid and arid areas is a problem that has plagued the human race since the dawn of 'civilization'.