This chapter outlines soil water managementWater management practices in Korea, emphasizing the critical role of soil water in agriculture and environmental processes. Topics include the status of soil water, movement dynamics such as infiltration, percolation, and hydraulic conductivityHydraulic conductivity, and the use of water balance equations for efficient management. The analysis includes a comparison between different soil types, notably contrasting inland soils with the high organic matter content of Jeju Island’s volcanic ash soils. It discusses methodologies using automatic weighing lysimetersLysimeter(s) to track water and nutrient flows, key for determining crop coefficients and irrigation needs. Additionally, it covers the evaluation of saturated and unsaturated hydraulic conductivityHydraulic conductivity using the van Genuchten–Mualem model and classifies hydrologic soil groups based on permeability. These integrated approaches help optimize soil water use and inform agricultural practicesAgricultural practice(s) to enhance productivity and sustainabilitySustainability.