Relationship between soil water content of a surface sandy soil and groundwater level in a study site in northeast Thailand
2008
Hamada, H.(Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki) | Sukchan, S.
In some areas of northeast Thailand, groundwater is confined by a clay layer, and the water level in wells drilled into the aquifer is above the ground surface, suggesting that water could be supplied from the aquifer to the surface soil and making it possible to cultivate crops with minimum irrigation. We measured the groundwater level in wells and the water content of the surface sandy soil during the dry season. In recharge areas, the soil water content was usually less than the depletion of moisture content for optimum growth in the dry season, and less than the permanent wilting point in the late dry season (from January), indicating that in these areas, irrigation would be required for the cultivation of crops. In the discharge areas, where the water level in wells drilled into the confined aquifer was higher than the ground surface, the soil water content was more than the depletion of moisture content for optimum growth throughout the dry season, indicating that in these areas it would be possible to cultivate crops with minimum irrigation during the dry season using natural upward flow.
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