Abstract
Natinal Institute of Horticultural & Herbal Science, RDA, Jeju 690-150, Korea(Received September 27, 2014; Revised November 7, 2014; Accepted November 9, 2014)ABSTRACTDrought index can be used to implement an early warning system for drought and to operate adrought monitoring service. In this study, an approach was examined to determine agriculturaldrought index (ADI) at high spatial resolution, e.g., 270 m. The value of ADI was calculated based onsoil water balance between supply and demand of water. Water supply is calculated by the cumulativeeffective precipitation with the application of the weight to the precipitation from two months ago.Water demand is derived from the actual evapotranspiration, which was calculated applying a cropcoefficient to the reference evapotranspiration. The amount of surface runoff on a given soil type wasalso used to calculate soil residual moisture. Presence of drought was determined based on theprobability distribution in the given area. In order to assess the reliability of this index, the amount ofresidual moisture, which represents severity of drought, was compared with measurements of soilmoisture at three experimental between July 2012 and December 2013. As a result, the ADI hadgreater correlation with measured soil moisture compared with the standardized precipitation index,which suggested that the ADI would be useful for drought warning services.Key words: Agricultural drought index, Effective precipitation, Evapotranspiration, Runoff, Soilmoisture
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