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Increasingly limited global freshwater resources coupled with low water use efficiency (WUE) increases the need for water-saving irrigation technologies in agricultural production. Numerous studies have investigated the emerging water-saving irrigation technology of alternate partial root-zone drip irrigation (APDI) on crop yield and WUE. This study investigated the effects of lower soil water thresholds for alteration of the irrigation (LTAI) to the previously dry root-zone on tomato plant growth, yield, and irrigation water use efficiency (IWUE) under APDI in year 2016 with field plot area of 6.48 m². There were six APDI treatments coded as AS80, AS70, AS60 and AD80, AD70, AD60, indicating APDI under sufficient irrigation (S) or deficit irrigation (D) with LTAI controlled at 80 %, 70 % and 60 % field water capacity (FC) in the previously dry root-zone, respectively. In addition, conventional sufficient (CSD) and deficit …