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This paper presents the designing and construction of a resistive based soil moisture sensor using the Arduino UNO board. The low-cost sensor can be an effective device that can be used in determining and monitoring water content in the soil. The system is proposed to help farmers in agricultural applications. By knowing moisture content in the soil, farmers can determine the appropriate water needed for optimum growth of plants and improve irrigation planning thus increasing the overall crop productivity. Different soil test samples with different water content are taken for observing the variations in the values of the developed sensor. The sensor is found to meet considerable accuracy to a certain extent. The fusion of soil moisture models like the Dubois model is performed with the sensing device.