Precision agriculture is a farming management concept based on observing and responding to intra-field variations.\r\nOne of the most important soil properties in farming is soil moisture content and it is necessary to develop new technique for\r\nmeasuring this property in a precision farming system. This study investigates the measurement of moisture content in soil\r\nusing an on-site, easy to use and real-time acoustic wave system. The system consists of the propagation of acoustic waves\r\nsuch as sweep frequency sound wave (10-300 Hz) and multiple tone sound waves (120 Hz) through the soil. Some properties\r\nof these acoustic waves enable estimation of soil water content such as peak amplitude (A), total power (TP), total harmonic\r\ndistortion (THD) and signal to noise ratio (SNR). The results showed that the best model for estimating the soil moisture\r\ncontent was the model that expressed relationship between A and soil moisture content with R2 = 0.999 (using sweep frequency)\r\nand relationship between TP and soil moisture content with R2 = 0.999 (using multiple tone). It is argued that the change in\r\nthe sound characteristics related to the soil moisture content can be used for a continuous monitoring and control of irrigation of\r\ncrops.
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