The effects of magnetic water and soil texture on the measurement accuracy of water content by TDR device

Soil moisture is one of the important determinants of soil behavior in water and soil investigation. The usual methods of measuring soil moisture are costly and very time consuming; so in this study, the TDR device has been used as a fast method. This study aims to investigate the effect of magnetic irrigation water on the measurement accuracy of the water content of the soil by the TDR device. In this study, three soil texture (silty clay, sandy loam, and clay loam) were on different levels of the magnetic field (0, 0.3, and 0.6 T). In this study, soil moisture was estimated using a TDR and compared with volumetric method values of soil moisture. The results showed that the device has the highest accuracy in the sandy loam soils under different levels of magnetic irrigation water (RMSE in well water, magnetic water 0.3 teslas, and magnetic water 0.6 teslas were 15.2, 3.3, and 2.5, respectively) and by increasing the clay content, the accuracy of the device is reduced. The drawing of the coherence chart between the results of the TDR method and the volumetric method values showed that the highest and the least coincidence between the two methods were observed in sandy loam + irrigation with magnetic water of 0.6 T (R2 = 0.92) and clay loam soils + well water (R2 = 0.42). The results showed that irrigation with magnetized water was increased the accuracy of the device in all of the studied soil textures.