To establish a monitoring method for soil moisture and salinity levels in reclaimed agricultural field covered in plastic sheeting, the daily variations in volumetric water content (θ) and bulk electrical conductivity (σ_b) of the bed were monitored by employing time domain transmissometry (TDT) sensors, which were horizontally installed at three different depths (5 cm, 15 cm, and 25 cm). The electrical conductivity of pore-water (σ_w) and saturation extract (σ_e), matric potential (ψ_m), and osmotic potential (ψ_o) were then estimated from the θ and σ_b obtained. The θ at 5 cm depth could not be estimated because it was below the lower limit of detection for θ measurements using the TDT sensors. However, the values of θ, σ_b and their derived estimates (σ_w, ψ_m, ψ_o, and σ_e) at depths of 15 cm and 25 cm were successfully determined during the entire monitoring period, and potential yield reduction due to excess salinity was reported. Although further modifications of the foregoing approach are required to determine all parameters near the surface of low- and moderate-moisture soil, the proposed approach can aid in controlling moisture and salinity levels at the root zone.