Umudike Journal of Engineering and Technology

The calibration of the Delta-T Moisture Probe was performed using the gravimetric method as a standard. The variation of soil moisture with depth as determined by the moisture probe and the gravimetric method was analysed for different plots. Soil samples were obtained at different depths and the values obtained from the gravimetric method were compared with those from the Delta-T PR1/6 Moisture Probe. Calibration curves and general equations with respect to soil at different plots for calibrating the moisture meter were constructed and a general calibration equation for the Delta-T PR1/6 Moisture Probe was established. The corresponding generated values were determined from the established calibration equations. The corresponding R² values ranged between 0.8081 – 0.9470.  Thus, from the experiment, moisture probe predictions were high with a range between 80.8 – 94.7% of the variation captured by the gravimetric method. This investigation establishes the fact that the Delta – T Moisture Probe can be used to carry out soil moisture content determination at different depths on the field.