Moisture monitoring can be carried out using frequency domain and time domain automatic monitoring equipment, with a three-point method (collection point depth of 10cm, 20cm, 40cm) for monitoring. The field monitoring accuracy of moisture monitoring equipment should meet the requirement of no more than 10% relative error (weight and moisture content) The applicable conditions for the automatic online monitoring equipment for soil moisture are shown in the table
Applicable conditions for automatic online monitoring equipment for soil moisture
| Serial number | monitoring method | is applicable to the scope and conditions |
| 1 | Time Domain Method (TDR) | It has the advantages of small size, light weight, accurate measurement data, short stability time, and no need for calibration. But the circuit is complex and the cost is high, requiring on-site connection and debugging. High frequency cables buried underground need protection to avoid damage and affect the accuracy of monitoring data |
| 2 | Frequency domain method (FDR) | Frequency domain method has the advantages of simplicity, safety, fast and accurate, continuous fixed-point, automation, wide range, few calibrations, and low price. Regular calibration of parameters is required |
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