It can be seen that the capacitance method may have great potential in dynamically capturing soil/soilless substrate water content practically. In fact, many commercially available capacitive moisture sensors, especially ECH2O dielectric aquameter (Decagon Devices, Pullman, WA, USA Inc.), have received significant attention in the field [16] [17] [18] [19] and laboratory applications [17], [20], [21] by scholars.