Measuring Soil Moisture Content with Time Domain Reflectometry

Abstract

Time Domin Reflectory (TDR) is a method to measure the dielectric constant ( Ɛ ) which is the capacity ratio of insulated material and capacity of air used as an insulator. Lt relates directly to volume of soil moisture. The principle is to used as a rods after being injected in to the soil. The signal will be sent back to TDR and graph is shown for soil moisture content in term of percentage by volume.