A non-invasive experiment for root zone monitoring using electrical resistivity imaging

This paper presents a comprehensive study on the use of Electrical Resistivity Imaging (ERI) for non-invasive monitoring of the root zone, focusing on an infiltration experiment with a lemon tree in a controlled outdoor environment in Dhahran, Saudi Arabia. Over seven months, the study employed 3D and 4D ERI methods to capture root activity and distribution under realistic weather, soil, and water conditions. Findings include the detection of a resistive anomaly in the root zone extending to 50 cm depth, influenced by high summer temperatures which distorted resistivity signatures. Heterogeneous water infiltration was evident, with lateral resistivity variations and preferential flow paths during irrigation. Ground-truthing validated the root zone's geometry, confirming the imaging results. The study underscores ERI's potential for precision agriculture. This innovative approach underscores the potential of 3D and 4D ERI methods in enhancing precision agriculture and environmental management practices.