Measurement of Soil Matric Potential using a Simple Soil Moisture Meter

Abstract

In this study, we aimed to determine a method for measuring soil matric potential using a simple soil moisture meter (SSMM) with a contact material, such as silt loam. Silt loam as a contact material ensured water continuity between the sensor of the SSMM and the soil, enabling it to function correctly. The SSMM indicator was consistent with measurements from a conventional soil water potential sensor; thus, the soil matric potential could be estimated across multiple fields with different soil types, with an RMSE accuracy of 61–203 kPa. These results demonstrate the potential of the SSMM to estimate soil matric potential below -50 kPa (above pF 2.7) and highlight its utility as a practical field-measuring instrument.