Abstract

A calibration method was developed for two FDR sensors (GS3 and POGO) in saline soil conditions with predominantly fine textures and electrical conductivities that fluctuate between 4.4 and 16.5 dS.m-1. The methodology included the use of infiltration trenches and the recording of the variation of the water content over time. The results showed that there is an overestimation of as a function of the salt content. The standard error obtained with the manufacturer’s calibration was 0.09 and 0.19 cm3.cm-3 for GS3 and POGO, respectively. After calibration, the standard error decreased to 0.04 and 0.05 cm3.cm-3, respectively. The R2 of the calibration equations for GS3 and POGO were 0.94 and 0.86 respectively, not being necessary a differentiated calibration by salinity ranges. The GS3 sensor performed better than the POGO in the salinity conditions encountered.