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Performance of the Commercial WET Capacitance Sensor as Compared with Time Domain Reflectometry in Volcanic Soils

Instituto Canario de Investigaciones Agrarias (ICIA), Dep. Suelos y Riegos, Apdo. 60, La Laguna, 38200 Tenerife, Spain. The mention of trade or manufacturer names is made for information only and does not imply an endorsement, recommendation, or exclusion by ICIA-Agricultural Research Institute

View larger version (18K): [in this window] [in a new window]   FIG. 1. The WET Sensor's performance (a) to measure electrical conductivity (EC) at 25°C (25) in solutions with known EC, and to determine (b) dielectric constant (a') in nonsaline reference fluids, and (c) the influence of EC on the WET Sensor's dielectric constant reading in two saline solutions (Ceff is the coefficient of efficiency).

View larger version (18K): [in this window] [in a new window]   FIG. 2. Comparison between electrical conductivity () readings obtained with the WET Sensor and the time domain reflectometry (TDR) Trase System in Soils A, B, and C (Ceff is the coefficient of efficiency).

View larger version (10K): [in this window] [in a new window]   FIG. 3. Relationship between dielectric constant (a') and electrical conductivity () measured with the WET Sensor for determining the offset '=0.

View larger version (12K): [in this window] [in a new window]   FIG. 4. Correlation between electrical conductivity of the soil solution (w) observed in the Rhizon extractor samples and w predicted using Eq. [14], measured with the WET Sensor, and the soil water content determined by gravimetry (Ceff is the coefficient of efficiency).

View larger version (13K): [in this window] [in a new window]   FIG. 5. Comparison between electrical conductivity of the soil solution (w) measured in the Rhizon extractor samples (observed) and w estimated using the Hilhorst (2000) model (Eq. [5]; predicted). Goodness of fit criteria given for the WET Sensor only (Ceff is the coefficient of efficiency).

View larger version (13K): [in this window] [in a new window]   FIG. 6. Relationship between volumetric water content () and dielectric constant (a') observed with the WET Sensor and time domain reflectometry (TDR) in the volcanic soils studied. Solid lines indicate slope changes in the a'– trend at certain values, dc (arrows).

View larger version (18K): [in this window] [in a new window]   FIG. 7. Comparison between observed volumetric water content (, determined by gravimetry) and predicted soil water content using Eq. [19].