Calibration of a capacitance probe in a Paleudult
DOI:
https://doi.org/10.1590/S0103-90162007000600012Keywords:
FDR probe, sensor, irrigation, soil water contentAbstract
The use of capacitance sensors is one of the methods used to quantitatively measure soil water contents (theta, m³ m-3). Sensors provide readings at desired depths and time intervals. A capacitance probe (Diviner 2000) was calibrated for a Rhodic Paleudult from the Piaui State, Brazil. Six access tubes were installed in a 5 × 2 m grid arrangement. Three moisture levels (saturated, moist and dry) were used in two replications. Probe readings and soil samplings to determine theta were made at 0.1 m depth intervals down to a depth of 1.0 m. A power calibration equation was developed for each depth as well as for the entire soil profile (Root Mean Square Error = 0.014, R² = 0.93) for a theta range of 0.068 to 0.264 m³m-3. A separate calibration for each depth improves the correlation coefficient and minimizes RMSE. Site-specific calibration improves the accuracy for soil water monitoring.Downloads
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Published
2007-12-01
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Calibration of a capacitance probe in a Paleudult . (2007). Scientia Agricola, 64(6), 636-640. https://doi.org/10.1590/S0103-90162007000600012