Soil moisture calibration of TDR multilevel probes

Scientia Agricola

Daniel Serrarens²  Jim L. Macintyre²  Jan W. Hopmans²  Luis H. Bassoi¹ 

[1] ,University of California Department of Land Air and Water Resources, Hydrology ProgramDavis CA ,USA

关键词: TDR;    soil water content;    neutron probe;    TDR;    sonda;    água do solo;    neutron;   

DOI  :  10.1590/S0103-90162000000200024

来源: SciELO

【 摘 要 】

Time domain reflectometry (TDR) probes are increasingly used for field estimation of soil water content. The objective of this study was to evaluate the accuracy of the multilevel TDR probe under field conditions. For this purpose, eight such TDR probes were installed in small plots that were seeded with beans and sorghum. Data collection from the probes was such that soil moisture readings were automated and logged using a standalone field unit. Neutron probe measurements were used to calibrate the TDR probes. Soil-probe contact and soil compaction were critical to the accuracy of the TDR, especially when a number of TDR probes are combined for a single calibration curve. If each probe is calibrated individually, approximate measurement errors were between 0.005 and 0.015 m³ m-3. However, measurement errors doubled to approximately 0.025 to 0.03 m³ m-3, when TDR probes were combined to yield a single calibration curve.

【 授权许可】

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