PRECISION AND ACCURACY OF TIME DOMAIN REFLECTOMETRY AND CAPACITIVE PROBES TO DETERMINE SOIL ELECTRICAL CONDUCTIVITY IN CRANBERRY PRODUCTION – TECHNICAL NOTE

A recent study suggests a sensitivity of cranberry to saline stress. Consequently, monitoring of soil electrical conductivity may help growers to identify areas where plants could be under stress due to salt deposits. We used two different types of probes, a time-domain reflectometry (TDR; model CS6...

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Bibliographic Details
Published in:Canadian Journal of Soil Science 2017-03, Vol.97 (1), p.31-37, Article CJSS-2016-0019
Main Authors: Samson, Marie-Élise, Caron, Jean, Pepin, Steeve, Parys, Benjamin, fortin, josee
Format: Article
Language:English
Subjects:
Accuracy
Calibration
Coefficients
Conductance
Cranberries
Electrical conductivity
Electrical resistivity
Environmental monitoring
Lysimeters
Pore water
Pores
Probes
Reflectometry
Regression analysis
Resistance
Salinity tolerance
Salt deposits
Sandy soils
Soil solution
Soil stresses
Soil suction
Soil water
Sondes
Time domain analysis
Vaccinium macrocarpon
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Summary:A recent study suggests a sensitivity of cranberry to saline stress. Consequently, monitoring of soil electrical conductivity may help growers to identify areas where plants could be under stress due to salt deposits. We used two different types of probes, a time-domain reflectometry (TDR; model CS645 probe) and a capacitive approach (model GS3 probe) to estimate electrical conductivity (EC) or conductance (G). The estimates were compared with measurements of EC in soil pore water using suction lysimeters in a sandy soil exposed to two different irrigation methods and a wide range of salt concentrations in a greenhouse. Linear regression analysis of TDR conductance versus measured EC in pore water gave coefficients of determination (R2) between 0.24 and 0.98 and required specific calibration to accurately reproduce the suction lysimeter EC values. The GS3 probes had higher R2 values, between 0.54 and 0.98, and were generally easier to work, gave a better accuracy, and had a regression slope not significantly different from 1, result better than with the TDR probes. For both probes, data averaging increased the accuracy in estimates of soil solution EC, as did specific calibration of the probes for the EC values value within the range of 0–5 dS m−1.
ISSN:0008-4271
1918-1841
1918-1833
DOI:10.1139/CJSS-2016-0019