NDLI: Laboratory evaluation of dual-frequency multisensor capacitance probes to monitor soil water and salinity

Content Provider	Springer Nature Link
Author	Starr, J. L. Timlin, D. J. Downey, P. M. McCann, I. R.
Copyright Year	2009
Abstract	Real-time information on salinity levels and transport of fertilizers are generally missing from soil profile knowledge bases. A dual-frequency multisensor capacitance probe (MCP) is now commercially available, for sandy soils, to simultaneously monitor volumetric soil water content (VWC) measured as a percentage and salinity as a unitless volumetric ion content (VIC). The objectives of this research were to assess the relationship of salinity and water content with these dual-frequency MCPs under laboratory conditions, and assess its potential for field use in sandy soils of the mid-Atlantic region of the US. Water and salinity studies were conducted in two sand-filled PVC columns, 1.2 m long by 0.25 m ID. Each column was instrumented with ten dual-frequency capacitance sensors and two thermocouple temperature sensors. Four salinity levels were studied in the two columns using 0.5, 1, 2, and 4 dSm−1 NH4NO3 solutions. Water, salinity, and temperature readings were continuously recorded at 1-min intervals. The VIC values were found to be primarily qualitative, but combined with real-time VWC measures the probe could still be an important fertigation management tool to provide near-continuous real-time information on fertilizer penetration, spread and subsequent changes during crop growth.
Starting Page	393
Ending Page	400
Page Count	8
File Format	PDF
ISSN	03427188
Journal	Irrigation Science
Volume Number	27
Issue Number	5
e-ISSN	14321319
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-04-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Climate Change Sustainable Development Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Environment Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Water Science and Technology

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