Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 529266
Title Polymer tensiometers with ceramic cones: performance in drying soils and comparison with water-filled tensiometers and time domain reflectometry
Author(s) Ploeg, M.J. van der; Gooren, H.P.A.; Bakker, G.; Hoogendam, C.W.; Huiskens, C.; Koopal, L.K.; Kruidhof, H.; Rooij, G.H. de
Source Hydrology and Earth System Sciences Discussions 6 (2009)3. - ISSN 1812-2108 - p. 4349 - 4377.
Department(s) Soil Physics, Ecohydrology and Groundwater Management
SS - Soil Physics and Land Use
Publication type Refereed Article in a scientific journal
Publication year 2009
Abstract Measuring soil water potentials is crucial to characterize vadose zone processes. Water-filled tensiometers only measure until approximately -0.085 MPa, and indirect methods may suffer from the non-uniqueness in the relationship between matric potential and measured properties. Recently developed polymer tensiometers (POTs) are able to directly measure soil matric potentials until the theoretical wilting point (-1.6 MPa). By minimizing the volume of polymer solution inside the POT while maximizing the ceramic area in contact with that polymer solution, response times drop to acceptable ranges for laboratory and field conditions. Contact with the soil is drastically improved with the use of a cone-shaped solid ceramics instead of flat ceramics. The comparison between measured potentials by polymer tensiometers and indirectly obtained potentials with time domain reflectometry highlights the risk of using the latter method at low water contents. By combining POT and time domain reflectometry readings in situ moisture retention curves can be measured over the range permitted by time domain reflectometry.
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