A novel approach to estimate soil penetrometer resistance from water content, bulk density, and shear wave velocity: A laboratory study on a loamy sand soil

A - Papers appearing in refereed journals

Zhang, W., Gao, W., Ren, T. and Whalley, W. R. 2020. A novel approach to estimate soil penetrometer resistance from water content, bulk density, and shear wave velocity: A laboratory study on a loamy sand soil. Geoderma. 368 (1 June), p. 114276. https://doi.org/10.1016/j.geoderma.2020.114276

AuthorsZhang, W., Gao, W., Ren, T. and Whalley, W. R.
Abstract

Continuous estimates of penetrometer resistance (Q) would be useful in root elongation and in soil management studies. However, penetrometers produce estimates of penetration resistance at discrete time points. In this paper, a method with the potential to provide continuous estimates of penetrometer resistance is developed. We use measurements of soil water content, shear wave velocity (Vs) determined from piezo electric devices, and bulk density (ρb) determined with the heat pulse (HP) method, to estimate penetrometer resistance. Soil samples of a loamy sand were packed into cylinders with axial pressures of 50, 100, and 200 kPa, and allowed to equilibrate at matric potentials of −2, −6, −10, −30, −100, −300, and −500 kPa. Thermal conductivity (λ), Vs and Q were measured after equilibration. A λ-based approach was applied to estimate ρb, and small strain shear modulus (G) was calculated from ρb and Vs. Our results confirmed a linear relationship between Q and G (where G = Vs2ρb), which provides a basis to estimate penetrometer data in the field using buried sensors and a physically based model.

KeywordsPenetrometer resistance; Bulk density; Thermal Conductivity; Small strain shear modulus; Prediction
Year of Publication2020
JournalGeoderma
Journal citation368 (1 June), p. 114276
Digital Object Identifier (DOI)https://doi.org/10.1016/j.geoderma.2020.114276
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Natural Environment Research Council
Funder project or codeDesigning Future Wheat (DFW) [ISPG]
ASSIST - Achieving Sustainable Agricultural Systems
Output statusPublished
Publication dates
Online28 Feb 2020
Publication process dates
Accepted18 Feb 2020
PublisherElsevier Science Bv
ISSN0016-7061

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