Influence of organic matter on rheological properties of soil

A - Papers appearing in refereed journals

Markgraf, W., Watts, C. W., Whalley, W. R., Hrkac, T. and Horn, R. 2012. Influence of organic matter on rheological properties of soil. Applied Clay Science. 64, pp. 25-33.

AuthorsMarkgraf, W., Watts, C. W., Whalley, W. R., Hrkac, T. and Horn, R.
Abstract

Recently rheological methods have been used to investigate the mechanical properties of soil micro-structure. Rheological techniques provide a number of quantitative physically based measurements and offer a better understanding of how soil micro-structure behaves when subject to stress. Here a rotational rheometer with a parallel-plate measuring device was used to explore the viscoelastic properties of soil as a function of soil organic carbon (SOC). We used samples from the long-term experimental site at Broadbalk, Rothamsted, UK. Data from amplitude sweep tests (AST) with controlled shear deformation are reported as well as mineralogical data. In general, water content, and SOC content, in addition to soil texture, clay mineralogy, carbonate, and cations all have an effect on stiffness, structural stability, and shear behavior. Storage modulus G′ and loss modulus G″, yield point, the linear viscoelastic range (LVE), loss factor tan δ, and integral z characterize micro-structural properties of soil on the particle-to-particle scale. Long-term applications of farmyard manure (FYM) lead to a significant increase in soil organic carbon (SOC), in comparison with the application of ammonium nitrate in form of mineral NPK fertilizer and bare fallow. For wet soils, increased SOC provided greater resistance to deformation and improved soil elastic properties allowing greater deformation before a yield point was reached. In drier soils however, (− 6 and −15 kPa) this relationship was less clear. 

Year of Publication2012
JournalApplied Clay Science
Journal citation64, pp. 25-33
Digital Object Identifier (DOI)doi:10.1016/j.clay.2011.04.009
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeSEF
The Rothamsted Long-Term Experiments including Sample Archive and e-RA database [2012-2017]
Bio-physics of the soil-root interface
Mechanistic descriptions for organic matter turnover in planted soils
Publication dates
Online06 May 2011
Publication process dates
Accepted11 Apr 2011
PublisherElsevier
Elsevier Science Bv
Copyright licensePublisher copyright
ISSN0169-1317

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