Journal
SOIL & TILLAGE RESEARCH
Volume 209, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.still.2021.104975
Keywords
Compressibility; Deviatoric stress; Critical state; Triaxial compression; Effective stress; Soil organic matter (SOM); Soil organic carbon (SOC)
Categories
Funding
- UK Biotechnology and Biological Sciences Research Council under the National Capabilities programme grant [BBS/E/C/000J0300]
- Lawes Agricultural Trust
- BBSRC [BBS/E/C/000J0300] Funding Source: UKRI
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The study found that soil organic carbon content had a significant impact on the consolidation behavior of soil. The compression index was independent of SOC, but the void ratio showed a strong correlation with organic carbon content. The plastic limit test is a useful and simple method for comparing soil physical behavior and expected soil density.
We investigated the effect of soil organic carbon (SOC) on the consolidation behaviour of soil from two long term field experiments at Rothamsted; the Broadbalk Wheat Experiment and Hoosfield Spring Barley. These experiments are located on soil with similar particle size distributions, and include treatments with SOC contents ranging from approximately 1?3.5 g/100 g. Soils taken from plots with contrasting SOC contents were compressed and deformed in a triaxial cell and the normal consolidation and critical state lines were determined. We found that the compression index was independent of SOC, but the void ratio at any given effective stress was highly correlated with organic carbon content. By comparison with uniaxial compression data, the apparent influence of SOC on the compression index is likely to be due to its effect on soil hydraulic properties rather than any intrinsic effects of strength. The plastic limit test appears to be a useful and simple test to allow direct comparison of soil physical behaviour and expected soil density.
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