Internal structure of tilled soil

Summary

Dexter developed a quantitative method for characterising the three-dimensional internal structure of tilled soil by impregnating samples with paraffin wax, sectioning them, and analysing void and aggregate distributions using tools from communications theory. He found that aggregate–void angle distributions were isotropic and demonstrated differences in soil tilth produced by three common tillage implements, with structural changes observable at different depths and time points post-tillage. The transition probability framework presented enables stochastic simulation of soil structure at larger scales and offers a general methodology for studying soil structural features across different spatial resolutions.

Regional applicability

This foundational work was conducted in the United Kingdom and describes methods directly applicable to UK arable practice. The comparative assessment of mouldboard plough, tine cultivator and rotary cultivator reflects common UK tillage systems; findings on structural change with depth and time remain relevant to understanding how UK soil management affects workability and soil properties.

Key measures

Angular distributions of void–aggregate interfaces; transition probabilities (16-state Markov chain); soil structure at 1–5 mm scale; temporal and depth-dependent changes in tilth

Outcomes reported

The study characterised the internal structure of tilled soils by quantifying void and aggregate distributions at 1–5 mm scale using paraffin wax impregnation and sectioning. Differences in soil tilth were observed among three tillage implements (mouldboard plough, tine cultivator, rotary cultivator), with structural changes over depth and time post-tillage.

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