2009) that soil susceptibility to compaction increases with soil moisture.
Similar reduction in infiltration rate with increasing compaction has been reported previously (Dawidowski and Koolen 1987; Debicki et al.
Calculation of the maximum surface soil compaction per tractor shows that the large tractor had the highest compaction at 378 kPa, the small tractor the second highest at 235 kPa, and the medium tractor the lowest tyre compaction at 102 kPa.
Although the medium tractor had the lowest surface soil compaction (lowest of the front and rear tyre pressures), the average soil strength, infiltration rate, and bulk density reflected the weight on the tractor tyre, i.
076-cm-thick flakes exhibit similar trends, with the reduction in permeability being initially steep with increasing compaction ratio.
As the compaction ratio is increased, the available pathways for flow are reduced.
As the mats are further compressed to higher compaction ratios, the pathways available for flow are reduced and many are eliminated, thus lowering the permeability.