The main objective was to evaluate to what extent
subsoil compaction on an arable clay soil (Stagnosol (Drainic))
may be alleviated after 5 years under the climate conditions
in South-East Norway. Therefore, field plots which had been
ploughed and under minimum tillage were compacted through
wheel impact (10x) with a 6.6 Mg wheel load. Samples were
taken from the ‘compacted’ and ‘non-compacted reference’ treatments
at depths of 40 and 60 cm both before and directly after
compaction and again 5 years later. The soil physical parameters
revealed that pre-compression stress, bulk density, air capacity,
air conductivity and saturated hydraulic conductivity at depths
of 40 and 60 cm were impaired by compaction, especially under
ploughed. After 5 years, bulk density and pre-compression stress
remained almost unchanged, while air capacity, air conductivity
and saturated hydraulic conductivity had increased at both the
40 and 60 cm depth on both plots as compared to the compacted
state and to R for the most part, indicating the recovery of the
soil structure in the subsoil. The compaction status evaluated by
the ‘compaction verification tool’ indicates the relative reduction
of ‘harmful soil compaction’ (after wheel impact) with a change
towards ‘slightly harmful compaction’ for the most part with an
as yet limited saturated hydraulic conductivity at both depths after
5 years.
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