Summary
This 8-year field trial in an arid region of Henan Province, China compared long-term sub-soiling tillage (30 cm depth) with conventional tillage (15 cm depth) to assess remediation of soil compaction and plough layer formation. Sub-soiling significantly increased soil pore numbers, porosity, water-holding capacity, and saturated hydraulic conductivity whilst reducing bulk density across depths of 0–60 cm, with marked improvements in macropore and mesopore structure in the upper 0–20 cm layer. The findings suggest sub-soiling is an effective mechanical intervention for restoring soil physical properties and supporting root penetration and water transport in degraded soils.
UK applicability
The study was conducted in an arid region of China with distinct pedoclimatic and management contexts; applicability to UK conditions would depend on local soil type, rainfall patterns, and existing tillage practices. Deep sub-soiling has been investigated in UK arable systems but effects may vary with higher-rainfall, temperate climates and different crop rotations.
Key measures
Macropore (>1 mm), mesopore (0.16–1.0 mm), and total pore (>0.16 mm) numbers and distribution; total porosity (ϕ); bulk density (ρs); soil organic carbon (SOC); proportion of macroaggregates (PMA); field moisture capacity (fc); available moisture content; saturated hydraulic conductivity (Ksat)
Outcomes reported
The study measured soil pore distributions (macropores, mesopores, total pores) via X-ray CT, soil porosity, bulk density, organic carbon content, aggregate stability, moisture capacity, and saturated hydraulic conductivity across a 0–100 cm soil profile after 8 years of sub-soiling tillage compared to conventional tillage.
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