Summary
This 8-year field trial in arid Henan Province, China compared long-term sub-soiling tillage (30 cm depth) with conventional tillage (15 cm depth) to assess effects on soil physical properties and porosity throughout the soil profile. Sub-soiling tillage significantly increased macropores, mesopores, and total pores at shallow depths (0–35 cm), raised total porosity and equivalent porosity by 10.4% and 87.1% respectively at 0–60 cm, and substantially improved soil organic carbon, moisture retention, hydraulic conductivity, and aggregate stability whilst reducing bulk density. The findings suggest sub-soiling is an effective remediation strategy for alleviating plough-layer compaction and restoring soil physical function in intensively tilled arid regions.
UK applicability
The study's findings on sub-soiling benefits for breaking compacted plough layers and improving soil structure are potentially relevant to UK arable systems, where plough-layer compaction is also common. However, the arid climate conditions and specific soil types of Henan Province may limit direct transfer of quantitative findings; UK applications would require validation under higher-rainfall conditions and different soil textures.
Key measures
Soil pore distributions (macropores >1 mm, mesopores 0.16–1.0 mm, total pores >0.16 mm) by X-ray CT; total porosity (φ); bulk density (ρs); soil organic carbon (SOC); soil field moisture capacity (fc); available moisture content; saturated hydraulic conductivity (Ksat); proportion of macroaggregates (PMA); soil profile depth 0–100 cm
Outcomes reported
The study measured soil pore distributions (macropores, mesopores, total pores) via X-ray computed tomography, soil bulk density, organic carbon content, aggregate stability, field moisture capacity, available moisture content, and saturated hydraulic conductivity across a 0–100 cm soil profile over 8 years of sub-soiling tillage compared to conventional tillage. Results demonstrated significant improvements in porosity, water retention, hydraulic conductivity, and reduced soil compaction under sub-soiling management.
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