Long term cover cropping improves soil water holding capacity in semiarid vineyards (Spain)
In a 2026 study by María José Marqués and colleagues, conducted across semiarid vineyards and olive groves in central Spain, decade-long cover cropping significantly improved soil water-holding capacity and overall soil health resilience under Mediterranean dryland farming conditions.
Headline Findings:
- Higher soil water holding capacity after long-term cover cropping.
- Increased soil organic carbon and better soil structure.
- Improved aggregation and porosity helped soils capture and store rainfall.
- Benefits were consistent across both vineyards and olive groves.
- Results suggest cover crops can improve drought resilience in Mediterranean dryland agriculture.
Methods:
Compared long-term cover-cropped fields with conventionally managed bare-soil controls in semiarid Mediterranean vineyards and olive groves.
Study sites had roughly a decade of cover-crop management.
Measured key soil properties including:
– soil water holding capacity
– soil organic carbon
– bulk density
– porosity
– and aggregate stability
Soil samples were collected from different depths and analyzed in the lab.
Researchers statistically compared soil physical and hydraulic properties between management systems to assess long-term effects of cover cropping.
Results:
- Cover cropping increased soil water holding capacity.
- Soil organic carbon and soil structure improved.
- Greater porosity and aggregate stability enhanced water retention.
- Effects were strongest in topsoil and consistent in both vineyards and olive groves.
Limitations and Considerations:
- Findings are specific to semiarid Mediterranean vineyards and olive groves, so results may not fully generalize elsewhere.
- Cover crops can compete with vines/trees for water during very dry years.
- Benefits depended on long-term management (~10 years), so improvements may take time to appear.
- Outcomes may vary with cover crop species, soil type, and rainfall patterns.
Read the original study here.
