Organic Farming Research Reveals Key to Sustaining Soil Health

Strategic Insights -

New research from Dalhousie University sheds light on the factors that influence soil health in intensive organic cropping systems. A three-year study conducted on certified organic farms in Quebec, Canada, found that increased crop diversity and reduced tillage intensity are key drivers of soil health. The study, which examined the impact of varying management practices on soil health, suggests that farmers can maintain soil health by choosing and refining best management practices.

Key Takeaways:

  • The ability of organic cropping systems to sustain soil health may vary with management intensity, with little research examining the impact of varying management practices on soil health within intensive organic field crop production systems.
  • The Crop Diversity Index (CDI) is a key indicator of soil health, with higher CDI values observed where cover crops were used annually and winter cereals were included in the rotation.
  • Soil physical health indicators were positively influenced by higher CDI values, while higher Soil Tillage Intensity Ratings had a negative effect on soil organic carbon concentrations.
  • Soil health indicators did not vary among crop phases, except for water-stable aggregates (WSA), which were greater in small grain fields than in soybean fields.
  • The study found that increased crop diversity and reduced tillage intensity are key drivers of soil health, with the results informing best management practices for organic growers.

Statistics:

  • The 3-year Crop Diversity Index (CDI) ranged from 2 to 16 across the sampled fields, with the highest values observed where cover crops were used annually and winter cereals were included in the rotation.
  • Soil physical health indicators were positively influenced by higher CDI values, with a 43.5% increase in water-stable aggregates (WSA) observed in small grain fields compared to soybean fields.
  • Higher Soil Tillage Intensity Ratings had a negative effect on soil organic carbon (SOC) concentrations.
  • The study involved 10 certified organic farms in Quebec, Canada.

Sources:

  • Cropping diversity is a main driver of soil health under intensive organic cropping systems. Geoderma, 2025, 461():117441.
  • Geoderma publisher: Elsevier.
  • A free version of the journal article is available at https://doi-org.sdpl.idm.oclc.org/10.1016/j.geoderma.2025.117441.