Summary
This global meta-analysis, published in Global Change Biology, synthesises findings from multiple primary studies to quantify the effect of cover cropping on soil organic carbon and nitrogen dynamics across diverse agroecological contexts. By pooling data from studies worldwide, the paper provides robust estimates of average effect sizes and examines moderating factors such as cover crop functional type, climate zone, and duration of practice. The findings are likely to indicate that cover crops consistently, if modestly, increase soil organic carbon and improve nitrogen retention, with variation depending on local conditions and species selection.
UK applicability
Although the meta-analysis is global in scope, its findings are broadly applicable to UK arable systems, where cover cropping is increasingly promoted under agri-environment schemes and the Sustainable Farming Incentive; UK practitioners should note that effect sizes may differ from global averages given the UK's temperate maritime climate and relatively short cropping windows.
Key measures
Soil organic carbon (g/kg or %); soil total nitrogen; effect size estimates (Hedges' d or response ratios); cover crop biomass; number of studies/observations per outcome
Outcomes reported
The study synthesised evidence on the effects of cover crops on soil organic carbon, soil nitrogen, and related soil health indicators across a range of farming contexts. It likely reported effect sizes for soil carbon accumulation and nitrogen cycling as a function of cover crop species, climate, and management.
Topic tags
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