Summary
This global meta-analysis of 3160 observations synthesised evidence on cover crop performance across 271 studies, demonstrating that legume cover crops increased soil organic carbon by 5.9% and crop yield by 16.0%, though with a trade-off of 36.2% higher nitrous oxide emissions. The authors identify context-dependent effectiveness, showing greatest benefits in low-input cereal systems with low initial soil carbon under humid warm climates, and propose mitigation strategies including no-tillage, deficit irrigation, and diversified rotations to address emission concerns whilst capturing soil and yield co-benefits.
UK applicability
The UK's cooler, temperate climate differs from the humid warm conditions identified as optimal for legume cover crops, potentially limiting yield benefits. However, findings on integrating cover crops with conservation tillage and diverse rotations may inform UK sustainable intensification strategies, particularly for improving soil carbon in intensive cereal-dominated arable systems.
Key measures
Soil organic carbon (% change), crop yield (% change), nitrous oxide emissions (% change)
Outcomes reported
The study quantified the effects of legume and non-legume cover crops on soil organic carbon accumulation, crop yield, and nitrous oxide emissions across multiple farming contexts. Results were stratified by farming system characteristics including nitrogen fertiliser use, crop diversity, initial soil carbon status, and climate.
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