Summary
This global meta-analysis of 260 soil carbon and 1,970 crop yield studies demonstrates that the benefits of conservation agriculture (no-till) are strongly modulated by regional climate. Arid regions achieve the most favourable outcomes—simultaneous gains in soil carbon and crop yield—whilst humid regions typically show only soil carbon increases, and some colder regions experience both yield losses and soil carbon losses. The authors conclude that effective adoption of conservation agriculture requires careful regional climate assessment alongside site-specific management considerations.
UK applicability
The United Kingdom's temperate maritime climate resembles the 'more humid regions' category described in this analysis, where conservation agriculture may increase soil organic carbon but yield outcomes are less predictable. UK practitioners should not assume universal benefits and should conduct site-specific assessments, particularly regarding yield maintenance under no-till systems.
Key measures
Soil organic carbon (SOC) sequestration rates; crop yield changes; regional climate classification; paired comparisons of no-till versus conventional tillage systems
Outcomes reported
The study analysed paired comparisons from 260 studies on soil carbon changes and 1,970 studies on crop yield changes under no-till versus conventional tillage across different climatic regions. Results showed that climate zone significantly modulates the outcome of conservation agriculture adoption, with arid regions achieving both carbon sequestration and yield gains, whilst humid and colder regions showed different trade-offs.
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