Summary
This meta-analysis of 166 peer-reviewed articles examined the sensitivity of soil microbiological and physico-chemical indicators to six sustainable farming practices in arable systems. The authors found that soil clay content, organic matter, pH, trial duration and sampling depth significantly modulate indicator responses, whilst climatic factors did not. Both physico-chemical and microbiological indicators were sensitive to organic matter input, residue retention, cover crops and reduced tillage, with cover cropping producing notably strong responses (SOC +7%, STN +8%, MBC +14%, PLFA +19%, β-GLU +11%), whereas crop rotation and organic conversion showed microbiological but not organic carbon responses.
UK applicability
The findings on indicator sensitivity to sustainable farming practices are broadly applicable to UK arable systems, though UK conditions (typically cooler, wetter, and with variable soil textures) would be represented within the meta-analysis's pedoclimatic range. The recommendation to integrate microbiological indicators into routine soil testing could inform UK advisory frameworks and agri-environment monitoring schemes.
Key measures
Soil organic carbon (SOC), soil total nitrogen (STN), microbial biomass carbon (MBC), total phospholipids fatty acids (PLFA), β-glucosidase (β-GLU) activity; response ratios across exogenous organic matter input, crop residue retention, cover crops, crop rotation/diversification, tillage reduction, and conversion to innovative/organic systems
Outcomes reported
The study quantified the sensitivity of soil microbiological indicators (microbial biomass carbon, phospholipid fatty acids, β-glucosidase) and physico-chemical measures to six sustainable farming practices across 166 articles. It identified which indicators respond to specific management transitions and which soil, climate and methodological factors modulate these responses.
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