Summary
This five-year field experiment investigated whether six legume cover crop varieties, when intercropped with maize, produced equivalent effects on soil organic carbon and aggregate stability. Despite similar SOC gains across intercropping treatments, aggregate stability — measured as mean weight diameter — diverged significantly depending on the legume species used, suggesting that SOC accumulation alone does not determine structural soil outcomes. The study implicates differential enrichment of specific bacterial, fungal, and AMF taxa as a likely mechanism driving the divergent aggregate stability responses, contributing to understanding of how cover crop choice shapes soil physical and biological properties.
UK applicability
This study was conducted in China under a maize-based cropping system, so direct transferability to UK conditions is limited; however, the finding that legume cover crop species identity drives divergent soil aggregate stability outcomes — independent of SOC levels — is broadly relevant to UK agroecological practice, particularly for farmers and advisers selecting cover crop mixes to improve soil structure under arable rotations.
Key measures
Soil organic carbon (SOC, g/kg); mean weight diameter (MWD, mm) as measure of aggregate stability; bacterial community composition; non-AMF fungal community composition; arbuscular mycorrhizal fungal (AMF) community composition
Outcomes reported
The study measured soil organic carbon (SOC), soil aggregate stability (mean weight diameter), and bacterial, non-AMF fungal, and arbuscular mycorrhizal fungal (AMF) community composition across six maize–legume intercropping systems and a maize monoculture over five years. It assessed whether different legume cover crop varieties produced divergent outcomes in aggregate stability despite comparable SOC accumulation, and examined the microbial mechanisms underlying these differences.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.