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The British Society of Soil Science is a UK based charity which promotes the study and profession of soil science.
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ALT This study assessed SOC stocks, POM, MAOM, organic functional groups and soil biological activity at two sites where soybean was grown annually in the main season, followed by different second-season systems. The mix of cover crops, which combined greater residue input with more diverse aboveground biomass quality, was associated with a more chemically diverse organic matter pool, higher biological activity and greater POM. The cover crop mix increased POM by 53%, while MAOM responses varied according to site and soil depth. Structural equation modelling indicated positive associations among aboveground biomass, soil biological activity, MAOM and SOC stocks. The findings provide field-based evidence that diverse cover crops can enhance soil carbon accrual in tropical agroecosystems.