Publication:
Examining the Contributions of Maize Shoots, Roots, and Farming Manure to Stable Soil Organic 2 Carbon Pools in Tropical Smallholder

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dc.contributor.authorNyamasoka-Magonziwa Blessing
dc.contributor.authorVanek Steven J.
dc.contributor.authorOjiem John O.
dc.contributor.authorFonte Steven J.
dc.date.accessioned2024-07-04T20:12:45Z
dc.date.issued2022
dc.descriptionArticle
dc.description.abstractContinuous inputs of organic matter are vital for sustaining soil organic carbon (SOC) and productivity of soils in smallholder crop-livestock systems. However, the dynamics of the different inputs i.e. maize shoots, roots and manure used are poorly understood. Along with organic inputs, use of mineral fertilizers can alter the nutrient stoichiometry of organic matter inputs and have implications for SOC turnover. This study sought to understand how maize-based inputs and alterations to nutrient stoichiometry contribute to stable SOC pools. We hypothesized that higher quality litter (i.e., manure) contributes more than maize residues to stable SOC pools and that N, P and S additions, designed to balance the stoichiometry of inputs to reflect the stable fine fraction of soil organic matter (C:N:P:S-10,000:833:200:143) results in greater SOC stabilization. We used a 13C natural abundance approach, where the C4 maize residues were incubated for 11 months to trace C stabilization into different SOC pools within a C3 soil. Contrary to our expectations,we observed greater recovery and stabilization of shoot-derived C (2 X more than manure and 1.63 X more than roots) in the mineral-associated organic matter (MAOM) fraction. Mineral N, P and S additions reduced new C recovery in MAOM by 40% compared to no mineral nutrient’s additions. Our study highlights the importance of residue retention as a strategy to maintain SOC and soil health in smallholder systems, and our results challenge the idea that nutrient additions increase C stabilization of added residues.
dc.description.sponsorshipMcKnight Foundation
dc.identifier.citationNyamasoka-Magonziwa, B., Vanek, S. J., Ojiem, J. O., & Fonte, S. J. (2022). Examining the contributions of maize shoots, roots, and manure to stable soil organic carbon pools in tropical smallholder farming soils. Geoderma, 425, 116049.
dc.identifier.urihttps://drive.google.com/open?id=1948smoW3DulPjnT0JrwebC4JOGXbSeTy
dc.identifier.urihttps://repository.nrf.go.ke/handle/123456789/1103
dc.language.isoen
dc.publisherElsevier B.V
dc.subject: mineral-associated organic matter
dc.subjectC stabilization
dc.subjectroot derived C
dc.subject13C natural abundance
dc.titleExamining the Contributions of Maize Shoots, Roots, and Farming Manure to Stable Soil Organic 2 Carbon Pools in Tropical Smallholder
dc.typeArticle
dspace.entity.typePublication

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