Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

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dc.contributor.authorMusinguzi, Patrick
dc.contributor.authorTenywa, John Stephen
dc.contributor.authorEbanyat, Peter
dc.contributor.authorTenywa, Moses Makooma
dc.contributor.authorMubiru, Drake N.
dc.contributor.authorBasamba, Twaha Ali
dc.contributor.authorLeip, Adrian
dc.date.accessioned2021-12-02T21:12:38Z
dc.date.available2021-12-02T21:12:38Z
dc.date.issued2013
dc.description.abstractSoil organic carbon (SOC) is a potential soil fertility indicator for regulating nitrogen application in tropical farming systems. However, there are limited studies that have discussed SOC thresholds above or below which crop production could be diminished, or at which no or high response to nitrogen (N) application can be realized. This review explores the drivers of SOC concentration relevant for the establishment of thresholds. We further evaluate existing SOC thresholds for provoking no yield response or significant response to added N fertilizer. Key drivers for SOC concentration relevant in establishing thresholds are mainly climate, topography, texture, and land use management. Soil organic carbon threshold for sustaining soil quality is widely suggested to be about 2% below which deterioration may occur. For added N fertilizer management, specific SOC thresholds seem quite complex and are only valid after assuming other factors are non-limiting. In some soils, SOC levels as low as 0.5% result in fertilizer responses and soils as high as 2% SOC also respond to small N doses. Minimum SOC thresholds can be identified for a given soil type, but maximum thresholds depend on crop N requirements, crop N use efficiency and amount of N applied. However, there seem to exist critical total SOC ranges that could be targeted for optimal indigenous N supply and integrative soil functional benefits. These can be targeted as minimum levels in soil fertility restoration. In all, it is still difficult to establish a single minimum or maximum SOC threshold value that can be universally or regionally accepteden_US
dc.identifier.citationMusinguzi, P., Tenywa, J. S., Ebanyat, P., Tenywa, M. M., Mubiru, D. N., Basamba, T. A., & Leip, A. (2013). Soil organic carbon thresholds and nitrogen management in tropical agroecosystems: concepts and prospects.en_US
dc.identifier.issn1913-9063
dc.identifier.urihttps://nru.uncst.go.ug/xmlui/handle/123456789/173
dc.language.isoenen_US
dc.publisherconcepts and prospects.en_US
dc.subjectcritical level, soil organic carbon fractions, tropical soils, efficiency, yielden_US
dc.titleSoil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospectsen_US
dc.typeArticleen_US
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