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Soil organic carbon fractions in a long-term experiment and the potential for their use as a diagnostic assay in highland farming systems of Central Kenya


, : Soil organic carbon fractions in a long-term experiment and the potential for their use as a diagnostic assay in highland farming systems of Central Kenya. African Crop Science Journal 6(1): 19-28

Soil organic carbon (SOC) pools were measured and compared to crop performance during the eighteenth year of a long-term field experiment established on a Humic Nitisol at the Kenya Agricultural Research Institute. Maize stover retention (+or-S), cattle manure (+or-M, 10 t ha-1 yr- 1) and fertilizer inputs (+or-F, 120 kg N and 23 kg P ha-1 yr-1) were compared in a 2x3 factorial arrangement in a manner that is broadly reflective of farmer resource management options.

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