Prehistorically modified soils of central Amazonia: a model for sustainable agriculture in the twenty-first century

Summary

This paper examines Terra Preta (Amazonian dark earth) soils created by pre-Columbian populations, which contain approximately threefold higher soil organic matter, nitrogen and phosphorus, and 70 times more charcoal than adjacent tropical soils. The author argues that intentional generation of new Terra Preta sites could provide a sustainable agricultural model for the twenty-first century, simultaneously addressing food production, desertification, atmospheric carbon sequestration and tropical forest conservation. The analysis acknowledges the paradox that increased soil fertility may intensify agricultural pressure on remaining forests, requiring careful implementation.

Regional applicability

This study focuses on central Amazonia and tropical soil systems with limited direct applicability to United Kingdom farming conditions, where soil fertility and climate differ substantially. However, the principles of biochar soil amendment and organic matter enhancement derived from Terra Preta research have influenced regenerative agriculture practices globally, including in temperate regions such as the United Kingdom.

Key measures

Soil organic matter content, nitrogen concentration, phosphorus concentration, charcoal content (compared to adjacent infertile soils); potential for CO2 sequestration and agricultural yield sustainability

Outcomes reported

The study characterises the physical and chemical properties of pre-Columbian Terra Preta soils and proposes their intentional creation as a sustainable agricultural model. It evaluates the potential of Terra Preta soils to address food security, land degradation, carbon sequestration and biodiversity conservation simultaneously.

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