The Terra Preta Model soil for sustainable sedentary yam production in West Africa
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Date
2023
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Publisher
Heliyon
Abstract
Current declines in yam yields amidst increasing cultivated areas, land scarcity, and population
surges call for more sustainable sedentary yam production systems. This study explored the nature of Amazonian Dark Earths (ADEs) as a basis for the formation of a related soil type known as
the Terra Preta Model (TPM) soil for future sedentary yam systems. It builds on the influence of
human beings in soil management and the formation of Anthrosols. Previous studies on the ADEs
and biochar were synthesized to establish the fundamental assumptions required to form the TPM
soil. The practical approach to forming the TPM soils is based on the intentional, integrated and
prolonged use of biochar, municipal solid wastes, agro-industry wastes and products of ecological
sanitation. Tillage options such as mounding, ridging, trenching and sack farming could be used
for yam production on the TPM soils. Unlike natural soils, the longevity of ADE fertility is subject
to debate depending on crops grown and cropping cycles. Therefore, a crop rotation plan is
recommended to maintain the fertility of the TPM soils. The TPM soils, if adopted, are considered
worthwhile for the long-term benefit of biodiversity conservation, efficient waste management,
enhanced ecosystem services provided by soils and extensive adoption of ecological sanitation.
Description
Research Article
Keywords
Amazonian dark earth, Biochar, Ecological sanitation