Neina, D., Glaser, B. Terra PretaTerra preta, meaning “black earth” in Portuguese, is a type of highly fertile soil found in the Amazon Basin. It is characterized by its high biochar content, which contributes to its long-term fertility and ability to support productive agriculture More production from Ghanaian and Zambian soils using domestic wastes. Sci Rep14, 24197 (2024). https://doi.org/10.1038/s41598-024-75521-y

A recent study explored the production of Terra Preta (TP), a highly fertile soil type, by replicating its formation in Ghanaian and Zambian soils. The experiment used biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More (derived from rice husks and charcoalCharcoal is a black, brittle, and porous material produced by heating wood or other organic substances in a low-oxygen environment. It is primarily used as a fuel source for cooking and heating.   More), alongside organic materials like kitchen waste, animal manure, and wood ashAsh is the non-combustible inorganic residue that remains after organic matter, like wood or biomass, is completely burned. It consists mainly of minerals and is different from biochar, which is produced through incomplete combustion.   Ash Ash is the residue that remains after the complete More, under controlled conditions for nine months.

The results showed significant improvements in key soil properties. The addition of biochar and organic residues increased soil pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More by up to 2.9 units, bringing it into the neutral-to-alkaline range. Cation exchange capacity (CEC), a crucial measure of soil fertility, increased by 2.5 to 8.2 times compared to original soil values. Similarly, essential nutrients like potassium (K), calcium (Ca), magnesium (Mg), and sodium (Na) increased significantly, boosting base saturation levels to 93-96%. These changes suggest improved soil structure and nutrient availability, which are vital for long-term agricultural productivity.

The study underscores the potential for TP formation beyond the Amazon Basin, using locally available materials. By applying this technique in tropical regions like Ghana and Zambia, sustainable soil management could become more accessible, promoting higher crop yields, carbon sequestration, and improved waste management.

Further research is needed to refine the process for different soil types and climatic conditions, but this study demonstrates the promise of TP as a tool for enhancing soil resilience and agricultural sustainability.