Soil created centuries ago by Indigenous peoples in the Amazon could help speed up recovery of degraded lands, changing the way ecological restoration is approached in Brazil. A study conducted by researchers from the University of São Paulo’s Center for Nuclear Energy in Agriculture (CENA-USP), Brazilian Agricultural Research Corporation (Embrapa) Western Amazon, and the National Institute of Amazonian Research (INPA) found that small amounts of Amazonian dark earth (ADE) significantly increased native tree growth under real field conditions. The results, published in January 2026 in the academic journal Springer Nature, caught experts’ attention especially regarding Handroanthus avellanedae, locally known as pink ipê, a species found in both the Amazon and the Atlantic Forest. After just 180 days, seedlings grown with modest amounts of ADE were up to 55% taller and 88% larger in stem diameter than those grown without the anthropogenic soil — that is, soil resulting from human action, the study found. Findings were also notable for paricá (Schizolobium amazonicum), another Amazonian species widely used in reforestation and also in the timber industry due to its fast growth. On average, they grew 20% more and had stems that were 15% larger in diameter. Professor Tsai Siu Mui, one of the study’s co-authors, stands between trees cultivated with Amazonian dark earth (left) and without that dark soil (right) after six months of experimentation. Image courtesy of Tsai Siu Mui. The study underscores the scientific potential of Amazonian dark earth, also known as “Indigenous dark earth.” It is an extremely fertile, organic-rich dark…This article was originally published on Mongabay

From Conservation news via This RSS Feed.