A study conducted in the Brazilian state of Amazonas has demonstrated that small amounts of Amazonian dark earth (ADE)—an anthropogenic soil created by ancient Amazonian populations—can increase the height and diameter of the pink trumpet tree (Handroanthus avellanedae) by up to 55% and 88%, res pectively. This tree also occurs in the Atlantic Forest. The research is published in the journal BMC Ecology and Evolution. ...read more read less