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The Cerrado Region on the Central Plateau of Brazil contains some of the oldest soils on Earth, with some soils weathering in place since the late Cretaceous. The region is currently undergoing rapid agriculturalization and industrialization. The objectives of this paper are: (1) to inventory the native trace element contents of pristine Cerrado soils, and (2) to better understand which trace elements...
A thorough understanding of major and trace element geochemistry is important in assessing the impacts of rapid agriculturalization and increased human occupation of the Cerrado region of central Brazil, a region with some of the oldest soils on Earth. The objectives of this paper are to summarize the major element composition of Cerrado soils in the context of their morphology and geomorphology,...
The ''Terra Preta de Indio'' (Indian black earth) or Terra Preta of Western Amazonia is a thick, dark-coloured, anthropic epipedon, usually rich in nutrients. It occurs mostly at the fringes of the Terra Firme, along the Amazon river banks, overlying deep strongly weathered soils. We studied selected chemical, physical and mineralogical properties of seven soils, ranging from the Tertiary Plateau...
Long-term (5- and 9-year) effects were evaluated of two tillage regimes (conventional tillage: CT; and no-tillage: NT) and two cropping systems (oat/maize: O/M; and oat+vetch/maize+cowpea: O+V/M+C) on characteristics of humic acids (HAs) from surface layer (0 to 25 mm) of a subtropical Brazilian Paleudult soil. Generally, soil HA samples from conservation management systems with no soil disturbance...
Nine soil profiles of a typical toposequence under primary rain forest of the Amazon area were investigated, distinguishing between Geric Ferralsols (Xanthic Kandiudox) in the upper and middle parts of the slope and Geri-Haplic Arenosols (Oxyaquic Quartzipsamments) in the lower ones. Generally, the soils are strongly acid with very high Al contents and show extremely low nutrient contents. In spite...
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