Little is known about chemical and mineralogical attributes of soils from the upper Amazon, compared with well-studied soils from the middle and lower Amazon. In the well-drained uplands of Upper Amazon, due to the Andes Cordillera proximity, soils are expected to be chemically richer. This work aimed to increase the knowledge of soils from the upper Amazon, by means of studying three soils along a typical topossequence at Benjamin Constant, near the Brazilian-Peruvian Border. These soils range from the uplands, […]