Physical, chemical, and mineralogical attributes of a representative group of soils from the eastern Amazon region in Brazil

Abstract

Abstract. Amazonian soils are heterogeneous. However, few studies have been carried out in the Amazon, mainly because of its considerable size, which complicates the collection of data and the ability to plan for the sustainable use of natural resources. In this study, the physical, chemical, and mineralogical attributes of soils in the state of Pará, Brazil, were characterized by examining the particle size, fertility, silicon extracted by sodium hydroxide, iron, and aluminum, and manganese extracted by sulfuric acid, sodium citrate-bicarbonate-dithionite, and ammonium oxalate + oxalic acid. A descriptive analysis, multivariate principal component analysis, and cluster analysis were performed. The soils had low concentrations of bioavailable P, Ca2+, Mg2+, and K and had high concentrations of Al3+, Si, and Al oxide in the Cambisols. Concentrations of Fe and Mn oxides were higher in both the Cambisols and Nitosols, which are rich in oxidic minerals. The multivariate analysis indicated an association between the organic carbon content and pH, P, Ca, Mg, and K concentrations. An additional association was observed between clay, potential acidity, and the Fe and Al oxide concentrations.

A soil quality index for seven productive landscapes in the Andean‐Amazonian foothills of Ecuador

“…The diversity of the Amazon ecosystem and studies relating to soils in this region should be considered during the application of techniques that can prevent the exploitation of unsustainable natural resources. Information relating to soil attributes can serve as a basis for public policies that target agricultural planning and technologies that increase land-use efficiency and conserve biodiversity (De Souza et al, 2018).…”

Efeito Da Poda Radicular E Do Hidrogel No Crescimento De Mudas De Jatobá

“…A paisagem natural apresenta predominância da Floresta Equatorial Latifoliada. No estado do Pará, 74% dos solos são representados por Latossolos e Argissolos (SOUZA et al, 2018). Os frutos coletados foram devidamente limpos, despolpados e as sementes extraídas acondicionadas em sacos plásticos e mantidos à temperatura ambiente por 20 dias até a semeadura.…”

A soil quality index for seven productive landscapes in the Andean-Amazonian foothills of Ecuador

“…One approach to the prevention of deforestation and soil degradation is to use management and conservation techniques that are appropriate in this region and these methods depend on the knowledge of soil attributes The diversity of the Amazon ecosystem and studies relating to soils in this region should be considered during the application of techniques that can prevent the exploitation of unsustainable natural resources. Information relating to soil attributes can serve as a basis for public policies that target agricultural planning and technologies that increase land use efficiency and conserve biodiversity (de Souza et al, 2018).…”