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SOIL An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/soil-2018-3
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Original research article
19 Feb 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal SOIL (SOIL).
Physical, chemical and mineralogical attributes of a representative group of soils from the Eastern Amazon, Brazil
Edna Santos de Souza1, Antonio Rodrigues Fernandes1, Anderson Martins de Souza Braz2, Fábio Júnior de Oliveira1, Luís Reynaldo Ferracciú Alleoni3, and Milton César Costa Campos4 1Institute of Agricultural Sciences, Federal Rural University of Amazon (ICA-UFRA), C. P. 917, Belém 66077-530, PA, Brazil
2Professor of Geosciences Area, Federal Rural University of Amazon (UFRA), Capanema 68700-030, PA, Brazil
3Department of Soil Science, College of Agriculture Luiz Queiroz, University of São Paulo (USP), C. P. 9, Piracicaba, SP, Brazil
4Institute of Education, Agriculture and Environment, Federal University of Amazonas, (UFAM) C. P. 786, Humaitá, AM, Brazil
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 particle size, fertility, silicon (Si) extracted by sodium hydroxide (NaOH), and iron (Fe), aluminum (Al), and manganese (Mn) extracted by sulfuric acid (H2SO4), sodium dithionite-citrate-bicarbonate and ammonium oxalate + oxalic acid. Descriptive analysis, multivariate principal component analysis and cluster analysis were carried out. The soils had low concentrations of bioavailable P, Ca2+, Mg2+ and K+ and high concentrations of Al3+ and Si and Al oxide contents were higher in Cambisols. Contents of Fe and Mn oxides were higher in both Cambisols and Nitosols, which are rich in oxidic minerals. Multivariate analysis indicated an association between the content of organic carbon and the pH, P, Ca, Mg and K contents. An additional association was observed between clay, potential acidity and the Fe and Al oxide contents.
Citation: Souza, E. S. D., Fernandes, A. R., Braz, A. M. D. S., Oliveira, F. J. D., Alleoni, L. R. F., and Campos, M. C. C.: Physical, chemical and mineralogical attributes of a representative group of soils from the Eastern Amazon, Brazil, SOIL Discuss., https://doi.org/10.5194/soil-2018-3, in review, 2018.
Edna Santos de Souza et al.
Edna Santos de Souza et al.
Edna Santos de Souza et al.

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Short summary
The study refers to a survey of the attributes of the main soils classes of the state of Pará, Eastern Brazilian Amazon. These soils have a good potential for agricultural use under natural conditions. In the study we observed that the soils are predominantely kaolinitic, but have relatively low aluminum and organic matter contents, with huge textural variability. The results enable a better understanding of Eastern Amazonian soils, whose extention reaches more than 1.2 million km2.
The study refers to a survey of the attributes of the main soils classes of the state of Pará,...
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