Reversibility of the Hardening Process of Plinthite and Petroplinthite in Soils of the Araguaia River Floodplain under Different Treatments

AUTOR(ES)

Martins, Angélica Pires Batista, Santos, Glenio Guimarães, Oliveira, Virlei Álvaro de, Maranhão, Deyvid Diego Carvalho, Collier, Leonardo Santos

FONTE

Rev. Bras. Ciênc. Solo

DATA DE PUBLICAÇÃO

02/07/2018

RESUMO

ABSTRACT Although ferruginous materials occur frequently in soils of tropical regions, information about the reversal of the hardening process of these materials is scarce. This study assessed the influence of different chemical treatments and periods of immersion on the reversibility of the hardening process of plinthite and petroplinthite in soils of the Araguaia River plain. Soil samples were collected from the plinthic horizons in 0.10 m high and 0.15 m diameter PVC cylinders and divided into subsamples with a rock hammer. Homogeneous petroplinthite samples were also collected and broken into subsamples with a rock hammer. The plinthite and petroplinthite subsamples were subjected to five immersion treatments: distilled water, calcium carbonate solution, sodium hydroxide solution, sodium hydroxide solution + sodium hexametaphosphate, and acidic solution. The subsamples were immersed for 20, 40, 80, and 160 days. The dispersion and stability degrees and compressive strength in these subsamples were assessed. The wet aggregate stability test indicated no impact on the structural stability of plinthite and petroplinthite subsamples subjected to the treatment with different chemical agents, demonstrating the non-reversibility of the hardening process of these materials of the Araguaia River floodplain, under the studied conditions.

Documentos Relacionados

• Hardening and Stability of Plinthic Materials of the Araguaia River Floodplain under Different Drying Treatments
• Caloric density of aquatic macrophytes in different environments of the Baía river subsystem, upper Paraná river floodplain, Brazil
• Fish larvae assemblages in two floodplain lakes with different degrees of connection to the Paraná River, Brazil
• The conservation management of the giant amazon river turtles in the medium Araguaia river
• Bacterial strains from floodplain soils perform different plant-growth promoting processes and enhance cowpea growth