Probable causes of hardening of redoximorphic features in Plinthosols of the Araguaia River floodplain, Central region of Brazil - Santos, Djavan Pinheiro; Santos, Glenio Guimarães; Oliveira, Virlei Álvaro de; Silva, Gustavo Cassiano da; Flores, Rilner Alves; Azevedo, Antônio Carlos; Souza Júnior, Valdomiro Severino de; Pereira, Marcos Gervasio (Geoderma Regional, 2022)