Surface spectroscopy of oxisols, entisols and inceptisol and relationships with selected soil properties - Poppiel, Raúl Roberto; Lacerda, Marilusa P. C; Oliveira Junior, Manuel Pereira de; Demattê, José Alexandre Melo; Romero, Danilo Jefferson; Sato, Marcus Vinicius; Almeida Júnior, Leonardo Rafael de; Cassol, Luiz Felipe Moreira (Revista Brasileira de Ciência do Solo, 2018)