Evaluating the synergy of three soil spectrometers for improving the prediction and mapping of soil properties in a high anthropic management area: A case of study from Southeast Brazil - Fontenelli, Julyane V; Adamchuk, Viacheslav I; Ferreira, Marcia M. C; Amaral, Lucas R; Guimarães, Clécia Cristina Barbosa; Demattê, Jose Alexandre Melo; Magalhães, Paulo S. G (Geoderma, 2021)