Effect of X-Ray Tube Configuration on Measurement of Key Soil Fertility Attributes with XRF - Tavares, Tiago Rodrigues; Molin, Jose Paulo; Nunes, Lidiane Cristina; Alves, Elton Eduardo Novais; Melquiades, Fabio L; Carvalho, Hudson Wallace Pereira de; Mouazen, Abdul Mounem (Remote Sensing, 2020)