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