FERRAZ, G. A. E S.; SILVA, F. M. DA; OLIVEIRA, M. S. DE; SILVA, F. C. DA; CARVALHO, L. C. C. Comparison between the soil chemical atributes sampled conventionaly and in grid. Coffee Science - ISSN 1984-3909, v. 12, n. 1, p. 17 - 29, 30 Mar. 2017.