FARMER KNOWLEDGE AND VALIDATION IN DIGITAL SOIL MAPPING: A SYSTEMATIC REVIEW (2013–2025) WITH EMPHASIS ON SUB-SAHARAN AFRICA AND COMPARATIVE REGIONS. FUDMA Journal of Earth and Environmental Sciences, [S. l.], v. 3, n. 1, p. 70–84, 2026. DOI: 10/3303/jees.2026.0301/026. Disponível em: https://jees.fudutsinma.edu.ng/index.php/jees/article/view/108. Acesso em: 26 jun. 2026.