Comparative analysis of archival data on yields of main field crops from fertilizer experiments on different soil types in Bulgaria. Bulgarian Journal of Crop Science, [S. l.], v. 61, n. 1, p. 75–86, 2024. DOI: 10.61308/CPCB1076. Disponível em: https://agriacad.eu/ojs/index.php/bjcs/article/view/828.. Acesso em: 21 jan. 2026.